U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Report 2009–5255

Prepared in cooperation with the Oklahoma Department of Transportation

StreamStats in Oklahoma—Drainage-Basin Characteristics 

and Peak-Flow Frequency Statistics for Ungaged Streams
On the cover: User interface for the Oklahoma StreamStats web applicaton.
Publishing support provided by:

Lafayette Publishing Service Center

For more information concerning this publication, contact

Director, USGS Oklahoma Water Science Center

202 NW 66th St., Bldg. 7

Oklahoma City, OK 73116

(405) 810-4400

Or visit the Oklahoma Water Science Center Web site at:

http://ok.water.usgs.gov
StreamStats in Oklahoma—DrainageBasin Characteristics and Peak-Flow 

Frequency Statistics for Ungaged Streams

By S. Jerrod Smith and Rachel A. Esralew

Prepared in cooperation with the Oklahoma Department of Transportation

Scientific Investigations Report 2009–5255

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2010

This and other USGS information products are available at http://store.usgs.gov/

U.S. Geological Survey

Box 25286, Denver Federal Center

Denver, CO 80225

To learn about the USGS and its information products visit http://www.usgs.gov/

1-888-ASK-USGS

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the 

U.S. Government.

Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

Smith, S.J., and Esralew, R.A., 2010, StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams: U.S. Geological Survey Scientific Investigations Report 2009–5255, 59 p.
iii

Contents

Abstract ...........................................................................................................................................................1

Introduction ....................................................................................................................................................1

Purpose and Scope ..............................................................................................................................5

Acknowledgments ...............................................................................................................................6

Data Processing Methods ............................................................................................................................6

Computing Drainage-Basin Characteristics .............................................................................................9

Contributing Drainage Area (CONTDA) .............................................................................................9

Contributing Drainage Area That Is Unregulated by Natural Resources Conservation 

Service Floodwater Retarding Structures (DAUNREG) ....................................................9

Mean-Annual Precipitation at Drainage-Basin Outlet (PRCOUT61) ..........................................10

10-85 Channel Slope (CSL10_85fm) ..................................................................................................10

Percent Impervious Area (IMPNLCD01) .........................................................................................13

Computing Peak-Flow Frequency Statistics ...........................................................................................13

Rural, Unregulated Streams ..............................................................................................................13

Rural, Natural Resources Conservation Service Floodwater Retarding StructureRegulated Streams ................................................................................................................15

Urban Adjustment ...............................................................................................................................15

Accuracy and Limitations ...........................................................................................................................15

Regression Accuracy ........................................................................................................................16

Scope of Valid Application ................................................................................................................17

Comparison of Basin Characteristics Computed by Using Manual and Automated 

Techniques .............................................................................................................................17

Comparison of Peak-Flow Frequency Statistics Computed by Using Manual and 

Automated Computations of Basin Characteristics ........................................................18

Summary........................................................................................................................................................18

References Cited..........................................................................................................................................22

Appendix........................................................................................................................................................25

 1. Basin characteristics computed by Tortorelli and StreamStats.. .......................................26

 2. Peak-flow frequency statistics estimated by using basin characteristics from 

Tortorelli and StreamStats. ......................................................................................................44

Figures

1–2. Maps showing:

1. Processed hydrologic units (HUs) for the Oklahoma StreamStats applications. ..............3

2. Processed hydrologic units and unprocessed areas for the Oklahoma StreamStats

application, showing noncontributing areas and large rivers that are unavailable for 

computation of streamflow statistics........................................................................................4

3. Flow chart illustrating the development and application of peak-flow regression

equations in StreamStats. ...........................................................................................................5

4–8. Maps showing:
iv

 4. Elevation (National Elevation Dataset) across the Oklahoma StreamStats processed 

Tables

1. Description of basin characteristics used in the Oklahoma StreamStats

application. .................................................................................................................................10

2. R-squared and standard error of regression equations for unregulated streams..........17

3. Ranges of validity for basin characteristics (independent variables) used in 

computation of peak-flow frequency statistics in Oklahoma..............................................18
v

Conversion Factors

Multiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)

inch (in.) 25.4 millimeter (mm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Area

square mile (mi2) 259.0 hectare (ha)

square mile (mi2) 2.590 square kilometer (km2) 

Flow rate

cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)

Hydraulic gradient

foot per mile (ft/mi) 0.1894 meter per kilometer (m/km)

Multiply By To obtain

Length

meter (m) 3.281 foot (ft) 

kilometer (km) 0.6214 mile (mi)

Area

square kilometer (km2) 247.1 acre

square kilometer (km2) 0.3861 square mile (mi2)

Vertical coordinate information is referenced to the North American Vertical Datum of 1988 

(NAVD 88).

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).
vi
Abstract

The USGS Streamflow Statistics (StreamStats) Program 

was created to make geographic information systems-based 

estimation of streamflow statistics easier, faster, and more 

consistent than previously used manual techniques. The 

StreamStats user interface is a map-based internet application 

that allows users to easily obtain streamflow statistics, basin 

characteristics, and other information for user-selected U.S. 

Geological Survey data-collection stations and ungaged sites 

of interest. The application relies on the data collected at U.S. 

Geological Survey streamflow-gaging stations, computer aided 

computations of drainage-basin characteristics, and published 

regression equations for several geographic regions comprising the United States. The StreamStats application interface allows the user to (1) obtain information on features in selected 

map layers, (2) delineate drainage basins for ungaged sites, (3) 

download drainage-basin polygons to a shapefile, (4) compute 

selected basin characteristics for delineated drainage basins, 

(5) estimate selected streamflow statistics for ungaged points 

on a stream, (6) print map views, (7) retrieve information for 

U.S. Geological Survey streamflow-gaging stations, and (8) 

get help on using StreamStats.

StreamStats was designed for national application, with 

each state, territory, or group of states responsible for creating 

unique geospatial datasets and regression equations to compute selected streamflow statistics. With the cooperation of 

the Oklahoma Department of Transportation, StreamStats has 

been implemented for Oklahoma and is available at 

http://water.usgs.gov/osw/streamstats/. 

The Oklahoma StreamStats application covers 69 

processed hydrologic units and most of the state of Oklahoma. Basin characteristics available for computation include 

contributing drainage area, contributing drainage area that 

is unregulated by Natural Resources Conservation Service 

floodwater retarding structures, mean-annual precipitation at 

the drainage-basin outlet for the period 1961–1990, 10–85 

channel slope (slope between points located at 10 percent and 

85 percent of the longest flow-path length upstream from the 

outlet), and percent impervious area. The Oklahoma StreamStats application interacts with the National Streamflow 

Statistics database, which contains the peak-flow regression 

equations in a previously published report. Fourteen peak-flow 

(flood) frequency statistics are available for computation in the 

Oklahoma StreamStats application. These statistics include the 

peak flow at 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals for rural, unregulated streams; and the peak 

flow at 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals for rural streams that are regulated by Natural Resources Conservation Service floodwater retarding structures. Basin 

characteristics and streamflow statistics cannot be computed 

for locations in playa basins (mostly in the Oklahoma Panhandle) and along main stems of the largest river systems in 

the state, namely the Arkansas, Canadian, Cimarron, Neosho, 

Red, and Verdigris Rivers, because parts of the drainage areas 

extend outside of the processed hydrologic units.

Introduction 

Planning, permitting, design, and operation of hydraulic 

structures (such as dams, bridges, and culverts) depend on reliable and accurate estimates of streamflow statistics, especially 

peak-flow frequency statistics. The U.S. Geological Survey 

(USGS) periodically publishes these streamflow statistics 

for gaged sites in and near Oklahoma with long-term record 

(Tortorelli, 2002; Lewis and Esralew, 2009). Regionalized 

regression methods have been used in Oklahoma to estimate 

peak-flow (flood) frequency statistics at ungaged sites as a 

function of measured physical and climatic drainage-basin 

characteristics (Tortorelli, 1997).

The USGS Streamflow Statistics (StreamStats) Program 

was created cooperatively by the USGS and Environmental 

Systems Research Institute, Inc. (ESRI) (2007, 

StreamStats in Oklahoma—Drainage-Basin 

Characteristics and Peak-Flow Frequency Statistics for 

Ungaged Streams

By S. Jerrod Smith and Rachel A. Esralew
2 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

http://www.esri.com), to make geographic information systems 

(GIS)-based estimation of streamflow statistics easier, faster, 

and more consistent than previously used manual techniques 

(Koltun and others, 2006). Prior to the development of computerized GIS techniques, drainage-basin characteristics were 

measured or computed from paper maps. The measurement 

of drainage-basin characteristics by manual methods was 

time consuming, inconsistent, and can be prone to error. The 

precision of estimates for some drainage-basin characteristics, 

such as contributing drainage area and channel slope, varied 

with the basin size and the map scale used. In addition, some 

manual computations of these characteristics took hours to 

days for large basins. GIS techniques can be used to compute 

drainage-basin characteristics in seconds, with greater accuracy and reproducibility than manual techniques.

The StreamStats user interface is a map-based internet 

application that allows users to easily obtain streamflow 

statistics, basin characteristics, and other information for userselected USGS streamflow-gaging stations and ungaged sites 

of interest (Ries and others, 2004; Ries and others, 2008). The 

application relies on the data collected at USGS streamflowgaging stations, computer aided computations of drainagebasin characteristics, and published regression equations for 

several geographic regions comprising the United States. The 

StreamStats application interface allows the user to (1) obtain 

information on map layer features, (2) delineate drainage basins for ungaged sites, (3) download drainage-basin polygons 

to a shapefile, (4) compute selected basin characteristics for 

delineated drainage basins, (5) estimate selected streamflow 

statistics for ungaged points on a stream, (6) print map views, 

(7) retrieve information for USGS streamflow-gaging stations, 

including published streamflow statistics at stations with longterm streamflow data, and (8) get help on using StreamStats 

(Ries and others, 2004; Ries and others, 2008).

The USGS StreamStats Program was designed for 

national application, with each state, territory, or group of 

states responsible for creating unique geospatial datasets and 

regression equations to compute streamflow statistics. With the 

cooperation of the Oklahoma Department of Transportation, 

StreamStats has now been implemented for Oklahoma and is 

available at http://water.usgs.gov/osw/streamstats/. The primary purpose of the Oklahoma StreamStats application in the 

initial version is to provide estimates of drainage-basin characteristics and peak-flow frequency statistics for user-selected 

ungaged sites on Oklahoma streams. Basin characteristics and 

peak-flow frequency statistics are used by hydrologic scientists and engineers to appropriately design structures such as 

roads, dams, culverts, bridges, and levees, which interact with 

waterways. Estimates of basin characteristics and streamflow 

statistics also should be useful to water-resource managers, 

developers, and conservationists in daily planning activities. 

The Oklahoma StreamStats application covers 69 

processed hydrologic units (HUs) and most of the state of 

Oklahoma (fig. 1). Basin characteristics available for computation include contributing drainage area, contributing drainage 

area that is unregulated by Natural Resources Conservation 

Service (NRCS) floodwater retarding (FWR) structures, 

mean-annual precipitation at the drainage-basin outlet for the 

period 1961–1990, 10–85 channel slope (slope between points 

located at 10 percent and 85 percent of the longest flow-path 

length upstream from the outlet), and percent impervious area. 

Basin characteristics are valid only for drainage basins entirely 

in the processed area (fig. 2). Basin characteristics and streamflow statistics cannot be computed for locations in noncontributing areas (such as playa basins in the Oklahoma Panhandle) 

and along main stems of the largest river systems in the state, 

namely the Arkansas, Canadian, Cimarron, Neosho, Red, and 

Verdigris Rivers, because parts of the drainage basins extend 

outside of the processed hydrologic units (HUs) (fig. 2).

StreamStats uses a regionalized regression method to 

estimate streamflow statistics at ungaged sites. The regionalized regression method uses physical and climatic drainagebasin characteristics and streamflow data for gaged basins 

to construct regression equations relating selected basin 

characteristics to selected streamflow statistics. Multiple 

drainage-basin characteristics, such as contributing drainage 

area, mean-annual precipitation, and channel slope, are used 

as independent variables in the regression equation to estimate 

each streamflow statistic (dependent variable). The regression equations, created at gaged locations, then can be used to 

estimate streamflow statistics at ungaged stream locations in 

similar physical and climatic settings.

The multiple-linear regression equation takes the general 

form:

Yi = 10 bo *( X1

b1)*( X2b2)...( Xnbn)*10 εi (1) 

where

Yi is the value of the dependent variable, or 

streamflow statistic, for station i, 

X1 to Xn are the n independent variables, or series of 

drainage-basin characteristics, bo to bn are the n+1 regression-model coefficients, and εi is the residual error (difference between 

the observed and estimated values of the 

dependent variables). 

In regression analysis, a least-squares method can be used 

to estimate the regression-model coefficients. The coefficients 

are determined after minimizing the sum of the squared differences, or errors, of the measured and estimated data points. 

Each set of basin characteristics is selected to give the best 

estimate for each streamflow statistic and represent the unique 

landscape and hydrologic conditions of the region or state for 

which the regression equation was created.

The basic procedure for regression equation development and application in StreamStats is presented in figure 3. 

First, streamflow-gaging stations (gages) with sufficiently 

long streamflow record (typically 10 or more years) are 

identified, and selected basin characteristics are computed at 

each gage. Next, streamflow statistics are computed for the 

period of record at each gage. The most statistically significant independent variables (basin characteristics) are selected 
Introduction 

3

Albers Equal-Area Conic ProjectionNorth American Datum 1983

KANSAS

TEXAS

ARKANSAS

MISSOURI COLORADO

NEW

MEXICO

EXPLANATION

100° W

36° N

97° W

94° W 103° W

34° N

Processed Hydrologic Unit (HU) with 8-digit identification codeState boundaryStream

11130302

11050002

11100101

11070207

11100303

11130303

11050001

11130201

11060004

11070209

11060006

11070106

11090201

11140109

11060005

11140101

11100103

11090204

11110105

11100104

11100302

11100301

11040008

11140105

11090202

11110104

11100201

11040006

11110103

11120302

11040001 11040002

11070103

11130301

11140106

11120105

11140103

11040007

11140107

11070205

11120303

11050003

11100102

11110101

11130101

11060003

11120202

11120301

11070107

11130203

11100203

11060002

11070208

11140104

11130210

11090203

11060001

11120304

11130208

11140108

11100202

11110102

11130202

11130102

11120201

11140102

11070206

11130304

11070105

0 5025 MILES0 50 KILOMETERS

Figure1. Processed hydrologic units (HUs) for the Oklahoma StreamStats applications.
4 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams Drainage basin boundaries from Watershed Boundary Dataset Albers Equal-Area Conic Projection North American Datum 1983 KANSAS TEXAS

ARKANSAS

MISSOURI

COLORADO

NEW MEXICO

100° W

36° N

97° W

94° W

103° W

106° W

38° N

34° N

Canadian

River

River

Red

River

Cimarron

Neosho

Verdigris

Arkansas

River

River River

EXPLANATION

Unprocessed areaProcessed Hydrologic Unit (HU)Noncontributing areaArkansas-Red basin divideState boundaryStreamUnavailable streams

0 50 100 25 MILES0 100 50 KILOMETERS

LakeTexoma

CumberlandLevee

Figure 2. Processed hydrologic units and unprocessed areas for the Oklahoma StreamStats application, showing noncontributing areas and large rivers that are unavailable for computation of streamflow statistics.
Introduction 5

for multivariate regression with each streamflow statistic 

by using sensitivity analysis and tests of collinearity. These 

multivariate regression equations are applied to ungaged sites 

in the StreamStats web application. When the StreamStats 

user clicks on an ungaged location on a stream, StreamStats 

delineates the contributing drainage basin. The application 

computes selected basin characteristics and applies selected 

regression equations to compute the user-requested streamflow

statistics with a 90-percent confidence interval. The computed 

basin characteristics and flow statistics for the ungaged site are

reported to the user.

Tortorelli (1997) created statewide regression equations 

for Oklahoma to estimate peak-flow frequency statistics for 

selected recurrence intervals (2, 5, 10, 25, 50, 100, and 500 

years). Significant independent variables required to estimate 

peak-flow frequency statistics for rural unregulated streams in 

Oklahoma are (1) contributing drainage area, (2) mean-annual 

precipitation for the period 1961–1990 at the drainage-basin 

outlet1

, and (3) 10–85 channel slope (Tortorelli, 1997). The 

regression equations are intended for use in rural, unregulated 

1

 Area-weighted mean-annual precipitation did not substantially increase the 

accuracy of the regression equations (Tortorelli, 1997).

drainage basins and rural drainage basins that are regulated by 

NRCS FWR structures. The Tortorelli (1997) regression equations were not intended for use in heavily urbanized drainage basins or drainage basins with other types of streamflow 

regulation. However, Tortorelli (1997) provided a method for 

adjusting peak-flow frequency statistics for some urbanization 

effects. For ungaged sites on urban streams, an urban adjustment of the statewide regression equations for rural streams 

can be used to estimate peak-flow frequency statistics. This urban adjustment is not applied by the StreamStats application; 

proper application of the urban adjustment is the responsibility 

of the StreamStats user. 

Purpose and Scope

The primary purpose of this report is to document the 

incorporation of procedures for estimating selected drainagebasin characteristics and peak-flow frequency statistics for 

ungaged streams from Tortorelli (1997) into the StreamStats 

application. The peak-flow estimation procedures created into 

the Oklahoma StreamStats application are optimized for rural, 

unregulated drainage basins entirely in Oklahoma and with 

At gaged locations At ungaged locations

(in StreamStats web

application)

Selection of appropriate gages User-defined site selection 

and basin delineation and basin delineation

Computation of drainage- Computation of drainagebasin characteristics basin characteristics

Computation of desired flow Application of regression to 

statistics for period of record compute desired flow statistics

Development of multivariate Reporting of desired

regressions for flow statistics flow statistics

Figure 3. Flow chart illustrating the development and application of peak-flow regression equations in StreamStats.
6 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

less than 2,510 square miles (mi2) of contributing drainage 

area. The peak-flow estimation procedures also can be used 

in basins regulated by small NRCS FWR structures with the 

understanding that results may be less accurate in those settings. This report also describes the development, functionality, and limitations of the USGS StreamStats application for 

Oklahoma, and a procedure for adjusting estimated peak-flow 

frequency statistics for urbanization effects.

Acknowledgments 

Christine Dartiguenave, Environmental Systems Research Institute, Inc., provided software support and solutions 

throughout the project. The contributions of Jim Henley, 

Natural Resources Conservation Service, and Mike Sughru, 

Oklahoma Water Resources Board, were valuable in the 

production and refinement of digital datasets that incorporated 

dam locations in the state of Oklahoma. 

The authors appreciate the efforts of Seth Tribbey, formerly of the U.S. Geological Survey, and Jason R. Masoner, 

U.S. Geological Survey, who assisted with data processing. The authors also greatly appreciate the help of Alan H. 

Rea and Kenneth D. Skinner, U.S. Geological Survey, who 

provided technical support and solutions to many problems 

throughout the project.

Data Processing Methods

A large part of the effort involved in implementing 

StreamStats surrounds creating, quality assuring, and processing geospatial datasets required to compute the independent 

variables (basin characteristics) used in regression equations 

(Koltun and others, 2006). Several publicly available national geospatial datasets were integrated, by using a process 

described by Rea and Skinner (2009), to compile a hydrologically correct topographic representation of the Oklahoma landscape. These national datasets included the USGS National 

Elevation Dataset (NED; U.S. Geological Survey, 2006), the 

Natural Resources Conservation Service (NRCS) Watershed 

Boundary Dataset (WBD; Natural Resources Conservation 

Service, 2006), and the USGS National Hydrography Dataset 

(NHD; U.S. Geological Survey, 2008) (fig. 4). Digital Elevation Models (DEMs) from the NED (fig. 4) are a combination 

of 10-meter (horizontal) resolution (where available) and 

resampled 30-meter resolution elevation data. Therefore, some 

areas of Oklahoma have better elevation control than others. Generally, the vertical accuracy of NED elevation data is 

about ± 7 to 15 meters (http:\seamless.usgs.gov\faq\ned_faq.

php).

Two high-resolution datasets were integrated with the 

NED to limit hydrologic errors that might result from the 

coarse vertical resolution of NED elevation data. High-resolution NHD streams were used to reinforce the stream drainage 

network onto the DEM. The NHD streams are generated from 

streams (blue lines) on USGS 7.5-minute, 1:24,000 scale 

topographic maps that, in some areas, have been updated from 

aerial photograph inspection. Likewise, the WBD drainage 

divides were used to reinforce ridgelines on the DEM. Some 

modification of the NHD (editing stream loops) and WBD 

lines (adding divides to represent dams that were not built 

when the elevation data were collected) was necessary to more 

accurately represent the catchment and drainage network. All 

modifications to the DEM were made over a 1:24,000-scale 

topographic map base with occasional aerial photo verification. Rea and Skinner (2009) provide a more detailed review 

of processing steps.

Some areas of Oklahoma posed challenges for accurate 

representation in the topographic model. Though the WBD 

contains subbasin units based on the 8-digit HUs of the USGS 

(fig. 1), some of the area in these units is likely noncontributing, and does not contribute runoff to the main stem of the HU 

(fig. 2). For example, western Oklahoma, Kansas, and Texas 

have numerous playa lakes that accumulate runoff during precipitation. Accumulated runoff is slowly released from these 

lakes by infiltration and evapotranspiration. These lakes do 

not, at least directly, contribute runoff to a stream. Therefore, 

noncontributing areas (fig. 2) were modeled in the StreamStats 

application by using drains (sinks) at playa lakes and large 

depressions (greater than about 0.16 square kilometer in area) 

to subtract drainage areas from the main stem drainage area. 

Noncontributing areas also are excluded during computation 

of basin characteristics. Playa lakes or large depressions accounted for all but one of the noncontributing areas modeled 

in the StreamStats application; a special case was made for the 

area (about 12 mi2) behind Cumberland levee on Lake Texoma 

in HU 11130304 (figs. 1–2). Areas behind manmade dams 

were not modeled as noncontributing areas because these features provide outlet works and spillways that can allow runoff 

to flow downstream.

The U.S. Army Corps of Engineers National Inventory of 

Dams (NID) dataset was modified to place NRCS FWR structures and other major Oklahoma dams (Oklahoma Water Resources Board, 2007) on the drainage network. These structure 

locations were verified by using National Agriculture Imagery 

Program (NAIP) 2003 or 2006 color aerial photography.

The processed areas of Oklahoma, Texas, Arkansas, 

Missouri, and Kansas contained 2,352 NRCS FWR structures 

when the StreamStats application for Oklahoma was designed 

(2007; fig. 5). Most of the FWR structures were constructed 

in the late 1950s and 1960s and about half are in the Washita 

River Basin (fig. 5). The FWR structures were constructed in 

small headwater catchments (as much as about 90 mi2 in contributing drainage area) and were intended to protect vulnerable basins from soil erosion and flooding. The structures were 

designed to temporarily impound storm runoff from small 

headwater catchments, and slowly release the impounded 

water through a drop-inlet spillway over a period of several 

days. If the design capacity of the FWR structures is exceeded 

during a storm, an uncontrolled emergency spillway releases 

the excess storm water. When several of these structures are 
Data Processing Methods

7

Albers Equal-Area Conic ProjectionNorth American Datum 1983

KANSAS

TEXAS

ARKANSAS

MISSOURI COLORADO

NEW

MEXICO

EXPLANATION

Hydrologic Unit (HU) boundaryState boundaryStream

100° W

36° N

97° W

94° W 103° W

34° N

8710230

Elevation, in feet

0 5025 MILES0 50 KILOMETERS

Figure 4. Elevation (National Elevation Dataset) across the Oklahoma StreamStats processed area showing selected streams from National Hydrography Dataset and selected hydrologic units from Watershed Boundary Dataset.
8 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams Figure 5. Location of Natural Resources Conservation Service floodwater retarding structures in processed areas and major dams in Oklahoma.
Computing Drainage-Basin Characteristics 9

constructed as part of a basin conservation and flood-control 

project, the net result is a delayed and reduced peak flow 

downstream. However, the efficiency of these structures during any given storm is dependent on the amount of available 

storage.

Contributing drainage area is calculated in the GIS by 

using a flow-accumulation grid, which is a raster in which 

the number in each cell is equal to the number of upstream or 

upgradient cells that flow into that cell. The automated flowaccumulation function requires input of a flow-direction grid, 

which describes the direction of flow from each cell to the 

next downstream cell. A weighted flow-accumulation function 

was used to create a grid describing NRCS FWR structureadjusted contributing drainage area. The function uses the 

same flow-direction grid, but allows weighted accounting 

of upstream or upgradient cells on the basis of a weight grid 

input. The weight grid used in calculation of NRCS FWR 

structure-adjusted contributing drainage area contained mostly 

zeroes (indicating that the cell was not to be counted), but cells 

representing NRCS FWR structures were assigned a number 

equal to the upstream contributing drainage area. Because 

some structures were nested within the drainage area of other 

structures, only non-nested areas were reflected in the weight 

grid to avoid double counting areas. The resulting weighted 

flow-accumulation grid contains cell values that represent the 

contributing drainage area that is regulated by (upstream from) 

NRCS FWR structures. To obtain the contributing drainage 

area that is unregulated by NRCS FWR structures, this grid 

was simply subtracted from the unweighted contributing 

drainage area grid.

Other datasets were added to the Oklahoma StreamStats 

application to allow computation of mean-annual precipitation 

at the drainage-basin outlet and percent impervious area over a 

drainage basin. Mean-annual precipitation data for the period 

1961–1990 were downloaded from the Oregon State University PRISM Climate Group as a 2-kilometer ASCII grid file 

(PRISM Climate Group, 2008). The impervious area NLCD 

data (2001) were downloaded from the Multi-Resolution Land 

Characteristics Consortium (2008) as a 30-meter grid. The 

precipitation and impervious land cover data were merged and 

clipped to the processed area (fig. 2) prior to inclusion into the 

StreamStats application.

Computing Drainage-Basin 

Characteristics

The Oklahoma StreamStats application was designed to 

automatically compute selected drainage-basin characteristics 

(table 1) that may influence peak-flow frequency statistics. 

These characteristics include contributing drainage area (in 

square miles) (CONTDA), mean-annual precipitation at the 

drainage-basin outlet for the period 1961–1990 (in inches) 

(PRCOUT61), and the 10–85 channel slope (in feet per mile 

(ft/mi)) (CSL10_85fm). Other states have recognized the 

utility of these particular characteristics in estimating peakflow frequency statistics by using the regionalized regression 

method. Peak-flow regression equations have been created for 

all 50 U.S. states and Puerto Rico; all 51 sets of regression 

equations use drainage area, 27 use channel slope, and 19 use 

mean-annual precipitation as independent variables in computations of peak-flow frequency statistics (Kernell Ries, USGS, 

written commun., 2002). 

Other drainage-basin characteristics available for computation in the Oklahoma StreamStats application include the 

contributing drainage area that is unregulated by NRCS FWR 

structures (DAUNREG), which can be used in the estimation 

of peak-flow statistics for streams regulated by NRCS FWR 

structures, and percent impervious area (IMPNLCD01), which 

can be used to determine if an urban adjustment of peak-flow 

frequency statistics is necessary.

Contributing Drainage Area (CONTDA)

Drainage basins can be defined by a point on a stream, 

the basin outlet, to which all areas in the drainage basin 

contribute runoff. The StreamStats application takes a user-defined outlet on a stream and identifies, or delineates, the drainage basin of the stream at that location. Contributing drainage 

area is a conservative estimate of the runoff contributing 

area, in square miles, upstream from the user-selected basin 

outlet. In reality, the runoff contributing area is dependent 

on the duration and intensity of precipitation, the antecedent 

soil moisture and depression storage, and the permeability of 

earth materials over a drainage basin. Modeling these factors 

is beyond the current scope and capability of the Oklahoma 

StreamStats application. 

The drainage-basin outlet and delineated drainage basin 

are used as the templates for estimating basin characteristics. 

StreamStats allows the user to download shapefiles of the 

drainage-basin outlet and the drainage-basin polygon with 

basin characteristics as attributes. 

Contributing Drainage Area That Is Unregulated 

by Natural Resources Conservation Service 

Floodwater Retarding Structures (DAUNREG)

Oklahoma has more than 2,100 NRCS-managed FWR 

structures that were built in small headwater catchments 

to protect vulnerable land from soil erosion and flooding. 

A system of upstream FWR structures in a drainage basin 

protects land by reducing the magnitude (and frequency) of 

floods downstream from the FWR structures. The amount of 

reduction is related to the percentage of the drainage basin that 

is regulated by (upstream from) FWR structures (Tortorelli, 

1997)

To illustrate the effectiveness of NRCS FWR structures 

in reducing peak flows, Oklahoma NRCS FWR structure-regulated peak-flow regression equations use an adjusted con-
10 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

tributing drainage area that excludes area regulated by FWR 

structures. The contributing drainage area that is unregulated 

by NRCS FWR structures (DAUNREG) is reported in units 

of square miles. Other basin characteristics used to estimate 

NRCS FWR structure-regulated peak-flow frequency statistics, such as 10–85 channel slope and percent impervious area, 

are estimated over the contributing drainage area (CONTDA), 

which includes areas regulated by NRCS FWR structures. 

Area regulated by NRCS FWR structures also is reported by 

the StreamStats application. This basin characteristic (NRCSPCT), reported as percent, is computed as the contributing 

drainage area regulated by NRCS FWR structures divided by 

the contributing drainage area, 

NRCSPCT = [(CONTDA – DAUNREG) / CONTDA]

where contributing drainage area (CONTDA) and contributing 

drainage area that is unregulated by NRCS FWR structures 

(DAUNREG) are in units of square miles. The data used 

to compute DAUNREG and NRCSPCT were current as of 

2006. The user should be aware that NRCS FWR structures 

constructed or removed since 2006 may not be represented in 

StreamStats. 

Mean-Annual Precipitation at Drainage-Basin 

Outlet (PRCOUT61)

Tortorelli (1997) found the mean-annual precipitation 

at the drainage-basin outlet (PRCOUT61) to be as useful as 

mean-annual area-weighted basin precipitation as an independent variable in peak-flow regressions. Mean-annual precipitation data for the period 1961 to 1990 (Daly and others, 1994; 

PRISM Climate Group, 2008) were used to define precipitation at the drainage-basin outlet. The computed mean-annual 

precipitation at the drainage-basin outlet is reported in units of 

inches (fig. 6).

10-85 Channel Slope (CSL10_85fm)

Channel slope can be computed in several ways. The 

Oklahoma StreamStats application computes channel slope by 

using the 10–85 channel slope method described in Tortorelli 

(1997). This method first identifies the longest flow path from 

the basin outlet to the drainage divide (fig. 7). The total length 

of this flow path (L) is measured from the outlet, and reference points are placed at locations that are 10 and 85 percent 

of the length of the flow path (fig. 7). The 10–85 channel slope 

Table 1. Description of basin characteristics used in the Oklahoma StreamStats application. 

[NED, National Elevation Dataset; NHD, National Hydrography Dataset; WBD, Watershed Boundary Dataset; PRISM, Parameter-Elevation Regressions on 

Independent Slopes Model; NRCS, Natural Resources Conservation Service; FWR, floodwater retarding]

Basin characteristic (identifier) Description Data Source

Contributing drainage area (CONTDA) Contributing drainage area, in square miles NED 10-meter resolution elevation data 

(http://seamless.usgs.gov/index.php), 

NHD (http://nhdgeo. usgs.gov/viewer.htm, 

accessed July 2006) and WBD (source: 

http://www.ncgc.nrcs.usda.gov/products/

datasets/watershed/, accessed July 2006)

NRCS FWR structure-unregulated contributing drainage area (DAUNREG)Contributing drainage area that is unregulated by NRCS FWR structures, in square 

miles

NED 10-meter resolution elevation data 

(http://seamless.usgs.gov/index.php), 

NHD (http://nhdgeo. usgs.gov/viewer.htm, 

accessed July 2006) and WBD (source: 

http://www.ncgc.nrcs.usda.gov/products/

datasets/watershed/ , accessed July 2006)

Percentage NRCS FWR structure-regulated 

contributing drainage area (NRCSPCT)

Contributing drainage area that is regulated 

by NRCS FWR structures, in percent

Derived; [(CONTDA – DAUNREG) / 

CONTDA]

10-85 channel slope (CSL10_85fm) Channel slope between points 10 percent and 

85 percent of the longest flow-path length 

measured from the basin outlet, in feet per 

mile

NED 10-meter resolution elevation data 

(http://seamless.usgs.gov/index.php), and 

high-resolution NHD (http://nhdgeo.usgs.

gov/viewer.htm, accessed July 2006) 

Mean-annual precipitation at basin outlet 

(PRCOUT61)

Mean-annual precipitation (1961-1990) at 

the basin outlet, in inches

1,600-meter resolution data layer created 

from PRISM dataset. Source: http://www.

prism.oregonstate.edu/, accessed July 

2008

Percent impervious area (IMPNLCD01) Percentage of basin surface area containing 

impervious cover

30-meter resolution data layer from the 

Multi-Resolution Land Characteristics 

Consortium, accessed August 2008.
Computing Drainage-Basin Characteristics

11

Figure 6. Mean-annual precipitation for the period 1961–1990 in processed area.

KANSAS

TEXAS

AR K ANSAS

MISSOURI COLORADO

NEW

MEXICO

EXPLANATION

Processed area boundaryState boundaryStream

100° W

36° N

97° W

94° W 103° W

34° N

Albers Equal-Area Conic ProjectionNorth American Datum 1983

2 0

24

2 8 3 6

3 2

4 0

48

4 8

5 2

4 4

4 0

3 6

3 2

2 0

2 4

2 8

2 0

16

16

16

16

2 0

71.6914.35

Mean-annual precipitation (1961-1990), in inches

Precipitation contour, in inches

0 5025 MILES0 50 KILOMETERS

48

60

52

44
12 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams EXPLANATION Drainage-basin divide Stream with flow direction Trace of the stream-channel length from outlet to the basin divide Drainage-basin outlet Stream points at 10 percent and 85 percent of longest flow-path length upstream from outlet Longest flow-path (channel) length, from outlet to basin divide, in miles 10-85 channel slope (slope between points at 10 percent and 85 percent of longest flow-path length upstream from outlet), in feet per mile Streambed elevation at 10 percent of longest flow-path length upstream from outlet Streambed elevation at 85 percent of longest flow-path length upstream from outlet

L

CSL10_85fm

ELEV0.10

ELEV0.85

90807060

150140130120

110

100

0 10 20 30 40 50 60 70 80 90 100

DISTANCE UPSTREAM FROM OUTLET, AS PERCENT OF TOTAL LENGTH

STREAMBED 

ELEVATION, IN FEETELEVATION PROFILE OF LONGEST FLOW PATH EXAMPLE CALCULATION ELEV - ELEV 0.85 0.10 0.85 L - 0.10 L CSL10_85fm = = 115 - 70 4.68 - 0.55 feet mile

= 

45

4.13

= 10.9 feet/mile

4.6 miles

0.10 L = 0.55 mile

ELEV = 70 feet 0.10

0.85 L = 4.68 miles

ELEV = 115 feet 0.85

L = 5.5 miles

LONGEST FLOW PATH

ELEV - 0.85ELEV0.10

0.75 L

0 0.55 1.10 1.65 2.20 2.75 3.30 3.85 4.40 4.95 5.50

DISTANCE UPSTREAM FROM OUTLET, IN MILES

Figure 7. Example computation of 10–85 channel slope in a hypothetical drainage basin (modified from Tortorelli, 1997).
Computing Peak-Flow Frequency Statistics 13

(CSL10_85fm) is then computed by dividing the difference 

in elevation (ΔELEV) between the two points by the stream 

length (0.75L) between the two points (fig. 7). The computed 

slope is reported in units of feet per mile. StreamStats allows 

the user to download shapefiles of the longest flow path and 

the 10 percent and 85 percent points used to compute the 10-

85 channel slope. 

The 10–85 channel slope is more sensitive to map scale 

effects than are other basin characteristics used in the estimation of Oklahoma peak-flow frequency statistics. When 10–85 

channel slope is computed from paper maps, the length of 

the longest flow path is usually underestimated. The estimation bias is a result of the loss of stream sinuosity (and stream 

length) that typically occurs at smaller (zoomed-out) ratio 

map scales (Mandelbrot, 1983). Tortorelli (1997) computed 

10-85 channel slopes by hand on paper maps ranging in scale 

from 1:24,000 to 1:250,000. The automated slope computation procedures used in StreamStats are based on the manual 

computation procedures used by Tortorelli (1997). However, 

the automated computations generally should be more precise 

than manual measurements (Tortorelli, 1997) because the 

Oklahoma StreamStats slope computations are performed 

exclusively on 1:24,000-scale data. 

Percent Impervious Area (IMPNLCD01)

Peak flows can be augmented by urbanization in the 

drainage area of a stream. Urbanization tends to increase the 

amount of impervious surface and decrease the amount of 

small depression storage. The net effect is an earlier and increased peak flow downstream (Konrad, 2003). The Oklahoma 

StreamStats application, to support a documented procedure 

for adjusting peak-flow frequency statistics for urbanized areas 

(Tortorelli, 1997), allows computation of percent impervious 

area (IMPNLCD01) as a drainage-basin characteristic. Percent 

impervious area was not used as an independent variable in the 

peak-flow regressions, but this basin characteristic is useful 

when performing urban adjustments of peak-flow frequency 

statistics (see Urban Adjustment section).

The computation of percent impervious area uses the 

2001 National Land Cover Database (NLCD) Impervious 

Surface derivative (Multi-Resolution Land Characteristics 

Consortium, 2008; fig. 8). The 2001 NLCD Impervious Surface derivative is a 30-meter resolution raster dataset classified 

into integer percent values (0–100) representing the percentage of each cell that is impervious (fig. 8). These values are 

simply averaged over a delineated drainage basin to compute 

the percentage of the basin that is impervious. Most drainage 

basins in Oklahoma will contain less than 1 percent impervious area, but percent impervious area can exceed 60 percent 

for small urban drainage basins in downtown Oklahoma City 

and Tulsa (fig. 8). 

Computing Peak-Flow Frequency 

Statistics

The Oklahoma StreamStats application interacts with 

the National Streamflow Statistics database (U.S. Geological Survey, 2009), which contains the peak-flow regression 

equations published by Tortorelli (1997). Fourteen peak-flow 

(flood) frequency statistics are available for computation in 

the Oklahoma StreamStats application. These statistics include 

the peak flow at 2-, 5-, 10-, 25-, 50-, 100-, and 500-year 

recurrence intervals for rural, unregulated streams; and the 

peak flow at 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals for rural streams that are regulated by NRCS 

FWR structures. When a user selects one or more statistics 

for computation, the required basin characteristics (independent variables) are computed automatically. All 14 peak-flow 

frequency statistics require the computation of (1) contributing 

drainage area (CONTDA) or contributing drainage area that 

is unregulated by NRCS FWR structures (DAUNREG), (2) 

outlet mean-annual precipitation (PRCOUT61), and (3) 10-85 

channel slope (CSL10_85fm).

Rural, Unregulated Streams

The following regression equations, based on Tortorelli 

(1997), are used to estimate peak-flow statistics in rural, unregulated Oklahoma streams:

PK2 = 0.075 (CONTDA)0.615(CSL10_85fm)0.159(PRCOUT61)2.103

PK5 = 0.799 (CONTDA)0.616(CSL10_85fm)0.173(PRCOUT61)1.637

PK10 = 2.62 (CONTDA)0.615(CSL10_85fm)0.181(PRCOUT61)1.404

PK25 = 8.80 (CONTDA)0.614(CSL10_85fm)0.190(PRCOUT61)1.171

PK50 = 18.6 (CONTDA)0.614(CSL10_85fm)0.197(PRCOUT61)1.029

PK100 = 35.6 (CONTDA)0.614(CSL10_85fm)0.202(PRCOUT61)0.907

PK500 = 126 (CONTDA)0.612(CSL10_85fm)0.213(PRCOUT61)0.674

The estimated peak-flow statistics at 2-, 5-, 10-, 25-, 50-, 

100-, and 500-year recurrence intervals for rural, unregulated 

streams (PK2 – PK500) are reported in units of cubic feet per 

second. Contributing drainage area (CONTDA) is in units of 

square miles, 10–85 channel slope (CSL10_85fm) is in units 

of feet per mile, and mean-annual precipitation for the period 

1961–1990 at the outlet (PRCOUT61) is in units of inches. 
14 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams Albers Equal-Area Conic Projection North American Datum 1983 KANSASTEXAS

ARKANSAS

MISSOURI COLORADO

NEW

MEXICO

EXPLANATION

Processed area boundaryState boundaryStream1000

Impervious area, in percent

100° W

36° N

97° W

94° W 103° W

34° N

0 5025 MILES0 50 KILOMETERS

OklahomaCity

Tulsa

Figure 8. Impervious areas (Multi-Resolution Land Characteristics Consortium, 2008), in percent, in the Oklahoma StreamStats processed area.
Accuracy and Limitations 15

Rural, Natural Resources Conservation Service 

Floodwater Retarding Structure-Regulated 

Streams

For rural streams that are partially regulated by NRCS 

FWR structures, only the unregulated contributing drainage 

area (that which is downstream from FWR structures) is likely 

to contribute to peak flows (PK2(FWR) – PK500(FWR)). The peakflow regression equations for rural streams regulated by NRCS 

FWR structures are the same as for rural, unregulated streams, 

except the contributing drainage area that is unregulated by 

NRCS FWR structures (DAUNREG) is substituted for the 

contributing drainage area (CONTDA). This substitution is 

only valid (1) if the percentage of contributing drainage area 

regulated by NRCS FWR structures (NRCSPCT) is less than 

86 percent (Tortorelli and Bergman, 1985; Tortorelli, 1997), 

and (2) under the assumption that drainage areas upstream 

from NRCS FWR structures do not substantially contribute to 

the magnitude of peak flows downstream. 

The following regression equations, based on Tortorelli 

(1997), are used to estimate peak-flow statistics in rural Oklahoma streams regulated by NRCS FWR structures: 

PK2(FWR) = 0.075 (DAUNREG)0.615(CSL10_85fm)0.159(PRCOUT61)2.103

PK5(FWR) = 0.799 (DAUNREG)0.616(CSL10_85fm)0.173(PRCOUT61)1.637

PK10(FWR) = 2.62 (DAUNREG)0.615(CSL10_85fm)0.181(PRCOUT61)1.404

PK25(FWR) = 8.80 (DAUNREG)0.614(CSL10_85fm)0.190(PRCOUT61)1.171

PK50(FWR) = 18.6 (DAUNREG)0.614(CSL10_85fm)0.197(PRCOUT61)1.029

PK100(FWR) = 35.6 (DAUNREG)0.614(CSL10_85fm)0.202(PRCOUT61)0.907

PK500(FWR) = 126 (DAUNREG)0.612(CSL10_85fm)0.213(PRCOUT61)0.674

The estimated peak-flow statistics at 2-, 5-, 10-, 25-, 

50-, 100-, and 500-year recurrence intervals for rural streams 

regulated by NRCS FWR structures (PK2(FWR) – PK500(FWR)) 

are reported in units of cubic feet per second. Contributing 

drainage area that is unregulated by NRCS FWR structures 

(DAUNREG) is in units of square miles, 10–85 channel 

slope (CSL10_85fm) is in units of feet per mile, and meanannual precipitation for the period 1961–1990 at the outlet 

(PRCOUT61) is in units of inches. 

Urban Adjustment

The percent impervious area and percentage of area 

served by storm sewers can be used to estimate an urban 

adjustment factor (RL) for peak streamflow by using a graphical method developed by Leopold (1968) (fig. 9). The RL is the 

ratio of the mean-annual flood in urban basins to the meanannual flood in rural basins. Sauer (1974) created equations 

to adjust peak-flow frequency statistics for urban effects in 

Oklahoma basins by using the RL:

PK2(urban) = (RL)PK2

PK5(urban) = 1.60(RL-1)PK2+ 0.167(7-RL)PK5

PK10(urban) = 1.87(RL-1)PK2+ 0.167(7-RL)PK10

PK25(urban) = 2.21(RL-1)PK2+ 0.167(7-RL)PK25

PK50(urban) = 2.46(RL-1)PK2+ 0.167(7-RL)PK50

PK100(urban) = 2.72(RL-1)PK2+ 0.167(7-RL)PK100

PK500(urban) = 3.30(RL-1)PK2+ 0.167(7-RL)PK500

The estimated peak-flow statistics at 2-, 5-, 10-, 25-, 50-, 

100-, and 500-year recurrence intervals for urban (PK2(urban) – 

PK500(urban)) and rural streams (PK2 – PK500) are reported in 

cubic feet per second.

StreamStats can be used to compute an estimate of the 

percent impervious area in each delineated drainage basin, but 

computation of the percentage of area served by storm sewers requires local knowledge in a basin and cannot easily be 

estimated by using current GIS techniques. Currently (2010), 

urban adjustments were not applied by the Oklahoma StreamStats application. Proper estimation and application of the 

urban adjustment factor are the responsibility of the StreamStats user.

Accuracy and Limitations

The regression equations incorporated into StreamStats 

can be used to estimate peak-flow frequency statistics, but 

the true values of those statistics are unknown. The following 

sections describe the uncertainty, accuracy, and constraints 

associated with peak-flow frequency statistics estimated by 

using the Oklahoma StreamStats application.
16 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Regression Accuracy 

The accuracy of regression equations can be evaluated 

by using performance metrics such as the adjusted R-squared 

and the standard error. Performance metrics from regression 

equations used to estimate peak-flow frequency statistics are 

listed in table 2 and are from Tortorelli (1997). The adjusted 

R-squared, or the adjusted coefficient of determination, is a 

measure of the percentage of the variation explained by the 

independent variables of the regression and ranges from 0 to 

1.0. The adjusted R-squared is adjusted on the basis of the 

degrees of freedom in the regression and penalizes regressions 

that use an excess number of independent variables. Adjusted 

R-squared evaluates the random error of the estimates. The 

greater the R-squared, the greater the probability that the 

regression equation will accurately estimate the dependent 

variable 

The standard error of the estimate, which can be expressed in original units, log units, or as a percent, measures 

the deviation between the measured and estimated data points 

used to build the regression equation. The standard error of the 

estimate is the average of all the residual values (the distance 

between the measured data point and the estimated data point 

from the regression) divided by the degrees of freedom of the 

regression. The standard error also can be expressed in terms 

of equivalent years of record, which is the number of years of 

PERCENT IMPERVIOUS AREA

PERCENT OF AREA SERVED BY STORM SEWERAGE

0

100

20

40

60

80

0 20 40 60 80 100

R = 7 L

6

5

4

3

2.5

1.5

2

R = 1 L

R =L

discharge after urbanization

discharge before urbanization

EXPLANATION

Figure 9. Urban adjustment factor (RL) showing effect of urbanization on mean-annual flood for a 

1-square-mile drainage area (modified from Leopold, 1968).
Accuracy and Limitations 17

streamflow record that is needed at an ungaged site to provide an estimate equal in accuracy to the standard error of the 

regression equation (Tortorelli, 1997).

Scope of Valid Application

The Tortorelli (1997) peak-flow regression equations for 

rural, unregulated streams are only valid for drainage basins 

with characteristics that are in the range of characteristics 

used to create the regressions. For example, the regression 

equations should not be applied in basins where drainage area 

is greater than 2,510 mi2 or less than 0.144 mi2 (table 3). Constraints on other basin characteristics appear in table 3.

Comparison of Basin Characteristics Computed 

by Using Manual and Automated Techniques

Forty-three of the 251 gages used by Tortorelli (1997) to 

construct the 14 peak-flow regression equations were outside 

of the StreamStats processed HUs (fig. 2). For the remaining 

208 gages (fig. 10), basin characteristics computed by using 

StreamStats were compared to basin characteristics computed 

manually by Tortorelli (1997) (appendix 1). For contributing 

drainage area (CONTDA), which is generally the most influential variable in the regression equations, the two estimates 

were nearly equal at most sites (fig. 11); 53 percent of the 

StreamStats computed contributing areas were greater and 

47 percent were lesser than variables computed by Tortorelli 

(1997). Computations of mean-annual precipitation at the 

drainage-basin outlet (PRCOUT61) in StreamStats also were 

in close agreement with computations of Tortorelli (1997) (fig. 

11); 53 percent of the StreamStats computed precipitation values were greater and 47 percent were lesser than computations 

done by Tortorelli (1997). 

StreamStats automated computations of 10–85 channel 

slope (CSL10_85fm) tend to be slightly less than the manual 

computations of Tortorelli (1997); 24 percent of the StreamStats computed 10–85 channel slope values (CSL10_85fm) 

were greater and 76 percent were lesser than computations 

done by Tortorelli (1997). Most of the overestimation of Tortorelli (1997) 10–85 channel slopes relative to StreamStats estimates seems to be the result of map-scale effects on measurements of the basin longest flow-path length. Tortorelli (1997), 

who measured 10–85 channel slopes by using several map 

scales ranging from 1:24,000 to 1:250,000, tends to underestimate the basin longest flow-path length by about 20 percent 

as compared to StreamStats computations of longest flow-path 

length (L, fig. 11). Maps, by definition, are simplified representations of the earth’s surface, and lose detail with decreasing map scale. Therefore, a stream represented at 1:250,000 

scale is less detailed than the same stream represented at 

1:24,000 scale. If the stream length was measured at both 

scales, the 1:250,000-scale stream would be shorter than the 

1:24,000-scale stream. Also, more sinuous streams generally 

will be “shortened” to a greater degree than straighter streams 

in any map representation. Likewise, more sinuous segments 

of a given stream, mostly at downstream locations, are more 

simplified than straighter upstream segments and will receive 

greater “shortening” because of map-scale effects. Additional 

“shortening” could happen when using manual measurement 

techniques, as compared to automated methods at the same 

scale, because planimeters and map wheels are subject to some 

mechanical error.

Manual computations of the 10–85 change in elevation (Tortorelli, 1997) generally are greater than StreamStats 

automated computations of the 10–85 change in elevation. 

Because the placement of the 10–85 reference points is 

dependent on the measurement of stream length and because 

the measurement of stream length is dependent on map scale, 

the 10–85 change in elevation is dependent on map scale. 

The 10–85 reference points placed by using 1:24,000-scale 

maps will tend to be farther downstream than the corresponding 10–85 reference points placed by using 1:250,000-scale 

maps. The effect of this shift on the 10–85 change in elevation 

will vary with the sinuosity, length, and profile shape of each 

Table 2. R-squared and standard error of regression equations for unregulated streams (Tortorelli, 1997).

[equivalent years of record, the number of years of streamflow record that is needed at an ungaged site to provide an estimate equal in accuracy to the standard 

error of the regression equation]

Recurrence interval in 

years Adjusted R-squared Weighted standard error of estimate (log10 units)

Weighted standard error 

of estimate (percent)

Equivalent years of 

record

2 0.8780 0.2373 59 3

5 0.9099 0.1937 47 5

10 0.9141 0.1846 45 8

25 0.9108 0.1864 45 11

50 0.9035 0.1929 47 13

100 0.8933 0.2026 49 14

500 0.8605 0.2331 58 14
18 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

stream. However, the difference between 10–85 change in 

elevation measured at successive map scales will be greatest 

for streams in small basins with steep headwater reaches and 

gently sloping, highly sinuous downstream reaches (fig. 11). 

Underestimation of longest flow-path length and overestimation of the 10–85 change in elevation result in overestimation of the 10–85 channel slope. The difference in 

slopes computed by manual (Tortorelli, 1997) and automated 

methods (StreamStats) should not cause a large difference in 

estimated peak-flow frequency statistics because the statistical 

significance of 10–85 channel slope as an independent variable 

in the regression is less than that of contributing drainage area 

or mean-annual precipitation at the drainage-basin outlet. 

Comparison of Peak-Flow Frequency Statistics 

Computed by Using Manual and Automated 

Computations of Basin Characteristics

The differences in values for 10–85 channel slope and 

longest flow-path length have some effect on estimates of 

peak-flow frequency statistics, but these differences tend 

to be small because 10–85 channel slope (CSL10_85fm) is 

generally the least influential term in the peak-flow regression 

equation for most sites. On average, the StreamStats computed 

peak-flow frequency statistics tend to be slightly less than 

peak-flow frequency statistics computed by Tortorelli (1997) 

for 208 gages (appendix 2); about 60-67 percent of StreamStats peak-flow values for each statistic were less than peakflow values computed by Tortorelli (1997). However, a graphical comparison of PK5, PK50, and PK500 computed by using 

StreamStats basin characteristics as compared to Tortorelli 

(1997) basin characteristics shows that all peak-flow values 

computed at the 208 gages fall within the weighted standard 

error of estimate reported by Tortorelli (1997) (table 2; fig. 12) 

for each regression equation. In other words, the error because 

of differences in basin characteristic computation between 

Tortorelli (1997) and StreamStats is expected to be small 

compared to the error associated with the regionalized regression method for estimating peak-flow frequency statistics at 

ungaged sites.

Because the peak-flow regressions of Tortorelli (1997) 

were performed by using basin characteristic computation 

methods and streamflow data that were available in 1995, the 

peak-flow frequency statistics may not be optimized for use 

today (2010). The computational accuracy of methods for 

determining contributing drainage area and 10–85 channel 

slope have improved since the publication of Tortorelli (1997). 

Also, as more streamflow data become available each year, 

additional gages qualify for inclusion in statistical studies, and 

previously included gages have longer and more representative periods of record. Therefore, the Oklahoma peak-flow 

regressions should be periodically reevaluated and updated to 

ensure that the regressions remain accurate and relevant.

Summary

The USGS Streamflow Statistics (StreamStats) Program 

was created to make geographic information systems (GIS)-

based estimation of streamflow statistics easier, faster, and 

more consistent than previously used manual techniques. The 

StreamStats user interface is a map-based internet application that allows users to easily obtain streamflow statistics, 

basin characteristics, and other information for user-selected 

USGS data-collection stations and ungaged sites of interest. 

The application relies on the data collected at U.S. Geological 

Survey streamflow-gaging stations, computer aided computations of drainage-basin characteristics, and published regression equations for several geographic regions comprising the 

United States. The StreamStats application interface allows 

the user to (1) obtain information on features in selected map 

layers, (2) delineate drainage basins for ungaged sites, (3) 

download drainage-basin polygons to a shapefile, (4) compute 

selected basin characteristics for delineated drainage basins, 

Table 3. Ranges of validity for basin characteristics (independent variables) used in computation of peak-flow frequency 

statistics in Oklahoma (modified from Tortorelli, 1997).

[mi2, square miles; ft/mi, feet per mile; in., inches; %, percent; NRCS, National Resources Conservation Service; FWR, floodwater retarding; 10–85 

channel slope, slope between points at 10 percent and 85 percent of longest flow-path length upstream from the outlet]

Independent variable Minimum Maximum 

Contributing area (CONTDA) or contributing drainage area that 

is unregulated by NRCS FWR structures (DAUNREG)

0.144 mi2 2,510 mi2

10–85 channel slope (CSL10_85fm) 1.89 ft/mi 288* ft/mi

Mean-annual precipitation at drainage-basin outlet (PRCOUT61) 15.0 in. 55.2 in.

Percentage of contributing drainage area regulated by NRCS 

FWR structures (NRCSPCT)

0.0 % 86 %

*

The station with the maximum 10–85 channel slope (Tortorelli, 1997) does not appear in appendix 1 because it was outside of the StreamStats 

processed area.
Summary 19

Albers Equal-Area Conic ProjectionNorth American Datum 1983

KANSAS

TEXAS

ARKANSAS

MISSOURI COLORADO

NEW

MEXICO

EXPLANATION

Processed area boundaryState boundaryStream

100° W

36° N

97° W

94° W 103° W

34° N

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

#

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98

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57 56

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37 36 34

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28 23

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18

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99

85

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58

45 35

32

26

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19

226 225

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136 135

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0 5025 MILES0 50 KILOMETERS

#47 U.S. Geological Survey 

streamflow gage with sitenumber shown in appendix 1(Tortorelli, 1997)

Figure 10. Location of 208 of 251 gages (Tortorelli, 1997) used to construct peak-flow regression equations. Forty-three of the 251 gages were outside of the StreamStats processed area.
20 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

1 2 3 4 5 6 7 8 10 2 3 4 5 6 7 100 2 3

10-85 CHANNEL SLOPE

(STREAMSTATS), IN FEET PER MILE

1

10

100

2

3

4

5

6

7

8

9

2

3

4

5

6

7

8

9

2

3

CSL10_85fm

1 0 -8 5 C H ANNE L S L O P E

(T O R T O R E L L I, 1 9 9 7 ), IN F E E T P E R MIL E

1 :1

∆E L E V

C H ANG E IN E L E V AT IO N (1 0 -8 5 )

(TO R T O R E L L I, 1 9 9 7 ), IN F E E T

1 :1

0 50 100 150 200 250

LONGEST FLOW-PATH LENGTH 

(STREAMSTATS), IN MILES

0

50

100

150

200

250

L

L O NG E S T F L O W-P AT H L E NG T H

(TO R T O R E L L I, 1 9 9 7 ), IN MIL E S

1 :1

10 20 30 40 50 60

OUTLET MEAN ANNUAL PRECIPITATION 

(STREAMSTATS), IN INCHES

10

20

30

40

50

60

PRCOUT61

O U T L E T ME AN ANNU AL P R E C IP IT AT IO N

(TO R T O R E L L I, 1 9 9 7 ), IN INC H E S

1 :1

CONTRIBUTING DRAINAGE AREA 

(STREAMSTATS), IN SQUARE MILES

CONTDA

C O NT R IBU T ING D R AINAG E AR E A

(TO R T O R E L L I, 1 9 9 7 ), IN S Q U AR E MIL E S

1 :1

0.1 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 2 3 4 5 6 2 1 10 100 1,000 3

1

10

100

1,000

2

3

4

5

7

2

3

4

5

7

2

3

4

5

7

2

3

4

5

7

2

0.1

3

U.S. Geological Survey streamflow-gaging station 

data point (Size of symbol is roughly proportional to 

drainage basin contributing area)

Linear trendline

Line of perfect fit

Panhandle basins

with large amounts

of noncontributing

area; noncontributing areas are 

better accounted 

for in StreamStats

10 100 1000 2 3 4 5 6 7 8 2 3 4 5 6 7 8 2 3 10

100

1000

2

3

4

5

6

7

8

2

3

4

5

6

7

8

2

3

CHANGE IN ELEVATION (10-85) 

(STREAMSTATS), IN FEET

2 0 percent

}

4

CSL10_85fm

∆ELEV

L

PRCOUT61

CONTDA Contributing drainage area

Mean annual precipitation (1961-1990) at the outlet

Channel slope between points at 10 percent and 85 percent

of the longest flow-path length upstream from the outlet

Change in elevation between points at 10 percent and 85 

percent of the longest flow-path length

Longest flow-path length from outlet to basin divide

EXPLANATION

Figure 11. Comparison of basin characteristics from Tortorelli (1997), which were mostly computed by using manual techniques at a 

variety of map scales, and StreamStats, which were computed by using automated techniques on 1:24,000 scale data.
Summary 21

47 percent

ESTIMATED PEAK-FLOW (TORTORELLI, 1997), IN CUBIC FEET PER SECOND

0 50,000 100,000 150,000 200,000 250,000 300,000

0

50000

300000250000200000150000100000

58 percent

0 10,000 20,000 30,000 40,000 50,000 60,000 70,000

0

70,00060,00050,00040,00030,00020,00010,000

47 percent

PK5 PK50PK500

ESTIMATED PEAK-FLOW (STREAMSTATS), IN CUBIC FEET PER SECOND

0 40,000 80,000 120,000 160,000 0

80,00040,000

160,000120,000

EXPLANATION

Weighted standard error of the estimate, in percent 47 percent

PK5

PK50

PK500

U.S. Geological Survey streamflow-gaging station data point (Size of symbol is roughly proportional to drainage basin contributing area)Peak flow at 5-year recurrence interval for rural, unregulated streamsPeak flow at 50-year recurrence interval for rural, unregulated streamsPeak flow at 500-year recurrence interval for rural, unregulated streams

Figure 12. Comparison of peak-flow frequency statistics estimated by using basin characteristics at gaged sites.
22 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

(5) estimate selected streamflow statistics for ungaged points 

on a stream, (6) print map views, (7) retrieve information for 

USGS streamflow-gaging stations, and (8) get help on using 

StreamStats. 

StreamStats was designed for national application, with 

each state, territory, or group of states responsible for creating 

unique geospatial datasets and regression equations to compute selected streamflow statistics. With the cooperation of 

the Oklahoma Department of Transportation, StreamStats has 

been implemented for Oklahoma and is available at 

http://water.usgs.gov/osw/streamstats/.

The primary purpose of the Oklahoma StreamStats 

application is to provide estimates of drainage-basin characteristics and automatic estimation of streamflow statistics 

for user-selected ungaged sites on Oklahoma streams. The procedures created into the Oklahoma StreamStats application are 

optimized for rural, unregulated drainage basins in Oklahoma 

and with less than 2,510 square miles of contributing drainage 

area. The peak-flow estimation procedures also can be used in 

basins regulated by small floodwater retarding structures with 

the understanding that results may be less accurate in those 

settings. This report also describes a procedure for adjusting 

estimated peak-flow frequency statistics for urbanization effects. 

The Oklahoma StreamStats application covers 69 

processed hydrologic units and most of the state of Oklahoma. Basin characteristics available for computation include 

contributing drainage area, contributing drainage area that 

is unregulated by Natural Resources Conservation Service 

floodwater retarding structures, mean-annual precipitation at 

the drainage-basin outlet for the period 1961–1990, 10–85 

channel slope (slope between points located at 10 percent 

and 85 percent of the longest flow-path length upstream from 

the outlet), and percent impervious area. In addition to these 

basin characteristics, 14 peak-flow (flood) frequency statistics 

are available for computation in the Oklahoma StreamStats 

application: the peak flow at 2-, 5-, 10-, 25-, 50-, 100-, and 

500-year recurrence intervals for rural, unregulated streams; 

and the peak flow at 2-, 5-, 10-, 25-, 50-, 100-, and 500-year 

recurrence intervals for rural streams that are regulated by 

Natural Resources Conservation Service floodwater retarding structures. Basin characteristics and streamflow statistics 

cannot be computed for locations in playa basins (mostly in 

the Oklahoma Panhandle) and along main stems of the largest 

river systems in the state, namely the Arkansas, Canadian, 

Cimarron, Neosho, Red, and Verdigris Rivers, because parts of 

the drainage areas extend outside of the processed hydrologic 

units.

Forty-three of the 251 gages used in a previous report to 

construct the 14 peak-flow regression equations were outside of the StreamStats processed hydrologic units. For the 

remaining 208 gages, basin characteristics computed by using 

StreamStats were compared to characteristics computed manually in a previous report. For contributing area, which is generally the most influential variable in the regression equations, 

the two estimates were nearly equal at most sites; 53 percent 

of the StreamStats computed contributing areas were greater 

and 47 percent were lesser than contributing areas computed 

in a previous report. Computations of mean-annual precipitation at the drainage-basin outlet in StreamStats were also in 

close agreement with computations in a previous report; 53 

percent of the StreamStats computed precipitation values were 

greater and 47 percent were lesser than precipitation values 

computed for a previous report. 

StreamStats automated computations of 10–85 channel 

slope tend to be slightly less than the manual computations 

done in a previous report; 24 percent of the StreamStats computed slope values were greater and 76 percent were less than 

slope values computed manually. The differences in values for 

10–85 channel slope have some effect on estimates of peakflow frequency statistics, but these differences tend to be small 

because 10–85 channel slope is generally the least influential 

term in the peak-flow regression equation for most sites. On 

average, the StreamStats computed peak-flow frequency statistics tend to be slightly less than peak-flow frequency statistics 

computed in a previous report for 208 gages; about 60–67 

percent of StreamStats peak-flow values for each statistic were 

less than peak-flow values computed in a previous report. 

However, the error because of differences in basin characteristic computation between a previous report and StreamStats 

is expected to be small compared to the error associated with 

the regionalized regression method for estimating peak-flow 

frequency statistics at ungaged sites.

References Cited

Daly, Christopher, Neilson, R.P., and Phillips, D.L., 1994, A 

statistical-topographic model for mapping climatological 

precipitation over mountainous terrain: Journal of Applied 

Meteorology, v. 33 p. 140–158.

Environmental Systems Research Institute, Inc., 2007, Hydro 

Data Model: Environmental Systems Research Institute, 

Inc., available online at http://support.esri.com/index.

cfm?fa=downloads.dataModels.filteredGateway&dmid=15. 

(Accessed November 13, 2008.)

Hirsch, R.M., Helsel, D.R., Cohn, T.A., and Gilroy, E.J., 1993, 

Statistical treatment of hydrologic data, in Maidment, D.R., 

ed., Handbook of Hydrology: New York, McGraw-Hill, p. 

17.1–17.55.

Koltun, G.F., Kula, S.P., and Puskas, B.M., 2006, A streamflow statistics (StreamStats) web application for Ohio: 

U.S. Geological Survey Scientific Investigations Report 

2006–5312, 62 p.

Konrad, C.P., 2003, Effects of urban development on floods: 

U.S. Geological Survey Fact Sheet 076–03, 4 p.
References Cited 23

Leopold, L.B., 1968, Hydrology for urban land planning—A 

guidebook on the hydrologic effects of urban land use: U.S. 

Geological Survey Circular 554, 18 p.

Lewis, J.M. and Esralew, R.A., 2009, Statistical summaries of 

streamflow in and near Oklahoma through 2007: U.S. Geological Survey Scientific Investigations Report 2009–5135, 

633 p.

Mandelbrot, B.B., 1983, The fractal geometry of nature: W. H. 

Freeman, New York, 468 p.

Multi-Resolution Land Characteristics Consortium, 2008, 

2001 National Land Cover Database (NLCD), available online at http://www.epa.gov/mrlc/nlcd-2001.html. 

(Accessed August 21, 2008.)

Natural Resources Conservation Service, 2006, Watershed 

Boundary Dataset (WBD): U.S. Department of Agriculture, 

available online at http://www.ncgc.nrcs.usda.gov/products/

datasets/Watershed/. (Accessed November, 2006.)

Oklahoma Water Resources Board (OWRB), 2007, Oklahoma 

Water Atlas, available only online at http://www.owrb.

ok.gov/news/publications/wa/wa.php.

PRISM Climate Group, 2008, Normal annual precipitation 

grid for the conterminous United States. available online 

at http://www.prism.oregonstate.edu/state_products/maps.

phtml?id=US. (Accessed March 24, 2008.)

Rea, Alan, and Skinner, K.D., 2009, Estimated perennial 

streams of Idaho and related geospatial datasets: U.S. Geological Survey Data Series 412, 32 p.

Ries, K.G., III, Guthrie, J.G., Rea, A.H., Steeves, P.A., Stewart, D.W., 2008, StreamStats: A water resources web application: U.S. Geological Survey Fact Sheet 2008–3067, 6 p. 

(Available online at http://pubs.usgs.gov/fs/2008/3067/.)

Ries, K.G., III, Steeves, P.A., Coles, J.D., Rea, A.H., and 

Stewart, D.W., 2004, StreamStats—A U.S. Geological Survey web application for stream information: U.S. Geological Survey Fact Sheet 2004–3115, 4 p.

Sauer, V.B., 1974, An approach to estimating flood frequency 

for urban areas in Oklahoma: U.S. Geological Survey 

Water-Resources Investigations Report 23–74, 10 p.

Tasker, G.D., and Driver, N.E., 1988, Nationwide regression models for predicting urban runoff water quality at 

unmonitored sites: Water Resources Bulletin, v. 24, no. 5, 

p. 1,091–1,101.

Tortorelli, R.L., 1997, Techniques for estimating peak-streamflow frequency for unregulated streams and streams regulated by small floodwater retarding structures in Oklahoma: 

U.S. Geological Survey Water-Resources Investigations 

Report 97–4202, 39 p.

Tortorelli, R.L., 2002, Statistical summaries of streamflow in 

Oklahoma through 1999: U.S. Geological Survey WaterResources Investigations Report 02–4025, 510 p.

Tortorelli, R.L., and Bergman, D.L., 1985, Techniques for estimating flood peak discharges for unregulated streams and 

streams regulated by small floodwater retarding structures 

in Oklahoma: U.S. Geological Survey Water-Resources 

Investigations Report 84–4358, 85 p.

U.S. Geological Survey, 2006, National Elevation Dataset: 

U.S. Geological Survey, available only online at http://ned.

usgs.gov/.

U.S. Geological Survey, 2008, National Hydrography Dataset: 

U.S. Geological Survey, available only online at http://nhd.

usgs.gov.

U.S. Geological Survey, 2009, National Streamflow Statistics 

Program, available only online at http://water.usgs.gov/osw/

programs/nss/index.html. (Accessed April 15, 2009.)
24 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams
Appendix 25

Appendix
26 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean 

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean 

annual 

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream 

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

17 07148100 Grouse Creek near Dexter, Kans. 170 34.5 35.2 8.16 40.2 246.02 9.51

18 07148350 Salt Fork Arkansas River near Winchester, Okla. 856 24.9 24.5 15.10 52.5 594.56 3.22

19 07148400 Salt Fork Arkansas River near Alva, Okla. 1,009.00 26.3 24.6 14.80 70 777.00 4.86

22 07150580 Sand Creek Trib. near Kremlin, Okla. 7.21 31.7 31.6 19.30 6.9 99.88 6.6

23 07150870 Salt Fork Arkansas River Trib. near Eddy, Okla. 2.35 32.9 32.9 19.80 2.7 40.10 3.1

24 07151500 Chikaskia River near Corbin, Kans. 794 31.2 28.9 7.79 90.9 531.08 10.41

26 07152000 Chikaskia River near Blackwell, Okla. 1,859.00 33.1 30.0 7.25 136 739.50 9.95

27 07152360 Elm Creek near Foraker, Okla. 18.2 35.7 36.1 17.50 9.4 123.38 4.85

28 07152410 Rock Creek near Shidler, Okla. 9.13 35.9 35.9 35.80 5.4 144.99 3.19

29 07152520 Black Bear Creek Trib. near Garber, Okla. 0.97 32.6 32.6 42.30 1.2 38.07 1.48

30 07152842 Subwatershed W-4 near Morrison, Okla. 0.32 33.5 33.5 74.90 0.84 47.19 2.21

31 07152846 Subwatershed W-3 near Morrison, Okla. 0.14 33.5 33.4 104.00 0.66 51.48 3.03

32 07153000 Black Bear Creek at Pawnee, Okla. 576 35.8 33.7 4.05 71 215.66 8.75

33 07153500 Dry Cimarron River near Guy, N. Mex. 545 16.2 17.1 50.00 54 2,025.00 5.35

34 07154400 Carrizozo Creek near Kenton, Okla. 111 16.7 16.8 38.00 34.2 974.70 10.54

35 07154500 Cimarron River near Kenton, Okla. 1,038.00 16.6 17.0 26.20 104 2,043.60 10.42

36 07155000 Cimarron River above Ute Creek near Boise 

City, Okla. 1,879.00 15.0 17.1 21.00 138 2,173.50 10.14

37 07155100 Cold Springs Creek near Wheeless, Okla. 11 16.3 16.3 29.10 8.1 176.78 5.96

45 07157500 Crooked Creek near Nye, Kans. 813 21.6 21.2 4.23 127 402.91 19.84

46 07157550 West Fork Creek near Knowles, Okla. 4.22 21.7 21.7 59.20 3.9 173.16 3.6

47 07157900 Cavalry Creek at Coldwater, Kans. 39 24.5 24.5 8.61 17.5 113.01 7.85

48 07157960 Buffalo Creek near Lovedale, Okla. 408 25.0 25.2 12.76 38.7 370.36 3.67

49 07158020 Cimarron River Trib. near Lone Wolf, Okla. 4.26 26.4 26.3 37.10 5.3 147.47 6.59

50 07158080 Sand Creek Trib. near Waynoka, Okla. 1.61 25.9 25.9 62.40 2.2 102.96 3.01

51 07158180 Salt Creek Trib. near Okeene, Okla. 8.23 29.2 29.1 30.00 8 180.00 7.78
Appendix 27

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli, 

1997)

Station

no.

StreamStats

Contributing drainage area, 

in square 

miles 

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated 

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85 

change

in

elevation

of

longest

flow

path,

in feet 

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

17 07148100 171.34 162.10 5.40 35.00 8.63 41.62 269.35 0.22

18 07148350 827.23 827.23 0.00 25.13 9.40 99.66 702.85 0.10

19 07148400 982.09 982.09 0.00 26.45 8.43 121.85 770.13 0.21

22 07150580 7.13 7.13 0.00 31.76 14.76 9.08 100.49 0.39

23 07150870 2.51 2.51 0.00 32.96 19.55 3.11 45.63 0.25

24 07151500 812.58 812.58 0.00 31.17 7.67 122.22 703.24 0.32

26 07152000 1,873.05 1,873.05 0.00 32.95 6.58 164.58 812.61 0.38

27 07152360 18.34 18.34 0.00 36.19 14.65 12.13 133.33 0.17

28 07152410 9.06 9.06 0.00 36.20 33.19 6.58 163.89 0.16

29 07152520 1.02 1.02 0.00 32.51 24.01 2.62 47.09 1.49

30 07152842 0.33 0.33 0.00 34.14 52.70 1.31 51.92 0.24

31 07152846 0.08 0.08 0.00 34.32 182.11 0.43 59.09 0.45

32 07153000 538.32 279.66 48.05 35.67 3.39 97.05 246.72 0.78

33 07153500 527.58 527.58 0.00 15.05 33.60 71.49 1801.48 0.08

34 07154400 112.28 112.28 0.00 16.95 26.94 46.66 942.91 0.06

35 07154500 1,111.58 1,111.58 0.00 16.90 23.56 118.75 2097.87 0.09

36 07155000 1,966.87 1,966.69 0.00 14.65 19.48 153.95 2249.54 0.08

37 07155100 10.70 10.70 0.00 16.28 27.54 11.47 236.85 0.05

45 07157500 821.97 821.97 0.00 21.71 3.98 136.41 407.59 0.18

46 07157550 4.44 4.44 0.00 21.70 55.00 5.14 211.97 0.23

47 07157900 41.54 41.54 0.00 24.85 11.08 18.38 152.70 0.29

48 07157960 401.31 401.31 0.00 24.40 11.77 44.51 392.81 0.22

49 07158020 4.20 4.20 0.00 26.11 28.55 6.82 145.95 0.53

50 07158080 1.77 1.77 0.00 25.64 57.50 2.53 109.20 0.40

51 07158180 8.37 8.37 0.00 29.13 12.71 11.80 112.51 0.56
28 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean

annual

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

52 07158400 Salt Creek near Okeene, Okla. 196 29.5 28.8 20.15 27.4 414.08 3.83

53 07158500 Preacher Creek near Dover, Okla. 14.5 30.6 30.7 14.80 9.3 103.23 5.96

54 07158550 Turkey Creek Trib. near Goltry, Okla. 5.08 29.0 28.7 19.50 5.3 77.51 5.53

55 07159000 Turkey Creek near Drummond, Okla. 248 30.8 29.6 5.70 39 166.73 6.13

56 07159200 Kingfisher Creek near Kingfisher, Okla. 157 29.9 29.0 12.00 23.7 213.30 3.58

57 07159810 Watershed W-IV near Guthrie, Okla. 0.15 33.2 33.2 116.20 0.68 59.26 3.14

58 07160500 Skeleton Creek near Lovell, Okla. 410 31.5 31.3 8.40 43.4 273.42 4.59

59 07160550 West Beaver Creek near Orlando, Okla. 13.9 32.4 32.7 23.80 6.4 114.24 2.95

60 07163000 Council Creek near Stillwater, Okla. 31 35.3 35.2 17.30 9 116.78 2.61

61 07163020 Corral Creek near Yale, Okla. 2.89 35.4 35.4 53.90 2.4 97.02 1.99

62 07165550 Snake Creek near Bixby, Okla. 50 39.8 40.0 24.30 11.5 209.59 2.65

72 07170700 Big Hill Creek near Cherryvale, Kans. 37 41.9 41.0 9.10 24.2 165.17 15.83

73 07170800 Mud Creek near Mound Valley, Kans. 4.22 42.6 42.6 25.67 3.48 67.00 2.87

74 07171700 Spring Branch near Cedar Vale, Kans. 3.1 35.0 35.0 50.05 3.25 122.00 3.41

75 07171800 Cedar Creek Trib. near Hooser, Kans. 0.56 35.4 35.4 165.00 1.53 189.34 4.18

76 07172000 Caney River near Elgin, Kans. 445 38.0 35.9 7.39 60.6 335.88 8.25

77 07173000 Caney River near Hulah, Okla. 736 35.6 36.4 6.73 72.7 366.95 7.18

78 07174200 Little Caney River below Cotton Creek 

near Copan, Okla. 502 36.6 37.7 8.80 50.1 330.66 5

79 07174570 Dry Hollow near Pawhuska, Okla. 1.67 37.6 37.6 83.00 1.8 112.05 1.94

80 07174600 Sand Creek at Okesa, Okla. 139 37.7 37.6 13.50 37 374.63 9.85

81 07174720 Hogshooter Creek Trib. near Bartlesville, Okla. 0.94 38.4 38.4 58.20 1.1 48.02 1.29

82 07176500 Bird Creek at Avant, Okla. 364 38.3 38.1 6.22 55.8 260.31 8.55

83 07176800 Candy Creek near Wolco, Okla. 30.6 38.5 38.9 17.60 10.98 144.94 3.94

84 07177000 Hominy Creek near Skiatook, Okla. 340 38.0 37.2 7.20 46.3 250.02 6.3

85 07177500 Bird Creek near Sperry, Okla. 905 38.9 37.8 4.14 85 263.93 7.98
Appendix 29

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, 

Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

StreamStats

Contributing drainage area,

in square

miles

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85

change

in

elevation

of

longest

flow

path,

in feet

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

52 07158400 181.49 181.49 0.00 29.30 8.45 33.62 213.14 0.64

53 07158500 14.33 14.33 0.00 30.09 14.47 11.25 122.08 0.50

54 07158550 4.82 4.82 0.00 29.22 15.13 6.75 76.67 0.57

55 07159000 254.76 252.26 0.98 30.86 4.31 52.90 170.85 0.59

56 07159200 165.14 165.14 0.00 30.24 6.44 36.39 175.65 0.35

57 07159810 0.15 0.15 0.00 32.98 132.65 0.74 73.16 0.05

58 07160500 412.05 412.05 0.00 31.02 5.67 63.49 270.05 2.36

59 07160550 13.58 13.58 0.00 32.16 19.55 8.93 130.96 0.08

60 07163000 30.03 30.03 0.00 35.17 13.88 11.42 118.86 0.39

61 07163020 3.01 3.01 0.00 35.33 45.65 3.19 109.19 0.21

62 07165550 47.69 47.69 0.00 39.58 9.45 18.93 134.14 0.15

72 07170700 36.84 36.84 0.00 42.42 8.80 23.74 156.70 0.58

73 07170800 4.40 4.40 0.00 43.16 27.39 4.02 82.63 0.44

74 07171700 3.08 3.08 0.00 34.78 42.41 3.48 110.78 0.49

75 07171800 0.51 0.51 0.00 34.61 153.63 1.56 179.66 0.03

76 07172000 428.50 245.51 42.70 37.85 7.02 64.02 336.99 0.37

77 07173000 710.78 527.79 25.74 35.30 5.45 87.39 357.01 0.29

78 07174200 503.37 276.73 45.02 36.49 4.92 75.67 279.24 0.51

79 07174570 1.72 1.72 0.00 37.43 84.08 2.30 144.76 0.32

80 07174600 137.83 137.83 0.00 37.44 9.67 48.74 353.64 0.17

81 07174720 0.78 0.78 0.00 37.68 65.71 1.73 85.20 0.65

82 07176500 368.55 368.55 0.00 38.66 6.05 61.29 278.27 0.50

83 07176800 31.35 31.35 0.00 38.45 15.15 13.42 152.51 0.15

84 07177000 340.11 340.11 0.00 38.04 4.50 60.54 204.41 0.31

85 07177500 906.98 906.98 0.00 39.31 4.09 91.08 279.34 0.53
30 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean

annual

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

86 07178640 Bull Creek near Inola, Okla. 10.7 40.9 40.8 12.20 5.8 53.07 3.14

89 07184000 Lightning Creek near McCune, Kans. 197 41.3 42.3 3.43 45.8 117.82 10.65

90 07184500 Labette Creek near Oswego, Kans. 211 41.5 40.8 4.74 34.2 121.58 5.54

91 07184600 Fly Creek near Faulkner, Kans. 27 42.0 41.9 7.80 10.6 62.01 4.16

92 07185500 Stahl Creek near Miller, Mo. 3.86 43.6 43.6 4.13 3 9.29 2.33

94 07185700 Spring River at LaRussell, Mo. 306 43.2 43.5 9.84 32.9 242.80 3.54

96 07186000 Spring River near Waco, Mo. 1,164.00 42.2 43.3 6.08 72.8 331.97 4.55

97 07186400 Center Creek near Carterville, Mo. 232 42.9 43.1 8.90 48.4 323.07 10.1

98 07187000 Shoal Creek above Joplin, Mo. 410 42.9 43.2 8.34 57.9 362.16 8.18

99 07188000 Spring River near Quapaw, Okla. 2,510.00 43.4 43.1 5.93 101 449.20 4.06

100 07188140 Flint Branch near Peoria, Okla. 4.9 43.5 43.5 59.50 3.6 160.65 2.64

101 07188500 Lost Creek at Seneca, Mo. 42 42.9 43.2 25.20 14 264.60 4.67

102 07188900 Butler Creek Trib. near Gravette, Ark. 0.96 45.1 45.1 109.00 2 163.50 4.17

103 07189000 Elk River near Tiff City, Mo. 872 42.3 43.8 8.05 59.7 360.44 4.09

104 07190600 Big Cabin Creek near Pyramid Corners, Okla. 71.1 42.1 41.9 8.00 15 90.00 3.16

105 07191000 Big Cabin Creek near Big Cabin, Okla. 450 42.7 42.5 5.52 43.5 180.09 4.21

106 07191220 Spavinaw Creek near Sycamore, Okla. 133 44.3 45.2 20.00 22 330.00 3.64

107 07191260 Brushy Creek near Jay, Okla. 16 44.0 44.4 31.20 8.6 201.24 4.62

108 07192000 Pryor Creek near Pryor, Okla. 229 40.9 41.6 5.52 37.5 155.25 6.14

109 07194515 Mill Creek near Park Hill, Okla. 2.57 44.2 44.6 107.00 2.9 232.73 3.27

110 07195000 Osage Creek near Elm Springs, Ark. 130 45.0 45.2 16.90 18.2 230.69 2.55

111 07195200 Brush Creek Trib. near Tontitown, Ark. 0.37 44.9 44.9 107.00 1 80.25 2.7

112 07195450 Ballard Creek at Summers, Ark. 14.6 46.4 46.8 41.00 7.2 221.40 3.55

113 07195500 Illinois River near Watts, Okla. 635 45.4 45.4 8.50 44.5 283.69 3.12

114 07195800 Flint Creek at Springtown, Ark. 14.2 45.5 45.5 22.70 6.2 105.56 2.71
Appendix 31

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

StreamStats

Contributing drainage area,

in square

miles

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85

change

in

elevation

of

longest

flow

path,

in feet

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

86 07178640 10.83 10.83 0.00 41.21 13.30 7.02 70.04 1.13

89 07184000 195.94 195.94 0.00 41.07 3.43 49.11 126.48 0.71

90 07184500 213.21 213.21 0.00 41.73 3.71 43.91 122.23 1.63

91 07184600 27.16 27.16 0.00 42.05 8.27 10.83 67.19 0.34

92 07185500 4.02 4.02 0.00 43.54 27.03 4.11 83.37 0.76

94 07185700 305.59 305.59 0.00 43.19 6.04 49.51 224.11 1.43

96 07186000 1,158.12 1,158.12 0.00 41.87 2.51 100.88 189.56 1.01

97 07186400 228.93 228.93 0.00 42.74 7.75 57.41 333.75 0.92

98 07187000 427.45 427.45 0.00 42.95 5.83 80.14 350.52 1.35

99 07188000 2,515.63 2,515.63 0.00 43.41 2.07 138.62 214.78 1.72

100 07188140 4.88 4.88 0.00 43.35 34.84 4.32 113.00 0.50

101 07188500 40.75 28.67 29.65 43.20 22.59 15.90 269.47 0.82

102 07188900 0.99 0.99 0.00 45.59 128.02 2.18 209.11 1.81

103 07189000 850.68 850.68 0.00 43.39 6.81 75.12 383.74 0.80

104 07190600 71.06 71.06 0.00 41.97 9.61 23.30 167.88 0.21

105 07191000 450.31 450.31 0.00 42.52 4.45 50.76 169.36 0.62

106 07191220 131.55 131.55 0.00 45.27 14.18 29.49 313.56 0.69

107 07191260 16.51 16.51 0.00 44.06 26.63 11.20 223.71 0.35

108 07192000 227.41 217.95 4.16 41.48 3.71 49.15 136.92 0.64

109 07194515 2.10 2.10 0.00 43.99 99.43 3.38 251.93 0.75

110 07195000 129.96 129.96 0.00 44.96 15.77 19.35 228.90 7.78

111 07195200 0.38 0.38 0.00 44.85 127.96 1.04 99.48 1.91

112 07195450 14.31 14.31 0.00 46.04 43.10 7.54 243.83 1.21

113 07195500 629.77 601.19 4.54 45.46 6.59 56.06 277.28 3.26

114 07195800 14.72 14.72 0.00 45.71 38.21 6.78 194.28 0.31
32 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean

annual

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

115 07196000 Flint Creek near Kansas, Okla. 110 45.1 45.4 19.40 23.4 340.47 4.98

116 07196380 Steely Hollow near Tahlequah, Okla. 3.59 45.2 45.2 110.00 2.6 214.50 1.88

117 07196500 Illinois River near Tahlequah, Okla. 959 44.9 45.4 5.33 96.2 384.56 9.65

118 07196900 Baron Fork at Dutch Mills, Ark. 46 46.9 47.6 40.20 11.6 349.74 2.93

119 07197000 Baron Fork at Eldon, Okla. 307 44.9 46.2 13.40 38.2 383.91 4.75

120 07228290 Rough Creek near Thomas, Okla. 10.4 27.8 27.6 41.00 6.3 193.73 3.82

121 07228450 Deer Creek Trib. near Hydro, Okla. 2.31 29.0 29.0 59.00 1.7 75.23 1.25

122 07228930 Worley Creek near Tuttle, Okla. 11.2 33.7 33.7 19.20 6.3 90.72 3.54

123 07228960 Canadian River Trib. near Newcastle, Okla. 3.32 33.8 33.8 49.10 3.8 139.94 4.35

124 07229220 Walnut Creek near Blanchard, Okla. 1.26 33.8 33.8 70.80 1.3 69.03 1.34

125 07229300 Walnut Creek near Purcell, Okla. 202 36.9 34.6 7.72 7.2 41.69 0.26

126 07229420 Julian Creek Trib. near Asher, Okla. 2.28 37.6 37.6 35.00 2.4 63.00 2.53

127 07229430 Arbeca Creek near Allen, Okla. 2.26 39.6 39.6 26.60 2.2 43.89 2.14

128 07230000 Little River below Lake Thunderbird near 

Norman, Okla. 257 36.2 35.1 5.50 24 99.00 2.24

129 07230500 Little River near Tecumseh, Okla. 456 37.8 35.9 4.30 42.8 138.03 4.02

130 07231000 Little River near Sasakwa, Okla. 865 38.4 36.9 3.66 95.9 263.25 10.63

131 07231320 Leader Creek Trib. near Atwood, Okla. 0.72 39.9 39.9 75.20 1.15 64.86 1.84

132 07231560 Middle Creek near Carson, Okla. 7.4 40.6 40.6 21.70 4.6 74.86 2.86

133 07231950 Pine Creek near Higgins, Okla. 9.99 48.1 48.1 62.40 5.1 238.68 2.6

134 07232000 Gaines Creek near Krebs, Okla. 588 43.6 45.4 4.98 45.4 169.57 3.51

135 07232500 Beaver River near Guymon, Okla. 1,175 17.5 16.6 14.80 203 2,253.30 35.07

136 07232650 Aqua Frio Creek near Felt, Okla. 31 16.0 15.6 23.00 15.4 265.65 7.65

137 07233000 Coldwater Creek near Hardesty, Okla. 767 18.5 17.1 11.40 156 1,333.80 31.73

138 07233500 Palo Duro Creek near Spearman, Tex. 440 18.8 17.6 9.83 74 545.57 12.45

139 07234050 North Fork Clear Creek near Balko, Okla. 4.22 20.4 20.4 29.10 4.06 88.61 3.91
Appendix 33

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

StreamStats

Contributing drainage area,

in square

miles

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85

change

in

elevation

of

longest

flow

path,

in feet

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

115 07196000 115.59 115.59 0.00 45.78 15.33 29.36 337.60 2.08

116 07196380 3.84 3.84 0.00 44.83 78.25 3.25 190.51 0.28

117 07196500 950.25 921.68 3.01 44.72 4.54 112.15 381.96 2.50

118 07196900 41.09 41.09 0.00 47.47 39.02 12.36 361.75 0.37

119 07197000 311.58 307.95 1.16 44.93 10.28 46.86 361.20 0.36

120 07228290 10.19 10.19 0.00 27.91 39.26 7.07 208.14 0.17

121 07228450 2.32 2.32 0.00 29.16 62.25 3.30 154.13 1.17

122 07228930 11.22 11.22 0.00 33.89 17.11 7.38 94.65 0.86

123 07228960 3.27 3.27 0.00 33.99 44.15 4.21 139.35 2.23

124 07229220 1.27 1.27 0.00 34.03 67.78 1.70 86.26 0.09

125 07229300 202.13 202.13 0.00 37.23 6.61 36.29 179.92 0.93

126 07229420 2.30 2.30 0.00 37.69 27.35 2.89 59.32 0.22

127 07229430 2.12 2.12 0.00 39.52 30.67 2.78 63.98 0.37

128 07230000 257.09 257.09 0.00 36.23 6.15 34.08 157.26 3.89

129 07230500 462.50 462.50 0.00 37.72 5.54 53.54 222.53 2.26

130 07231000 888.35 834.30 6.08 38.80 3.30 117.99 292.42 1.31

131 07231320 0.73 0.73 0.00 40.29 75.47 1.40 79.09 0.47

132 07231560 7.34 7.34 0.00 40.48 27.16 6.17 125.75 0.12

133 07231950 10.83 10.83 0.00 47.97 48.66 6.24 227.77 0.08

134 07232000 585.08 529.04 9.58 43.91 3.07 65.72 151.51 0.41

135 07232500 1,611.74 1,611.74 0.00 17.39 14.03 227.04 2389.03 0.24

136 07232650 31.52 31.52 0.00 16.00 17.89 19.08 255.92 0.37

137 07233000 1,028.81 1,028.81 0.00 18.79 9.71 185.31 1349.31 0.32

138 07233500 624.68 624.68 0.00 18.66 8.27 108.73 674.44 0.49

139 07234050 4.30 4.30 0.00 20.50 25.53 5.25 100.56 0.14
34 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean

annual

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

140 07234100 Clear Creek near Elmwood, Okla. 170 21.2 20.6 15.24 26.42 301.98 4.11

141 07234150 White Woman Creek Trib. near Darrouzett, Tex. 4.03 22.6 22.6 7.59 2.16 12.30 1.16

142 07234290 Clear Creek Trib. near Catesby, Okla. 8.57 22.3 22.3 34.70 4.1 106.70 1.96

143 07235000 Wolf Creek at Lipscomb, Tex. 475 21.2 20.9 10.30 50 386.25 5.26

144 07235700 Little Wolf Creek Trib. near Gage, Okla. 17.8 21.7 22.0 23.00 8 138.00 3.6

145 07236000 Wolf Creek near Fargo, Okla. 1,386.00 22.8 21.7 8.96 89.3 600.10 5.75

146 07237750 Cottonwood Creek near Vici, Okla. 11.8 25.4 25.6 38.30 7.2 206.82 4.39

147 07237800 Bent Creek near Seiling, Okla. 139 25.6 25.4 16.50 20 247.50 2.88

148 07239050 North Canadian River Trib. near Eagle City, Okla. 0.52 27.9 27.9 112.00 0.92 77.28 1.63

149 07241880 Sand Creek near Cromwell, Okla. 9.48 38.2 38.2 30.60 5.8 133.11 3.55

150 07242160 Alabama Creek near Weleetka, Okla. 16.5 39.6 39.4 26.80 7.8 156.78 3.69

151 07243000 Dry Creek near Kendrick, Okla. 69 35.3 35.5 11.90 9 80.33 1.17

152 07243500 Deep Fork near Beggs, Okla. 2,018.00 39.5 36.4 2.60 145 282.75 10.42

153 07243550 Adams Creek near Beggs, Okla. 5.9 39.6 39.5 32.20 4.4 106.26 3.28

154 07244000 Deep Fork near Dewar, Okla. 2,307.00 40.3 36.8 1.89 186 263.66 15

155 07244790 Brooken Creek near Enterprise, Okla. 5.66 43.7 44.4 40.50 5 151.88 4.42

156 07245500 Sallisaw Creek near Sallisaw, Okla. 182 44.3 45.1 15.20 35 399.00 6.73

157 07246610 Pecan Creek near Spiro, Okla. 0.9 44.5 44.3 42.00 2 63.00 4.44

158 07246630 Big Black Fox Creek near Long, Okla. 5.32 45.7 45.8 68.50 3.3 169.54 2.05

159 07247000 Poteau River at Cauthron, Ark. 203 51.7 51.7 9.79 33.6 246.71 5.56

160 07247500 Fourche Maline near Red Oak, Okla. 122 48.0 48.4 3.91 31.8 93.25 8.29

161 07249000 Poteau River at Poteau, Okla. 1,240.00 45.5 49.2 3.60 100 270.00 8.06

162 07249300 James Fork near Midland, Ark. 44 46.1 49.3 46.50 13 453.38 3.84

163 07249400 James Fork near Hackett, Ark. 147 44.4 46.6 14.20 26.9 286.49 4.92

164 07249500 Cove Creek near Lee Creek, Ark. 35.3 48.3 48.8 37.00 13.4 371.85 5.09
Appendix 35

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

StreamStats

Contributing drainage area,

in square

miles

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85

change

in

elevation

of

longest

flow

path,

in feet

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

140 07234100 161.87 161.87 0.00 21.08 11.38 36.39 310.56 0.23

141 07234150 4.10 4.10 0.00 22.59 16.30 5.44 66.46 0.26

142 07234290 8.56 8.56 0.00 22.31 34.18 4.86 124.65 0.11

143 07235000 543.99 543.94 0.00 21.12 7.58 74.06 421.16 0.25

144 07235700 17.53 17.53 0.00 21.40 17.90 10.55 141.68 0.20

145 07236000 1,473.01 1,472.96 0.00 22.80 6.54 131.35 644.61 0.29

146 07237750 11.65 11.65 0.00 25.13 40.31 8.78 265.55 0.50

147 07237800 129.00 129.00 0.00 25.40 9.77 32.07 234.89 0.19

148 07239050 0.55 0.55 0.00 27.60 90.87 1.42 96.79 1.25

149 07241880 9.52 9.52 0.00 38.37 24.37 7.07 129.29 0.11

150 07242160 16.21 16.21 0.00 39.84 19.12 9.79 140.39 0.26

151 07243000 68.37 65.66 3.97 35.40 13.76 12.60 129.99 0.26

152 07243500 2,004.26 1,563.16 22.01 39.59 2.41 181.83 328.98 1.51

153 07243550 5.69 5.69 0.00 39.41 37.72 6.08 171.95 0.82

154 07244000 2,295.99 1,814.56 20.97 40.14 1.98 225.74 335.89 1.45

155 07244790 5.95 5.95 0.00 43.73 34.94 6.20 162.56 0.65

156 07245500 181.11 69.60 61.57 45.07 13.25 40.45 401.93 0.30

157 07246610 0.92 0.92 0.00 44.67 44.53 2.51 83.93 0.42

158 07246630 5.51 5.51 0.00 45.08 55.79 4.43 185.33 0.57

159 07247000 203.56 120.10 41.00 46.84 8.89 36.20 241.33 0.80

160 07247500 120.35 50.86 57.74 46.74 14.67 32.70 359.91 0.70

161 07249000 1,250.72 1,011.33 19.14 46.19 2.82 104.71 221.12 0.53

162 07249300 43.81 43.81 0.00 44.85 52.27 14.47 567.18 0.32

163 07249400 146.67 146.67 0.00 45.01 16.23 29.06 353.85 0.66

164 07249500 34.84 34.84 0.00 48.85 34.01 15.25 388.93 0.14
36 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean

annual

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

165 07249650 Mountain Fork near Evansville, Ark. 8.15 47.9 48.9 72.80 5.3 289.38 3.45

166 07250000 Lee Creek near Van Buren, Ark. 426 45.2 47.6 17.40 53.2 694.26 6.64

169 07299670 Groesbeck Creek at S.H. 6 near Quannah, Tex. 303 24.6 23.2 7.54 44.2 249.95 6.45

170 07299705 Bitter Creek near Hollis, Okla. 11.1 23.3 23.2 40.80 6.6 201.96 3.92

171 07300000 Salt Fork Red River near Wellington, Tex. 1,013.00 22.1 22.1 16.50 84 1,039.50 6.97

172 07300150 Bear Creek near Vinson, Okla. 7.24 23.1 23.1 41.90 5 157.13 3.45

173 07300500 Salt Fork Red River at Mangum, Okla. 1,357.00 25.9 22.3 13.80 132 1,366.20 12.84

174 07301110 Salt Fork Red River near Elmer, Okla. 1,669.00 25.7 23.1 13.00 164 1,599.00 16.12

175 07301455 Turkey Creek near Erick, Okla. 19.8 24.6 24.7 17.70 7 92.92 2.47

176 07301480 Short Creek near Sayre, Okla. 9.12 24.2 24.2 31.10 6.7 156.28 4.92

177 07301500 North Fork Red River near Carter, Okla. 1,938.00 26.1 22.8 12.50 110 1,031.25 6.24

178 07303400 Elm Fork of North Fork Red River near Carl, 

Okla. 416 23.5 22.8 19.40 53 771.15 6.75

179 07303450 Deer Creek near Plainview, Okla. 27.8 24.2 24.5 34.00 10.2 260.10 3.74

180 07303500 Elm Fork of North Fork Red River near Mangum, 

Okla. 838 26.0 23.8 14.10 79.2 837.54 7.49

181 07309480 Canyon Creek near Medicine Park, Okla. 3.35 30.1 30.3 59.10 3 132.98 2.69

182 07311000 East Cache Creek near Walters, Okla. 675 33.3 30.4 6.75 66.9 338.68 6.63

183 07311200 Blue Beaver Creek near Cache, Okla. 24.6 29.6 30.1 36.40 16.2 442.26 10.67

184 07311420 Deadman Creek Trib. at Manitou, Okla. 2.57 27.7 27.7 46.70 3.25 113.83 4.11

185 07311500 Deep Red Creek near Randlett, Okla. 617 30.7 28.8 8.51 64.2 409.76 6.68

186 07312850 Nine Mile Beaver Creek near Elgin, Okla. 6.29 31.0 31.1 42.20 4.2 132.93 2.8

187 07312950 Little Beaver Creek near Marlow, Okla. 35.4 33.1 33.2 23.80 8.1 144.59 1.85

188 07313000 Little Beaver Creek near Duncan, Okla. 158 32.8 32.9 12.10 23 208.73 3.35

189 07313500 Beaver Creek near Waurika, Okla. 563 31.9 32.4 4.79 66.2 237.82 7.78

190 07313600 Cow Creek near Waurika, Okla. 193 31.7 33.1 5.00 38.6 144.75 7.72

192 07315680 Cottonwood Creek Trib. near Loco, Okla. 1.74 35.1 35.1 50.60 2 75.90 2.3
Appendix 37

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

StreamStats

Contributing drainage area,

in square

miles

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85

change

in

elevation

of

longest

flow

path,

in feet

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

165 07249650 8.40 8.40 0.00 48.23 128.70 6.91 666.79 0.15

166 07250000 437.97 437.97 0.00 42.94 15.12 60.64 687.45 0.18

169 07299670 320.00 320.00 0.00 24.44 7.10 48.08 256.15 0.50

170 07299705 11.48 11.48 0.00 23.28 34.08 7.74 197.80 0.09

171 07300000 979.49 979.43 0.00 22.00 15.06 97.15 1097.15 0.13

172 07300150 7.18 7.18 0.00 23.06 38.79 5.59 162.58 0.04

173 07300500 1,319.45 1,319.39 0.00 25.68 11.66 160.00 1399.73 0.16

174 07301110 1,847.90 1,757.42 4.89 25.66 9.77 205.21 1504.22 0.25

175 07301455 21.87 21.87 0.00 24.66 17.30 8.85 114.75 0.76

176 07301480 9.28 9.28 0.00 24.27 31.62 8.46 200.59 0.15

177 07301500 2,072.51 1,834.19 11.50 26.19 9.57 213.45 1531.73 0.26

178 07303400 437.96 437.96 0.00 23.34 15.76 74.04 875.21 0.30

179 07303450 26.78 26.78 0.00 24.23 25.58 13.26 254.29 0.06

180 07303500 846.33 846.33 0.00 25.72 10.87 115.17 939.18 0.21

181 07309480 3.39 3.39 0.00 30.31 56.74 3.56 151.58 0.19

182 07311000 693.50 693.50 0.00 33.57 5.07 110.08 418.56 2.40

183 07311200 24.67 24.67 0.00 29.41 35.58 17.37 463.50 0.35

184 07311420 2.58 2.58 0.00 27.82 31.93 4.47 107.04 0.81

185 07311500 604.08 485.49 19.63 30.79 5.92 82.29 365.15 0.36

186 07312850 6.36 6.36 0.00 31.09 39.94 4.93 147.77 2.17

187 07312950 34.86 34.86 0.00 33.39 22.37 8.96 150.40 0.29

188 07313000 156.58 156.58 0.00 32.99 9.11 29.34 200.51 0.64

189 07313500 564.36 564.36 0.00 31.58 3.98 71.25 212.64 0.38

190 07313600 192.66 144.17 25.17 31.00 6.32 44.09 209.11 2.21

192 07315680 1.81 1.81 0.00 34.90 56.06 2.45 103.06 0.02
38 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean

annual

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

193 07315700 Mud Creek near Courtney, Okla. 572 34.2 33.5 6.50 45 219.38 3.54

194 07315880 Demijohn Creek near Wilson, Okla. 5.74 35.5 35.4 43.40 3.2 104.16 1.78

195 07316130 Wilson Creek near McMilllian, Okla. 2.97 38.2 38.2 47.50 3.6 128.25 4.36

196 07316140 Brier Creek near Powell, Okla. 12 39.7 39.9 13.60 6.4 65.28 3.41

197 07316500 Washita River near Cheyenne, Okla. 794 24.0 22.6 10.90 82.1 671.17 8.49

198 07317500 Sandstone Creek SWS 16A near Cheyenne, Okla. 5.16 24.8 24.7 57.60 3.33 143.86 2.15

199 07318500 Sandstone Creek SWS 14 near Cheyenne, Okla. 1.02 25.0 25.0 147.00 1.35 148.84 1.79

200 07319000 Sandstone Creek SWS 17 near Cheyenne, Okla. 10.13 24.8 24.4 53.20 5.8 231.42 3.32

201 07320000 Sandstone Creek SWS 10A near Elk City, Okla. 2.87 25.4 25.2 58.00 2.13 92.66 1.58

202 07321500 Sandstone Creek SWS 3 near Elk City, Okla. 0.62 25.4 25.4 94.10 1.35 95.28 2.94

203 07322000 Sandstone Creek SWS 9 near Elk City, Okla. 3.5 25.3 25.3 67.40 4.45 224.95 5.66

204 07324000 Sandstone Creek SWS 1 near Cheyenne, Okla. 5.33 25.3 25.3 60.70 3.8 173.00 2.71

205 07325000 Washita River near Clinton, Okla. 1,977.00 29.7 24.5 6.68 179 896.79 16.21

206 07325850 Lake Creek near Eakly, Okla. 52 29.6 29.5 21.50 12.8 206.40 3.15

207 07326000 Cobb Creek near Fort Cobb, Okla. 313 29.6 29.4 8.03 36.5 219.82 4.26

208 07327150 Salt Creek near Chickasha, Okla. 23.76 32.0 32.6 15.90 11.6 138.33 5.66

209 07327420 West Bitter Creek near Tabler, Okla. 60.4 31.9 33.1 12.30 17.5 161.44 5.07

210 07327440 East Bitter Creek near Tabler, Okla. 35.2 32.4 33.2 17.40 12.25 159.86 4.26

211 07327490 Little Washita River near Ninnekah, Okla. 208 32.0 31.6 6.80 30.8 157.08 4.56

212 07329000 Rush Creek at Purdy, Okla. 145 35.8 34.2 10.50 28.5 224.44 5.6

213 07329500 Rush Creek near Maysville, Okla. 206 36.2 34.8 9.00 40.4 272.70 7.92

214 07329810 Honey Creek near Davis, Okla. 18.7 37.3 37.6 49.80 11.5 429.53 7.07

215 07329900 Rock Creek near Dougherty, Okla. 138 37.3 38.6 20.90 25 391.88 4.53

216 07330500 Caddo Creek near Ardmore, Okla. 298 36.3 36.3 8.39 39.8 250.44 5.32

217 07332070 Rock Creek near Achille, Okla. 0.72 41.0 41.0 35.60 0.9 24.03 1.13
Appendix 39

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; 

SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

StreamStats

Contributing drainage area,

in square

miles

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85

change

in

elevation

of

longest

flow

path,

in feet

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

193 07315700 574.41 574.41 0.00 34.00 3.89 67.94 198.22 0.16

194 07315880 6.44 6.44 0.00 35.39 30.34 4.57 103.91 0.39

195 07316130 2.95 2.95 0.00 37.88 43.67 4.08 133.52 0.22

196 07316140 11.99 11.99 0.00 39.81 25.65 7.75 149.18 0.26

197 07316500 762.59 246.53 67.67 23.95 8.96 101.27 680.73 0.17

198 07317500 9.68 0.00 99.99 24.67 45.39 7.08 241.04 0.15

199 07318500 1.01 0.07 92.58 24.95 116.64 2.01 175.58 0.04

200 07319000 11.11 0.02 99.83 24.84 51.32 7.10 273.20 0.25

201 07320000 2.79 0.00 99.90 25.25 75.30 2.87 161.92 0.05

202 07321500 0.65 0.00 99.45 25.44 107.51 1.59 127.92 0.02

203 07322000 3.36 0.00 99.86 25.44 60.09 5.78 260.35 0.02

204 07324000 5.39 0.06 98.80 25.56 46.93 4.61 162.27 0.04

205 07325000 1,948.58 836.48 57.07 29.99 6.79 193.68 986.94 0.20

206 07325850 52.46 52.46 0.00 29.72 15.90 14.61 174.23 0.18

207 07326000 310.72 262.43 15.54 29.50 7.23 42.81 232.22 0.25

208 07327150 23.79 23.79 0.00 31.92 13.17 12.57 124.18 0.50

209 07327420 59.70 41.85 29.90 31.87 10.89 20.69 168.98 0.52

210 07327440 35.38 28.82 18.54 32.41 12.23 14.90 136.60 0.20

211 07327490 207.96 106.23 48.92 32.19 8.52 33.98 217.25 0.64

212 07329000 139.68 46.96 66.38 35.07 9.97 32.90 246.02 0.36

213 07329500 201.75 101.88 49.50 35.87 8.78 47.53 312.88 0.34

214 07329810 18.75 18.75 0.00 37.89 41.48 13.81 429.61 0.91

215 07329900 136.76 96.75 29.26 38.16 13.71 28.85 296.73 1.21

216 07330500 296.30 164.87 44.36 36.08 5.81 51.07 222.71 0.60

217 07332070 0.71 0.71 0.00 41.22 27.10 1.46 29.60 0.36
40 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean

annual

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

218 07332400 Blue River at Milburn, Okla. 203 40.9 39.6 12.80 43.7 419.52 9.41

219 07332500 Blue Creek near Blue, Okla. 476 42.2 40.8 5.99 112 503.16 26.35

220 07333500 Chickasaw Creek near Stringtown, Okla. 32.7 41.9 43.6 24.20 10.6 192.39 3.44

221 07333800 McGee Creek near Stringtown, Okla. 86.6 44.9 46.1 8.33 22.3 139.32 5.74

222 07334000 Muddy Boggy Creek near Farris, Okla. 1,087.00 43.1 42.2 3.73 97.7 273.32 8.78

223 07335000 Clear Boggy Creek near Caney, Okla. 720 42.2 40.1 6.26 63.9 300.01 5.67

224 07335300 Muddy Boggy Creek near Unger, Okla. 2,273.00 43.9 41.7 2.29 136.8 234.95 8.23

225 07335310 Rock Creek near Boswell, Okla. 0.94 43.8 43.8 22.60 1.3 22.04 1.8

226 07335320 Bokchito Creek near Soper, Okla. 16.6 44.9 45.4 4.60 16.6 57.27 16.6

227 07335700 Kiamichi River near Big Cedar, Okla. 40.1 53.9 56.2 58.90 11.9 525.68 3.53

228 07335760 Kiamichi River Trib. near Albion, Okla. 1.43 49.5 49.6 246.00 2.5 461.25 4.37

229 07336500 Kiamichi River near Belzoni, Okla. 1,423.00 45.8 48.8 3.08 121 279.51 10.29

230 07336520 Frazier Creek near Oleta, Okla. 19.4 47.2 49.1 57.60 7.4 319.68 2.82

231 07336710 Rock Creek near Sawyer, Okla. 3.39 45.9 45.8 34.40 2.6 67.08 1.99

232 07336750 Little Pine Creek near Kanawha, Tex. 75.4 46.4 46.3 5.82 20.83 90.92 5.75

233 07336780 Perry Creek near Idabel, Okla. 7.53 47.6 47.6 31.60 3.2 75.84 1.36

234 07336785 Bokchito Creek near Garvin, Okla. 2.96 47.6 47.6 26.30 3.6 71.01 4.38

235 07336800 Pecan Bayou near Clarksville, Tex. 100 46.2 46.9 4.58 20.9 71.79 4.37

236 07337220 Big Branch near Ringold, Okla. 1.99 49.0 49.0 84.80 2.2 139.92 2.43

237 07337500 Little River near Wright City, Okla. 645 47.6 50.3 7.50 76.4 429.75 9.05

238 07337900 Glover River near Glover, Okla. 315 49.9 51.6 14.30 42.5 455.81 5.73

239 07338500 Little River below Lukfata Creek near 

Idabel, Okla. 1,226.00 47.3 50.5 5.13 114 438.62 10.6

240 07338520 Yanubbee Creek near Broken Bow, Okla. 9.1 50.0 50.9 66.00 4.9 242.55 2.64

241 07338700 Twomile Creek near Hatfield, Ark. 16.1 54.2 54.9 48.90 9.5 348.41 5.61

242 07338780 Mountain Fork Trib. near Smithville, Okla. 0.68 53.8 53.8 91.40 2.2 150.81 7.12
Appendix 41

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, 

Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

StreamStats

Contributing drainage area,

in square

miles

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85

change

in

elevation

of

longest

flow

path,

in feet

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

218 07332400 203.19 201.52 0.82 41.02 10.26 58.16 447.57 0.21

219 07332500 477.45 475.78 0.35 42.14 6.98 106.84 559.43 0.63

220 07333500 32.62 32.62 0.00 41.44 25.39 13.71 261.18 0.09

221 07333800 88.76 88.76 0.00 45.24 6.10 30.64 140.30 0.09

222 07334000 1,088.92 987.26 9.34 42.89 3.18 124.69 297.73 0.28

223 07335000 713.37 406.83 42.97 41.94 3.37 90.84 229.77 0.38

224 07335300 2,261.85 1,844.45 18.45 44.08 2.40 166.16 299.44 0.29

225 07335310 1.01 1.01 0.00 43.64 33.38 1.98 49.51 0.07

226 07335320 17.48 17.48 0.00 45.01 15.74 9.52 112.39 0.21

227 07335700 39.63 39.63 0.00 56.32 54.89 12.79 526.40 0.13

228 07335760 1.51 1.51 0.00 50.58 342.93 3.60 924.74 0.22

229 07336500 1,415.94 1,391.77 1.71 46.23 3.35 137.13 344.84 0.27

230 07336520 18.54 18.54 0.00 47.45 25.32 10.57 200.69 0.13

231 07336710 3.33 3.33 0.00 46.68 33.06 4.01 99.36 0.45

232 07336750 75.27 75.27 0.00 47.21 5.24 23.93 94.01 0.71

233 07336780 7.60 7.60 0.00 48.09 22.72 4.70 80.08 1.13

234 07336785 2.89 2.89 0.00 48.09 22.67 4.28 72.70 0.51

235 07336800 98.91 98.91 0.00 46.04 4.30 32.12 103.60 0.50

236 07337220 1.99 1.99 0.00 49.77 72.35 2.42 131.36 0.48

237 07337500 648.22 648.22 0.00 49.37 9.74 92.73 677.61 0.31

238 07337900 320.28 320.28 0.00 50.42 13.52 52.57 533.05 0.57

239 07338500 1,228.14 1,228.14 0.00 48.35 5.67 132.74 564.37 0.46

240 07338520 9.03 9.03 0.00 50.64 42.27 6.05 191.64 0.68

241 07338700 16.22 16.22 0.00 53.59 44.03 10.78 355.87 0.28

242 07338780 0.65 0.65 0.00 54.05 69.96 2.67 140.12 3.25
42 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Contributing

drainage

area

in

square 

miles

Outlet

mean

annual

precipitation 

(1961-

1990),

in

inches

Areaweighted mean

annual

precipitation

(1961-

1990),

in

inches

10–85

channel

slope,

in

feet

per

mile

Stream

length,

in

miles

10–85 

change

in

elevation

of

stream,

in

feet 

Stream

shape

factor,

dimensionless

243 07339000 Mountain Fork near Eagletown, Okla. 787 50.0 53.7 6.63 87.5 435.09 9.73

244 07339500 Rolling Fork near DeQueen, Ark. 182 52.0 53.4 18.60 35.1 489.65 6.77

245 07339800 Pepper Creek near DeQueen, Ark. 6.41 52.7 52.7 47.70 6.4 228.96 6.39

246 07340200 West Flat Creek near Foreman, Ark. 10.6 50.0 50.1 12.00 6.78 61.02 4.34

247 07340300 Cossatot River near Vandervoort, Ark. 89.6 55.2 58.4 29.90 18.4 412.62 3.78

248 07340500 Cossatot River near DeQueen, Ark. 360 52.6 56.0 15.50 53.7 624.26 8.01

249 07340530 Mill Slough Trib. near Locksburg, Ark. 0.64 51.7 51.7 60.50 1.97 89.39 6.06

250 07341000 Saline River near Dierks, Ark. 121 53.3 56.9 21.50 35.9 578.89 10.65

MAXIMUM 787.00 55.20 58.40 60.50 87.50 624.26 10.65

MINIMUM 0.64 50.00 50.10 6.63 1.97 61.02 3.78
Appendix 43

Appendix 1. Basin characteristics computed by Tortorelli (1997) and StreamStats.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, 

Subwatershed; NRCS FWR, Natural Resources Conservation Service floodwater retarding]

Site

no.

(Tortorelli,

1997)

Station

no.

StreamStats

Contributing drainage area,

in square

miles

(CONTDA)

Contributing drainage area 

that

is uregulated

by NRCS

FWR

structures, in 

square 

miles 

(DAUNREG)

Contributing 

drainage 

area that is 

regulated

by NRCS 

FWR 

structures, 

in percent 

(NRCSPCT)

Outlet

mean

annual

precipitation

(1961-1990), 

in inches 

(PRCOUT61)

10–85

channel

slope,

in

feet

per

mile 

(CSL10_85fm)

Length

of

longest

flow

path,

in

miles

(L)

10–85

change

in

elevation

of

longest

flow

path,

in feet

(∆ELEV)

Impervious

area,

in

percent

(IMPNLCD01)

243 07339000 799.80 799.80 0.00 50.57 6.82 97.69 499.58 0.46

244 07339500 183.37 183.37 0.00 52.19 17.52 42.87 563.25 0.65

245 07339800 6.27 6.27 0.00 52.74 41.72 7.49 234.34 0.61

246 07340200 10.65 10.65 0.00 50.34 10.62 7.80 62.12 0.26

247 07340300 89.10 89.10 0.00 56.37 28.55 21.41 458.41 0.11

248 07340500 361.22 361.22 0.00 52.79 15.46 60.11 696.82 0.39

249 07340530 0.69 0.69 0.00 52.25 55.83 2.16 90.62 5.62

250 07341000 120.21 120.21 0.00 54.17 20.90 40.78 639.09 0.47

799.80 799.80 0.00 56.37 55.83 97.69 696.82 5.62

0.69 0.69 0.00 50.34 6.82 2.16 62.12 0.11
44 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data. 

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet 

per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

17 07148100 Grouse Creek near Dexter, Kans. 4,225 8,946 13,006 19,408 25,178 31,616 49,669

18 07148350 Salt Fork Arkansas River near Winchester, 

Okla.

6,342 15,794 24,856 40,177 54,828 71,861 122,238

19 07148400 Salt Fork Arkansas River near Alva, Okla. 7,847 19,049 29,589 47,205 63,911 83,202 139,659

22 07150580 Sand Creek Trib. near Kremlin, Okla. 581 1,290 1,932 2,973 3,928 5,005 8,146

23 07150870 Salt Fork Arkansas River Trib. near Eddy, Okla. 316 690 1,026 1,568 2,061 2,614 4,229

24 07151500 Chikaskia River near Corbin, Kans. 8,758 19,454 28,897 44,057 57,959 73,659 118,037

26 07152000 Chikaskia River near Blackwell, Okla. 16,545 35,745 52,296 78,524 102,386 129,140 203,604

27 07152360 Elm Creek near Foraker, Okla. 1,297 2,726 3,964 5,923 7,687 9,649 15,234

28 07152410 Rock Creek near Shidler, Okla. 962 2,036 2,976 4,472 5,828 7,337 11,676

29 07152520 Black Bear Creek Trib. near Garber, Okla. 203 450 675 1,041 1,377 1,755 2,875

30 07152842 Subwatershed W-4 near Morrison, Okla. 119 262 393 606 802 1,022 1,678

31 07152846 Subwatershed W-3 near Morrison, Okla. 75 167 251 388 515 657 1,085

32 07153000 Black Bear Creek at Pawnee, Okla. 8,652 17,855 25,560 37,531 48,198 60,038 92,567

33 07153500 Dry Cimarron River near Guy, N. Mex. 2,353 7,279 12,790 23,109 33,802 46,970 89,565

34 07154400 Carrizozo Creek near Kenton, Okla. 903 2,738 4,773 8,556 12,438 17,195 32,562

35 07154500 Cimarron River near Kenton, Okla. 3,322 10,074 17,499 31,236 45,327 62,594 117,689

36 07155000 Cimarron River above Ute Creek near Boise 

City, Okla.

3,733 11,838 21,005 38,291 56,283 78,604 150,776

37 07155100 Cold Springs Creek near Wheeless, Okla. 198 605 1,061 1,912 2,784 3,855 7,354

45 07157500 Crooked Creek near Nye, Kans. 3,721 9,728 15,666 25,878 35,715 47,328 82,069

46 07157550 West Fork Creek near Knowles, Okla. 225 606 1,000 1,699 2,387 3,203 5,772

47 07157900 Cavalry Creek at Coldwater, Kans. 839 2,082 3,284 5,318 7,246 9,489 16,202

48 07157960 Buffalo Creek near Lovedale, Okla. 3,947 9,783 15,372 24,804 33,790 44,229 75,137

49 07158020 Cimarron River Trib. near Lone Wolf, Okla. 317 774 1,217 1,967 2,679 3,502 5,998

50 07158080 Sand Creek Trib. near Waynoka, Okla. 182 451 716 1,168 1,601 2,103 3,647

51 07158180 Salt Creek Trib. near Okeene, Okla. 568 1,321 2,023 3,185 4,270 5,508 9,181

52 07158400 Salt Creek near Okeene, Okla. 3,830 8,837 13,420 20,936 27,948 35,932 59,116

53 07158500 Preacher Creek near Dover, Okla. 794 1,789 2,693 4,166 5,520 7,055 11,528

54 07158550 Turkey Creek Trib. near Goltry, Okla. 389 900 1,378 2,165 2,896 3,731 6,206

55 07159000 Turkey Creek near Drummond, Okla. 3,965 8,812 13,111 20,016 26,323 33,454 53,711

56 07159200 Kingfisher Creek near Kingfisher, Okla. 3,166 7,204 10,863 16,820 22,329 28,586 46,637
Appendix 45

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

StreamStats

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet 

per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

17 07148100 Grouse Creek near Dexter, Kans. 4,415 9,293 13,471 20,046 25,962 32,553 50,999

18 07148350 Salt Fork Arkansas River near Winchester, 

Okla.

5,873 14,468 22,634 36,352 49,378 64,492 108,903

19 07148400 Salt Fork Arkansas River near Alva, Okla. 7,142 17,156 26,494 41,998 56,592 73,414 122,311

22 07150580 Sand Creek Trib. near Kremlin, Okla. 554 1,227 1,832 2,812 3,706 4,715 7,649

23 07150870 Salt Fork Arkansas River Trib. near Eddy, Okla. 330 719 1,068 1,630 2,142 2,716 4,392

24 07151500 Chikaskia River near Corbin, Kans. 8,842 19,647 29,187 44,503 58,548 74,411 119,246

26 07152000 Chikaskia River near Blackwell, Okla. 16,215 35,060 51,306 77,051 100,461 126,720 199,782

27 07152360 Elm Creek near Foraker, Okla. 1,304 2,717 3,933 5,847 7,565 9,471 14,875

28 07152410 Rock Creek near Shidler, Okla. 963 2,027 2,956 4,430 5,764 7,246 11,498

29 07152520 Black Bear Creek Trib. near Garber, Okla. 190 418 625 959 1,265 1,608 2,619

30 07152842 Subwatershed W-4 near Morrison, Okla. 120 259 386 591 778 988 1,608

31 07152846 Subwatershed W-3 near Morrison, Okla. 64 140 211 327 434 553 914

32 07153000 Black Bear Creek at Pawnee, Okla. 8,005 16,505 23,616 34,654 44,471 55,372 85,292

33 07153500 Dry Cimarron River near Guy, N. Mex. 1,855 5,905 10,522 19,272 28,407 39,749 76,774

34 07154400 Carrizozo Creek near Kenton, Okla. 888 2,662 4,613 8,214 11,886 16,375 30,784

35 07154500 Cimarron River near Kenton, Okla. 3,538 10,624 18,361 32,604 47,156 64,943 121,437

36 07155000 Cimarron River above Ute Creek near Boise 

City, Okla.

3,611 11,566 20,621 37,770 55,673 77,946 150,197

37 07155100 Cold Springs Creek near Wheeless, Okla. 193 588 1,031 1,858 2,704 3,744 7,141

45 07157500 Crooked Creek near Nye, Kans. 3,750 9,773 15,712 25,910 35,718 47,289 81,850

46 07157550 West Fork Creek near Knowles, Okla. 229 617 1,018 1,728 2,426 3,255 5,861

47 07157900 Cavalry Creek at Coldwater, Kans. 935 2,314 3,646 5,897 8,032 10,514 17,940

48 07157960 Buffalo Creek near Lovedale, Okla. 3,665 9,175 14,490 23,497 32,103 42,128 71,914

49 07158020 Cimarron River Trib. near Lone Wolf, Okla. 295 720 1,133 1,831 2,492 3,258 5,579

50 07158080 Sand Creek Trib. near Waynoka, Okla. 187 464 738 1,207 1,655 2,176 3,778

51 07158180 Salt Creek Trib. near Okeene, Okla. 498 1,145 1,743 2,725 3,633 4,667 7,711

52 07158400 Salt Creek near Okeene, Okla. 3,137 7,172 10,834 16,798 22,309 28,582 46,657

53 07158500 Preacher Creek near Dover, Okla. 758 1,721 2,601 4,038 5,363 6,867 11,263

54 07158550 Turkey Creek Trib. near Goltry, Okla. 367 845 1,287 2,015 2,688 3,455 5,721

55 07159000 Turkey Creek near Drummond, Okla. 3,871 8,562 12,704 19,338 25,374 32,195 51,504

56 07159200 Kingfisher Creek near Kingfisher, Okla. 3,030 6,799 10,174 15,622 20,615 26,273 42,452
46 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet per 

second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

57 07159810 Watershed W-IV near Guthrie, Okla. 79 175 264 409 544 696 1,152

58 07160500 Skeleton Creek near Lovell, Okla. 6,023 13,325 19,774 30,121 39,592 50,277 80,561

59 07160550 West Beaver Creek near Orlando, 

Okla.

941 2,078 3,099 4,750 6,264 7,969 12,919

60 07163000 Council Creek near Stillwater, Okla. 1,754 3,708 5,403 8,088 10,514 13,215 20,892

61 07163020 Corral Creek near Yale, Okla. 491 1,051 1,549 2,346 3,073 3,883 6,242

62 07165550 Snake Creek near Bixby, Okla. 3,197 6,424 9,124 13,316 17,058 21,164 32,628

72 07170700 Big Hill Creek near Cherryvale, Kans. 2,532 4,898 6,822 9,754 12,319 15,115 22,791

73 07170800 Mud Creek near Mound Valley, Kans. 814 1,581 2,216 3,193 4,053 4,989 7,612

74 07171700 Spring Branch near Cedar Vale, Kans. 495 1,064 1,570 2,383 3,125 3,953 6,364

75 07171800 Cedar Creek Trib. near Hooser, Kans. 214 464 691 1,059 1,399 1,777 2,901

76 07172000 Caney River near Elgin, Kans. 9,209 18,635 26,441 38,507 49,241 61,076 93,532

77 07173000 Caney River near Hulah, Okla. 10,778 22,465 32,325 47,733 61,565 76,937 119,383

78 07174200 Little Caney River below Cotton 

Creek near Copan, Okla.

9,423 19,453 27,881 41,021 52,800 65,848 101,897

79 07174570 Dry Hollow near Pawhuska, Okla. 426 892 1,301 1,952 2,542 3,196 5,095

80 07174600 Sand Creek at Okesa, Okla. 4,873 9,969 14,257 20,939 26,919 33,522 51,893

81 07174720 Hogshooter Creek Trib. near Bartlesville, Okla.

296 609 882 1,314 1,702 2,130 3,370

82 07176500 Bird Creek at Avant, Okla. 8,050 16,189 22,902 33,246 42,415 52,514 80,153

83 07176800 Candy Creek near Wolco, Okla. 2,094 4,252 6,074 8,911 11,443 14,233 22,056

84 07177000 Hominy Creek near Skiatook, Okla. 7,772 15,717 22,303 32,481 41,527 51,502 78,890

85 07177500 Bird Creek near Sperry, Okla. 13,651 27,123 38,072 54,818 69,583 85,813 129,684

86 07178640 Bull Creek near Inola, Okla. 1,176 2,307 3,242 4,680 5,943 7,324 11,170

89 07184000 Lightning Creek near McCune, Kans. 5,883 11,320 15,670 22,247 27,963 34,202 51,021

90 07184500 Labette Creek near Oswego, Kans. 6,527 12,588 17,450 24,816 31,241 38,250 57,192

91 07184600 Fly Creek near Faulkner, Kans. 2,046 3,943 5,484 7,828 9,873 12,100 18,216

92 07185500 Stahl Creek near Miller, Mo. 605 1,133 1,557 2,195 2,742 3,335 4,961

94 07185700 Spring River at LaRussell, Mo. 10,025 19,179 26,483 37,544 47,237 57,763 86,190

96 07186000 Spring River near Waco, Mo. 20,105 38,675 53,418 75,711 95,254 116,534 173,447

97 07186400 Center Creek near Carterville, Mo. 8,201 15,713 21,721 30,824 38,793 47,454 70,884

98 07187000 Shoal Creek above Joplin, Mo. 11,520 22,066 30,469 43,188 54,329 66,438 99,056

99 07188000 Spring River near Quapaw, Okla. 34,074 64,722 88,728 124,814 156,380 190,638 281,384
Appendix 47

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

StreamStats

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet per 

second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

57 07159810 Watershed W-IV near Guthrie, Okla. 80 179 271 422 562 719 1,194

58 07160500 Skeleton Creek near Lovell, Okla. 5,495 12,177 18,079 27,540 36,179 45,939 73,555

59 07160550 West Beaver Creek near Orlando, 

Okla.

885 1,955 2,917 4,471 5,895 7,499 12,152

60 07163000 Council Creek near Stillwater, Okla. 1,648 3,478 5,065 7,573 9,835 12,353 19,501

61 07163020 Corral Creek near Yale, Okla. 489 1,045 1,538 2,327 3,045 3,846 6,173

62 07165550 Snake Creek near Bixby, Okla. 2,642 5,251 7,412 10,740 13,678 16,903 25,825

72 07170700 Big Hill Creek near Cherryvale, Kans. 2,578 4,955 6,880 9,806 12,360 15,140 22,756

73 07170800 Mud Creek near Mound Valley, Kans. 866 1,675 2,342 3,366 4,266 5,244 7,982

74 07171700 Spring Branch near Cedar Vale, Kans. 473 1,018 1,503 2,281 2,990 3,782 6,088

75 07171800 Cedar Creek Trib. near Hooser, Kans. 191 417 625 962 1,273 1,622 2,660

76 07172000 Caney River near Elgin, Kans. 8,847 17,924 25,448 37,080 47,425 58,839 90,147

77 07173000 Caney River near Hulah, Okla. 10,022 20,908 30,093 44,441 57,304 71,609 111,082

78 07174200 Little Caney River below Cotton Creek 

near Copan, Okla.

8,549 17,533 25,030 36,660 47,016 58,487 89,993

79 07174570 Dry Hollow near Pawhuska, Okla. 431 904 1,320 1,983 2,585 3,252 5,190

80 07174600 Sand Creek at Okesa, Okla. 4,532 9,257 13,225 19,396 24,902 30,985 47,867

81 07174720 Hogshooter Creek Trib. near Bartlesville, Okla.

258 536 781 1,169 1,520 1,908 3,037

82 07176500 Bird Creek at Avant, Okla. 8,237 16,487 23,267 33,695 42,922 53,074 80,806

83 07176800 Candy Creek near Wolco, Okla. 2,070 4,197 5,989 8,778 11,263 14,000 21,664

84 07177000 Hominy Creek near Skiatook, Okla. 7,230 14,519 20,520 29,752 37,907 46,896 71,447

85 07177500 Bird Creek near Sperry, Okla. 13,948 27,572 38,604 55,442 70,263 86,535 130,438

86 07178640 Bull Creek near Inola, Okla. 1,220 2,388 3,354 4,836 6,138 7,560 11,520

89 07184000 Lightning Creek near McCune, Kans. 5,796 11,181 15,499 22,032 27,716 33,923 50,672

90 07184500 Labette Creek near Oswego, Kans. 6,393 12,256 16,934 23,997 30,135 36,827 54,843

91 07184600 Fly Creek near Faulkner, Kans. 2,078 4,007 5,573 7,957 10,037 12,304 18,529

92 07185500 Stahl Creek near Miller, Mo. 834 1,604 2,239 3,211 4,064 4,990 7,581

94 07185700 Spring River at LaRussell, Mo. 9,265 17,605 24,216 34,179 42,858 52,282 77,595

96 07186000 Spring River near Waco, Mo. 17,119 32,645 44,854 63,186 79,093 96,427 142,392

97 07186400 Center Creek near Carterville, Mo. 7,894 15,123 20,900 29,648 37,298 45,615 68,094

98 07187000 Shoal Creek above Joplin, Mo. 11,193 21,321 29,348 41,452 52,006 63,475 94,234

99 07188000 Spring River near Quapaw, Okla. 28,867 54,024 73,435 102,321 127,251 154,308 225,121
48 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Estimated rural, unregulated peak-flow statistic (PKx), in cubic 

feet per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

100 07188140 Flint Branch near Peoria, Okla. 1,065 2,074 2,913 4,208 5,356 6,604 10,118

101 07188500 Lost Creek at Seneca, Mo. 3,383 6,565 9,167 13,153 16,675 20,504 31,087

102 07188900 Butler Creek Trib. near Gravette, Ark. 464 895 1,255 1,810 2,302 2,834 4,349

103 07189000 Elk River near Tiff City, Mo. 17,689 34,114 47,212 67,066 84,515 103,511 154,545

104 07190600 Big Cabin Creek near Pyramid Corners, Okla. 3,745 7,219 10,027 14,294 18,024 22,087 33,177

105 07191000 Big Cabin Creek near Big Cabin, Okla. 11,312 21,592 29,747 42,049 52,779 64,445 95,737

106 07191220 Spavinaw Creek near Sycamore, Okla. 7,087 13,523 18,686 26,525 33,420 40,888 61,230

107 07191260 Brushy Creek near Jay, Okla. 2,039 3,918 5,454 7,802 9,870 12,112 18,333

108 07192000 Pryor Creek near Pryor, Okla. 6,820 13,272 18,482 26,407 33,349 40,935 61,507

109 07194515 Mill Creek near Park Hill, Okla. 813 1,584 2,228 3,225 4,113 5,076 7,808

110 07195000 Osage Creek near Elm Springs, Ark. 7,032 13,288 18,270 25,802 32,398 39,528 58,872

111 07195200 Brush Creek Trib. near Tontitown, Ark. 255 492 692 999 1,272 1,566 2,410

112 07195450 Ballard Creek at Summers, Ark. 2,250 4,235 5,836 8,266 10,399 12,696 19,042

113 07195500 Illinois River near Watts, Okla. 17,035 31,801 43,325 60,588 75,617 91,843 135,049

114 07195800 Flint Creek at Springtown, Ark. 1,933 3,640 5,015 7,098 8,918 10,881 16,289

115 07196000 Flint Creek near Kansas, Okla. 6,516 12,323 16,956 23,967 30,114 36,757 54,818

116 07196380 Steely Hollow near Tahlequah, Okla. 1,051 2,028 2,838 4,086 5,196 6,395 9,783

117 07196500 Illinois River near Tahlequah, Okla. 19,911 37,136 50,514 70,498 87,837 106,579 156,189

118 07196900 Baron Fork at Dutch Mills, Ark. 4,647 8,711 11,956 16,872 21,189 25,834 38,552

119 07197000 Baron Fork at Eldon, Okla. 11,443 21,594 29,625 41,736 52,338 63,799 94,664

120 07228290 Rough Creek near Thomas, Okla. 622 1,486 2,307 3,684 4,984 6,478 10,955

121 07228450 Deer Creek Trib. near Hydro, Okla. 286 671 1,037 1,647 2,220 2,876 4,850

122 07228930 Worley Creek near Tuttle, Okla. 865 1,869 2,758 4,182 5,476 6,926 11,103

123 07228960 Canadian River Trib. near Newcastle, Okla. 478 1,045 1,554 2,378 3,132 3,979 6,457

124 07229220 Walnut Creek near Blanchard, Okla. 279 613 915 1,406 1,857 2,363 3,858

125 07229300 Walnut Creek near Purcell, Okla. 5,363 11,001 15,735 23,100 29,671 36,943 57,080

126 07229420 Julian Creek Trib. near Asher, Okla. 450 931 1,347 2,005 2,596 3,250 5,128

127 07229430 Arbeca Creek near Allen, Okla. 478 961 1,371 2,012 2,580 3,205 4,982

128 07230000 Little River below Lake Thunderbird near Norman, Okla.

5,660 11,661 16,705 24,553 31,548 39,305 60,746

129 07230500 Little River near Tecumseh, Okla. 8,482 17,077 24,156 35,050 44,684 55,310 84,298
Appendix 49

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

StreamStats

Estimated rural, unregulated peak-flow statistic (PKx), in cubic 

feet per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

100 07188140 Flint Branch near Peoria, Okla. 968 1,875 2,624 3,775 4,789 5,891 8,980

101 07188500 Lost Creek at Seneca, Mo. 3,311 6,395 8,908 12,748 16,133 19,811 29,953

102 07188900 Butler Creek Trib. near Gravette, Ark. 497 956 1,339 1,929 2,453 3,018 4,627

103 07189000 Elk River near Tiff City, Mo. 17,893 34,022 46,747 65,918 82,672 100,857 149,428

104 07190600 Big Cabin Creek near Pyramid Corners, Okla. 3,829 7,411 10,316 14,741 18,620 22,847 34,412

105 07191000 Big Cabin Creek near Big Cabin, Okla. 10,838 20,665 28,449 40,176 50,382 61,485 91,212

106 07191220 Spavinaw Creek near Sycamore, Okla. 6,976 13,113 17,978 25,314 31,720 38,638 57,353

107 07191260 Brushy Creek near Jay, Okla. 2,033 3,896 5,414 7,731 9,767 11,975 18,087

108 07192000 Pryor Creek near Pryor, Okla. 6,568 12,628 17,472 24,794 31,162 38,110 56,827

109 07194515 Mill Creek near Park Hill, Okla. 703 1,370 1,928 2,793 3,563 4,398 6,769

110 07195000 Osage Creek near Elm Springs, Ark. 6,942 13,110 18,018 25,436 31,928 38,945 57,970

111 07195200 Brush Creek Trib. near Tontitown, Ark. 264 512 720 1,043 1,328 1,638 2,526

112 07195450 Ballard Creek at Summers, Ark. 2,204 4,166 5,753 8,168 10,291 12,579 18,912

113 07195500 Illinois River near Watts, Okla. 16,325 30,349 41,250 57,536 71,667 86,920 127,415

114 07195800 Flint Creek at Springtown, Ark. 2,167 4,103 5,670 8,054 10,149 12,409 18,661

115 07196000 Flint Creek near Kansas, Okla. 6,677 12,499 17,105 24,043 30,096 36,625 54,285

116 07196380 Steely Hollow near Tahlequah, Okla. 1,020 1,965 2,747 3,951 5,018 6,172 9,424

117 07196500 Illinois River near Tahlequah, Okla. 19,138 35,681 48,518 67,680 84,279 102,231 149,697

118 07196900 Baron Fork at Dutch Mills, Ark. 4,427 8,246 11,285 15,877 19,901 24,224 36,044

119 07197000 Baron Fork at Eldon, Okla. 11,085 20,836 28,519 40,076 50,158 61,056 90,315

120 07228290 Rough Creek near Thomas, Okla. 615 1,466 2,274 3,626 4,901 6,365 10,749

121 07228450 Deer Creek Trib. near Hydro, Okla. 292 686 1,059 1,681 2,265 2,933 4,942

122 07228930 Worley Creek near Tuttle, Okla. 860 1,851 2,726 4,123 5,390 6,808 10,887

123 07228960 Canadian River Trib. near Newcastle, Okla. 471 1,025 1,522 2,323 3,055 3,876 6,275

124 07229220 Walnut Creek near Blanchard, Okla. 282 617 920 1,411 1,861 2,366 3,854

125 07229300 Walnut Creek near Purcell, Okla. 5,334 10,871 15,498 22,673 29,054 36,108 55,579

126 07229420 Julian Creek Trib. near Asher, Okla. 437 899 1,299 1,927 2,490 3,112 4,896

127 07229430 Arbeca Creek near Allen, Okla. 468 943 1,348 1,981 2,544 3,162 4,927

128 07230000 Little River below Lake Thunderbird near 

Norman, Okla.

5,773 11,908 17,071 25,111 32,287 40,245 62,263

129 07230500 Little River near Tecumseh, Okla. 8,871 17,940 25,440 37,014 47,285 58,618 89,630
50 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Estimated rural, unregulated peak-flow statistic (PKx), in cubic 

feet per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

130 07231000 Little River near Sasakwa, Okla. 12,670 25,280 35,560 51,301 65,181 80,462 121,811

131 07231320 Leader Creek Trib. near Atwood, Okla. 283 575 828 1,225 1,581 1,972 3,103

132 07231560 Middle Creek near Carson, Okla. 1,011 2,006 2,839 4,128 5,268 6,517 10,027

133 07231950 Pine Creek near Higgins, Okla. 2,055 3,824 5,244 7,398 9,286 11,311 16,914

134 07232000 Gaines Creek near Krebs, Okla. 13,707 25,879 35,441 49,796 62,273 75,806 111,880

135 07232500 Beaver River near Guymon, Okla. 3,659 10,740 18,341 32,169 46,147 63,137 116,495

136 07232650 Aqua Frio Creek near Felt, Okla. 348 1,066 1,873 3,380 4,926 6,829 13,023

137 07233000 Coldwater Creek near Hardesty, Okla. 3,035 8,645 14,550 25,143 35,720 48,477 88,117

138 07233500 Palo Duro Creek near Spearman, Tex. 2,178 6,144 10,294 17,709 25,075 33,938 61,427

139 07234050 North Fork Clear Creek near Balko, Okla. 176 484 806 1,381 1,947 2,624 4,760

140 07234100 Clear Creek near Elmwood, Okla. 1,676 4,491 7,351 12,356 17,253 23,062 40,863

141 07234150 White Woman Creek Trib. near Darrouzett, Tex. 172 441 710 1,172 1,614 2,133 3,724

142 07234290 Clear Creek Trib. near Catesby, Okla. 338 893 1,458 2,448 3,414 4,554 8,095

143 07235000 Wolf Creek at Lipscomb, Tex. 2,962 7,904 12,882 21,555 30,015 40,042 70,500

144 07235700 Little Wolf Creek Trib. near Gage, Okla. 469 1,248 2,043 3,435 4,795 6,404 11,388

145 07236000 Wolf Creek near Fargo, Okla. 6,522 16,810 26,878 44,117 60,740 80,261 138,427

146 07237750 Cottonwood Creek near Vici, Okla. 550 1,369 2,170 3,536 4,843 6,362 10,976

147 07237800 Bent Creek near Seiling, Okla. 2,229 5,477 8,586 13,825 18,804 24,573 41,723

148 07239050 North Canadian River Trib. near Eagle City, 

Okla.

117 281 441 712 969 1,265 2,175

149 07241880 Sand Creek near Cromwell, Okla. 1,094 2,245 3,230 4,777 6,165 7,696 12,049

150 07242160 Alabama Creek near Weleetka, Okla. 1,625 3,273 4,663 6,828 8,758 10,879 16,847

151 07243000 Dry Creek near Kendrick, Okla. 2,704 5,689 8,259 12,312 15,963 20,026 31,480

152 07243500 Deep Fork near Beggs, Okla. 21,439 42,053 58,555 83,592 105,532 129,601 193,855

153 07243550 Adams Creek near Beggs, Okla. 889 1,793 2,561 3,760 4,829 6,004 9,336

154 07244000 Deep Fork near Dewar, Okla. 23,081 44,658 61,725 87,445 109,836 134,344 199,259

155 07244790 Brooken Creek near Enterprise, Okla. 1,106 2,137 2,989 4,297 5,451 6,704 10,213

156 07245500 Sallisaw Creek near Sallisaw, Okla. 8,228 15,645 21,563 30,525 38,386 46,898 69,975

157 07246610 Pecan Creek near Spiro, Okla. 373 714 996 1,429 1,809 2,220 3,382

158 07246630 Big Black Fox Creek near Long, Okla. 1,271 2,424 3,369 4,817 6,094 7,473 11,335

159 07247000 Poteau River at Cauthron, Ark. 11,355 19,969 26,454 35,978 44,125 52,787 75,594
Appendix 51

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

StreamStats

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet 

per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

130 07231000 Little River near Sasakwa, Okla. 12,948 25,676 35,999 51,762 65,625 80,866 121,987

131 07231320 Leader Creek Trib. near Atwood, Okla. 291 589 846 1,248 1,609 2,005 3,147

132 07231560 Middle Creek near Carson, Okla. 1,036 2,064 2,929 4,270 5,461 6,766 10,442

133 07231950 Pine Creek near Higgins, Okla. 2,063 3,832 5,248 7,390 9,264 11,274 16,820

134 07232000 Gaines Creek near Krebs, Okla. 12,844 24,008 32,699 45,669 56,862 68,994 101,123

135 07232500 Beaver River near Guymon, Okla. 4,350 12,801 21,875 38,391 55,099 75,421 139,187

136 07232650 Aqua Frio Creek near Felt, Okla. 337 1,032 1,808 3,255 4,736 6,557 12,470

137 07233000 Coldwater Creek near Hardesty, Okla. 3,661 10,335 17,304 29,742 42,113 56,999 102,991

138 07233500 Palo Duro Creek near Spearman, Tex. 2,589 7,312 12,252 21,072 29,831 40,376 73,014

139 07234050 North Fork Clear Creek near Balko, Okla. 177 483 802 1,371 1,930 2,597 4,699

140 07234100 Clear Creek near Elmwood, Okla. 1,534 4,106 6,713 11,270 15,716 20,991 37,125

141 07234150 White Woman Creek Trib. near Darrouzett, Tex. 196 508 823 1,370 1,896 2,516 4,428

142 07234290 Clear Creek Trib. near Catesby, Okla. 337 890 1,454 2,440 3,401 4,537 8,063

143 07235000 Wolf Creek at Lipscomb, Tex. 3,042 8,099 13,178 22,006 30,593 40,771 71,584

144 07235700 Little Wolf Creek Trib. near Gage, Okla. 434 1,157 1,897 3,193 4,457 5,956 10,596

145 07236000 Wolf Creek near Fargo, Okla. 6,439 16,525 26,356 43,137 59,261 78,185 134,367

146 07237750 Cottonwood Creek near Vici, Okla. 538 1,347 2,141 3,499 4,801 6,317 10,932

147 07237800 Bent Creek near Seiling, Okla. 1,926 4,716 7,375 11,842 16,066 20,961 35,455

148 07239050 North Canadian River Trib. near Eagle City, 

Okla.

114 275 432 698 951 1,242 2,134

149 07241880 Sand Creek near Cromwell, Okla. 1,068 2,180 3,127 4,611 5,938 7,400 11,545

150 07242160 Alabama Creek near Weleetka, Okla. 1,543 3,085 4,378 6,381 8,158 10,109 15,575

151 07243000 Dry Creek near Kendrick, Okla. 2,768 5,829 8,466 12,629 16,383 20,561 32,351

152 07243500 Deep Fork near Beggs, Okla. 21,195 41,486 57,702 82,277 103,785 127,374 190,273

153 07243550 Adams Creek near Beggs, Okla. 882 1,787 2,559 3,766 4,846 6,034 9,409

154 07244000 Deep Fork near Dewar, Okla. 23,000 44,613 61,744 87,591 110,119 134,787 200,207

155 07244790 Brooken Creek near Enterprise, Okla. 1,115 2,151 3,004 4,313 5,465 6,716 10,213

156 07245500 Sallisaw Creek near Sallisaw, Okla. 8,324 15,669 21,486 30,256 37,917 46,197 68,548

157 07246610 Pecan Creek near Spiro, Okla. 386 737 1,028 1,475 1,867 2,291 3,489

158 07246630 Big Black Fox Creek near Long, Okla. 1,221 2,336 3,252 4,655 5,893 7,232 10,978

159 07247000 Poteau River at Cauthron, Ark. 9,100 16,735 22,668 31,519 39,176 47,412 69,403
52 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Estimated rural, unregulated peak-flow statistic (PKx), in cubic 

feet per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

160 07247500 Fourche Maline near Red Oak, Okla. 6,137 11,025 14,759 20,265 24,957 29,990 43,303

161 07249000 Poteau River at Poteau, Okla. 22,530 41,543 56,143 77,817 96,507 116,681 169,643

162 07249300 James Fork near Midland, Ark. 4,463 8,450 11,659 16,541 20,846 25,488 38,253

163 07249400 James Fork near Hackett, Ark. 7,172 13,606 18,737 26,499 33,297 40,656 60,610

164 07249500 Cove Creek near Lee Creek, Ark. 4,146 7,654 10,430 14,611 18,263 22,177 32,856

165 07249650 Mountain Fork near Evansville, Ark. 1,842 3,441 4,730 6,690 8,411 10,259 15,388

166 07250000 Lee Creek near Van Buren, Ark. 14,796 27,947 38,348 54,052 67,842 82,739 122,848

169 07299670 Groesbeck Creek at S.H. 6 near Quannah, Tex. 2,923 7,242 11,378 18,347 24,959 32,648 55,384

170 07299705 Bitter Creek near Hollis, Okla. 446 1,157 1,873 3,115 4,322 5,739 10,111

171 07300000 Salt Fork Red River near Wellington, Tex. 5,551 14,635 23,694 39,403 54,724 72,810 127,423

172 07300150 Bear Creek near Vinson, Okla. 338 881 1,429 2,384 3,312 4,404 7,783

173 07300500 Salt Fork Red River at Mangum, Okla. 9,016 22,029 34,311 54,883 74,432 97,045 163,255

174 07301110 Salt Fork Red River near Elmer, Okla. 9,979 24,454 38,131 61,059 82,865 108,110 182,003

175 07301455 Turkey Creek near Erick, Okla. 625 1,564 2,480 4,041 5,531 7,266 12,509

176 07301480 Short Creek near Sayre, Okla. 410 1,041 1,666 2,742 3,775 4,984 8,680

177 07301500 North Fork Red River near Carter, Okla. 11,230 27,313 42,416 67,642 91,572 119,221 199,843

178 07303400 Elm Fork of North Fork Red River near Carl, 

Okla.

3,749 9,619 15,386 25,282 34,847 46,054 79,737

179 07303450 Deer Creek near Plainview, Okla. 826 2,101 3,361 5,528 7,617 10,059 17,499

180 07303500 Elm Fork of North Fork Red River near Mangum, 

Okla.

6,781 16,535 25,747 41,176 55,820 72,752 122,425

181 07309480 Canyon Creek near Medicine Park, Okla. 388 897 1,373 2,162 2,900 3,739 6,246

182 07311000 East Cache Creek near Walters, Okla. 8,885 19,103 27,922 41,882 54,535 68,710 108,311

183 07311200 Blue Beaver Creek near Cache, Okla. 1,183 2,741 4,188 6,577 8,811 11,358 18,871

184 07311420 Deadman Creek Trib. at Manitou, Okla. 267 639 995 1,594 2,160 2,810 4,776

185 07311500 Deep Red Creek near Randlett, Okla. 7,352 16,470 24,580 37,657 49,683 63,294 101,960

186 07312850 Nine Mile Beaver Creek near Elgin, Okla. 577 1,309 1,984 3,091 4,118 5,282 8,720

187 07312950 Little Beaver Creek near Marlow, Okla. 1,749 3,827 5,675 8,646 11,368 14,424 23,224

188 07313000 Little Beaver Creek near Duncan, Okla. 3,866 8,428 12,438 18,848 24,696 31,264 49,921

189 07313500 Beaver Creek near Waurika, Okla. 6,875 15,006 22,097 33,381 43,627 55,160 87,528

190 07313600 Cow Creek near Waurika, Okla. 3,536 7,738 11,427 17,312 22,653 28,670 45,680

192 07315680 Cottonwood Creek Trib. near Loco, Okla. 350 750 1,107 1,681 2,203 2,786 4,489
Appendix 53

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

StreamStats

Estimated rural, unregulated peak-flow statistic (PKx), in cubic 

feet per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

160 07247500 Fourche Maline near Red Oak, Okla. 7,102 13,158 17,913 25,045 31,248 37,922 55,905

161 07249000 Poteau River at Poteau, Okla. 22,477 41,017 55,130 75,978 93,866 113,142 163,481

162 07249300 James Fork near Midland, Ark. 4,281 8,222 11,428 16,335 20,684 25,389 38,399

163 07249400 James Fork near Hackett, Ark. 7,529 14,219 19,540 27,582 34,622 42,232 62,853

164 07249500 Cove Creek near Lee Creek, Ark. 4,155 7,622 10,352 14,453 18,025 21,849 32,257

165 07249650 Mountain Fork near Evansville, Ark. 2,084 3,913 5,395 7,656 9,655 11,800 17,780

166 07250000 Lee Creek near Van Buren, Ark. 13,216 25,515 35,389 50,415 63,676 78,090 117,149

169 07299670 Groesbeck Creek at S.H. 6 near Quannah, Tex. 2,952 7,332 11,531 18,612 25,332 33,154 56,286

170 07299705 Bitter Creek near Hollis, Okla. 442 1,144 1,848 3,070 4,254 5,645 9,927

171 07300000 Salt Fork Red River near Wellington, Tex. 5,305 14,001 22,676 37,723 52,392 69,715 122,027

172 07300150 Bear Creek near Vinson, Okla. 331 863 1,399 2,334 3,241 4,308 7,611

173 07300500 Salt Fork Red River at Mangum, Okla. 8,471 20,733 32,315 51,719 70,145 91,476 153,924

174 07301110 Salt Fork Red River near Elmer, Okla. 10,116 24,714 38,460 61,447 83,244 108,472 182,076

175 07301455 Turkey Creek near Erick, Okla. 666 1,663 2,635 4,290 5,868 7,705 13,252

176 07301480 Short Creek near Sayre, Okla. 418 1,060 1,696 2,789 3,840 5,067 8,821

177 07301500 North Fork Red River near Carter, Okla. 11,293 27,324 42,308 67,252 90,832 118,054 197,129

178 07303400 Elm Fork of North Fork Red River near Carl, 

Okla.

3,690 9,472 15,148 24,883 34,281 45,297 78,363

179 07303450 Deer Creek near Plainview, Okla. 773 1,959 3,126 5,126 7,049 9,294 16,113

180 07303500 Elm Fork of North Fork Red River near Mangum, Okla.6,397 15,622 24,337 38,928 52,759 68,765 115,678

181 07309480 Canyon Creek near Medicine Park, Okla. 394 907 1,386 2,177 2,917 3,757 6,263

182 07311000 East Cache Creek near Walters, Okla. 8,779 18,730 27,262 40,710 52,842 66,417 104,167

183 07311200 Blue Beaver Creek near Cache, Okla. 1,164 2,706 4,140 6,510 8,728 11,258 18,729

184 07311420 Deadman Creek Trib. at Manitou, Okla. 254 603 936 1,493 2,016 2,617 4,425

185 07311500 Deep Red Creek near Randlett, Okla. 6,893 15,342 22,815 34,815 45,797 58,216 93,342

186 07312850 Nine Mile Beaver Creek near Elgin, Okla. 579 1,312 1,986 3,090 4,114 5,274 8,696

187 07312950 Little Beaver Creek near Marlow, Okla. 1,747 3,804 5,626 8,551 11,223 14,221 22,836

188 07313000 Little Beaver Creek near Duncan, Okla. 3,720 8,056 11,846 17,881 23,363 29,514 46,917

189 07313500 Beaver Creek near Waurika, Okla. 6,543 14,312 21,094 31,889 41,683 52,720 83,684

190 07313600 Cow Creek near Waurika, Okla. 3,498 7,759 11,540 17,613 23,159 29,425 47,250

192 07315680 Cottonwood Creek Trib. near Loco, Okla. 361 777 1,149 1,747 2,294 2,904 4,690
54 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The peakflow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The peakflows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet 

per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

193 07315700 Mud Creek near Courtney, Okla. 8,437 17,903 26,002 38,754 50,259 63,105 98,851

194 07315880 Demijohn Creek near Wilson, Okla. 728 1,553 2,280 3,443 4,500 5,679 9,088

195 07316130 Wilson Creek near McMilllian, Okla. 575 1,185 1,713 2,546 3,296 4,124 6,503

196 07316140 Brier Creek near Powell, Okla. 1,206 2,402 3,403 4,951 6,318 7,819 12,019

197 07316500 Washita River near Cheyenne, Okla. 5,321 13,419 21,246 34,539 47,273 62,137 106,242

198 07317500 Sandstone Creek SWS 16A near Cheyenne, Okla. 336 849 1,358 2,236 3,082 4,068 7,101

199 07318500 Sandstone Creek SWS 14 near Cheyenne, Okla. 146 373 601 997 1,381 1,830 3,232

200 07319000 Sandstone Creek SWS 17 near Cheyenne, Okla. 502 1,269 2,027 3,332 4,590 6,058 10,551

201 07320000 Sandstone Creek SWS 10A near Elk City, Okla. 246 616 981 1,606 2,206 2,904 5,047

202 07321500 Sandstone Creek SWS 3 near Elk City, Okla. 104 260 417 687 947 1,250 2,191

203 07322000 Sandstone Creek SWS 9 near Elk City, Okla. 283 710 1,132 1,858 2,556 3,369 5,869

204 07324000 Sandstone Creek SWS 1 near Cheyenne, Okla. 360 903 1,439 2,358 3,242 4,271 7,424

205 07325000 Washita River near Clinton, Okla. 13,504 30,653 45,960 70,719 93,585 119,562 193,126

206 07325850 Lake Creek near Eakly, Okla. 1,723 3,968 6,033 9,422 12,577 16,169 26,670

207 07326000 Cobb Creek near Fort Cobb, Okla. 4,444 10,112 15,223 23,525 31,186 39,896 64,863

208 07327150 Salt Creek near Chickasha, Okla. 1,196 2,641 3,937 6,026 7,939 10,094 16,321

209 07327420 West Bitter Creek near Tabler, Okla. 2,024 4,466 6,641 10,141 13,341 16,948 27,294

210 07327440 East Bitter Creek near Tabler, Okla. 1,585 3,488 5,185 7,918 10,419 13,234 21,340

211 07327490 Little Washita River near Ninnekah, Okla. 3,966 8,678 12,818 19,430 25,445 32,217 51,383

212 07329000 Rush Creek at Purdy, Okla. 4,310 9,002 13,003 19,283 24,929 31,202 48,748

213 07329500 Rush Creek near Maysville, Okla. 5,343 11,081 15,939 23,537 30,348 37,903 58,922

214 07329810 Honey Creek near Davis, Okla. 1,708 3,569 5,180 7,733 10,048 12,611 19,933

215 07329900 Rock Creek near Dougherty, Okla. 5,085 10,519 15,134 22,370 28,891 36,103 56,299

216 07330500 Caddo Creek near Ardmore, Okla. 6,669 13,805 19,827 29,229 37,654 46,995 72,900

217 07332070 Rock Creek near Achille, Okla. 266 529 751 1,097 1,403 1,738 2,695

218 07332400 Blue River at Milburn, Okla. 7,239 14,253 19,984 28,773 36,551 45,055 68,343

219 07332500 Blue Creek near Blue, Okla. 11,573 22,237 30,738 43,600 54,848 67,096 100,027

220 07333500 Chickasaw Creek near Stringtown, Okla. 2,742 5,376 7,548 10,888 13,846 17,071 26,025

221 07333800 McGee Creek near Stringtown, Okla. 4,872 9,121 12,481 17,532 21,912 26,647 39,431

222 07334000 Muddy Boggy Creek near Farris, Okla. 18,644 35,270 48,291 67,815 84,774 103,193 152,039
Appendix 55

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

StreamStats

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet 

per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

193 07315700 Mud Creek near Courtney, Okla. 7,700 16,268 23,562 35,004 45,269 56,735 88,492

194 07315880 Demijohn Creek near Wilson, Okla. 733 1,558 2,283 3,438 4,485 5,651 9,012

195 07316130 Wilson Creek near McMilllian, Okla. 555 1,147 1,660 2,470 3,199 4,005 6,323

196 07316140 Brier Creek near Powell, Okla. 1,341 2,692 3,830 5,600 7,176 8,906 13,777

197 07316500 Washita River near Cheyenne, Okla. 5,011 12,613 19,949 32,390 44,283 58,164 99,288

198 07317500 Sandstone Creek SWS 16A near Cheyenne, Okla. 471 1,190 1,903 3,126 4,305 5,680 9,889

199 07318500 Sandstone Creek SWS 14 near Cheyenne, Okla. 139 354 570 944 1,307 1,730 3,050

200 07319000 Sandstone Creek SWS 17 near Cheyenne, Okla. 530 1,338 2,137 3,509 4,832 6,373 11,091

201 07320000 Sandstone Creek SWS 10A near Elk City, Okla. 249 627 1,001 1,646 2,267 2,991 5,221

202 07321500 Sandstone Creek SWS 3 near Elk City, Okla. 109 275 440 725 1,000 1,320 2,317

203 07322000 Sandstone Creek SWS 9 near Elk City, Okla. 274 684 1,090 1,784 2,451 3,226 5,606

204 07324000 Sandstone Creek SWS 1 near Cheyenne, Okla. 356 884 1,403 2,289 3,136 4,121 7,126

205 07325000 Washita River near Clinton, Okla. 13,699 30,962 46,324 71,128 94,008 119,969 193,384

206 07325850 Lake Creek near Eakly, Okla. 1,666 3,812 5,776 8,988 11,966 15,352 25,215

207 07326000 Cobb Creek near Fort Cobb, Okla. 4,322 9,833 14,803 22,871 30,312 38,772 63,013

208 07327150 Salt Creek near Chickasha, Okla. 1,155 2,549 3,795 5,803 7,637 9,704 15,667

209 07327420 West Bitter Creek near Tabler, Okla. 1,967 4,335 6,441 9,827 12,919 16,404 26,390

210 07327440 East Bitter Creek near Tabler, Okla. 1,505 3,295 4,883 7,432 9,755 12,368 19,865

211 07327490 Little Washita River near Ninnekah, Okla. 4,162 9,110 13,462 20,420 26,761 33,897 54,124

212 07329000 Rush Creek at Purdy, Okla. 4,001 8,430 12,230 18,217 23,611 29,619 46,475

213 07329500 Rush Creek near Maysville, Okla. 5,153 10,729 15,464 22,879 29,532 36,921 57,506

214 07329810 Honey Creek near Davis, Okla. 1,717 3,553 5,132 7,619 9,865 12,347 19,406

215 07329900 Rock Creek near Dougherty, Okla. 4,961 10,095 14,398 21,090 27,070 33,663 51,974

216 07330500 Caddo Creek near Ardmore, Okla. 6,189 12,783 18,331 26,973 34,688 43,246 66,910

217 07332070 Rock Creek near Achille, Okla. 256 504 714 1,038 1,324 1,637 2,528

218 07332400 Blue River at Milburn, Okla. 7,037 13,794 19,292 27,702 35,121 43,229 65,368

219 07332500 Blue Creek near Blue, Okla. 11,843 22,822 31,596 44,894 56,548 69,241 103,434

220 07333500 Chickasaw Creek near Stringtown, Okla. 2,696 5,317 7,486 10,832 13,800 17,041 26,061

221 07333800 McGee Creek near Stringtown, Okla. 4,783 8,885 12,107 16,927 21,088 25,581 37,657

222 07334000 Muddy Boggy Creek near Farris, Okla. 18,018 34,085 46,662 65,506 81,853 99,617 146,679
56 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

Tortorelli (1997)

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet 

per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

223 07335000 Clear Boggy Creek near Caney, Okla. 15,032 28,914 39,965 56,686 71,332 87,281 130,074

224 07335300 Muddy Boggy Creek near Unger, Okla. 28,228 52,623 71,410 99,341 123,438 149,556 217,909

225 07335310 Rock Creek near Boswell, Okla. 336 642 894 1,281 1,618 1,983 3,011

226 07335320 Bokchito Creek near Soper, Okla. 1,605 2,975 4,059 5,680 7,069 8,572 12,643

227 07335700 Kiamichi River near Big Cedar, Okla. 6,081 10,738 14,315 19,626 24,230 29,100 42,230

228 07335760 Kiamichi River Trib. near Albion, Okla. 821 1,534 2,117 3,010 3,799 4,643 7,029

229 07336500 Kiamichi River near Belzoni, Okla. 24,253 44,492 59,952 82,842 102,531 123,768 179,315

230 07336520 Frazier Creek near Oleta, Okla. 2,933 5,503 7,571 10,712 13,475 16,445 24,644

231 07336710 Rock Creek near Sawyer, Okla. 871 1,642 2,268 3,221 4,053 4,950 7,451

232 07336750 Little Pine Creek near Kanawha, Tex. 4,529 8,307 11,249 15,632 19,398 23,453 34,315

233 07336780 Perry Creek near Idabel, Okla. 1,516 2,808 3,840 5,398 6,754 8,210 12,221

234 07336785 Bokchito Creek near Garvin, Okla. 829 1,530 2,092 2,938 3,672 4,459 6,637

235 07336800 Pecan Bayou near Clarksville, Tex. 5,139 9,417 12,737 17,674 21,909 26,471 38,646

236 07337220 Big Branch near Ringold, Okla. 832 1,539 2,109 2,976 3,733 4,545 6,811

237 07337500 Little River near Wright City, Okla. 18,624 33,952 45,701 63,138 78,204 94,378 137,062

238 07337900 Glover River near Glover, Okla. 14,666 26,374 35,319 48,577 60,037 72,272 104,699

239 07338500 Little River below Lukfata Creek near Idabel, 

Okla.

25,682 46,736 62,771 86,497 106,948 128,922 186,483

240 07338520 Yanubbee Creek near Broken Bow, Okla. 2,124 3,884 5,282 7,388 9,227 11,190 16,595

241 07338700 Twomile Creek near Hatfield, Ark. 3,408 5,981 7,958 10,888 13,415 16,085 23,307

242 07338780 Mountain Fork Trib. near Smithville, Okla. 529 937 1,260 1,742 2,158 2,597 3,820

243 07339000 Mountain Fork near Eagletown, Okla. 22,890 40,720 54,122 73,823 90,723 108,765 155,882

244 07339500 Rolling Fork near DeQueen, Ark. 11,902 21,061 28,009 38,266 47,104 56,492 81,382

245 07339800 Pepper Creek near DeQueen, Ark. 1,816 3,225 4,323 5,957 7,368 8,863 12,948

246 07340200 West Flat Creek near Foreman, Ark. 1,779 3,177 4,261 5,869 7,243 8,709 12,672

247 07340300 Cossatot River near Vandervoort, Ark. 9,412 16,293 21,466 29,066 35,595 42,481 60,753

248 07340500 Cossatot River near DeQueen, Ark. 18,017 31,653 41,893 56,949 69,899 83,637 119,760

249 07340530 Mill Slough Trib. near Locksburg, Ark. 439 788 1,065 1,481 1,839 2,221 3,282

250 07341000 Saline River near Dierks, Ark. 9,980 17,487 23,159 31,512 38,693 46,299 66,475
Appendix 57

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Site

no.

(Tortorelli,

1997)

Station

no.

Station name

StreamStats

Estimated rural, unregulated peak-flow statistic (PKx), in cubic feet 

per second, for recurrence interval in years (x)

PK2 PK5 PK10 PK25 PK50 PK100 PK500

223 07335000 Clear Boggy Creek near Caney, Okla. 13,370 25,569 35,219 49,750 62,390 76,161 112,899

224 07335300 Muddy Boggy Creek near Unger, Okla. 28,599 53,251 72,223 100,422 124,751 151,110 220,086

225 07335310 Rock Creek near Boswell, Okla. 371 714 999 1,436 1,820 2,237 3,414

226 07335320 Bokchito Creek near Soper, Okla. 2,025 3,815 5,253 7,428 9,322 11,370 16,987

227 07335700 Kiamichi River near Big Cedar, Okla. 6,547 11,315 14,922 20,237 24,818 29,636 42,538

228 07335760 Kiamichi River Trib. near Albion, Okla. 938 1,744 2,401 3,405 4,295 5,244 7,927

229 07336500 Kiamichi River near Belzoni, Okla. 24,995 45,707 61,498 84,858 104,950 126,597 183,186

230 07336520 Frazier Creek near Oleta, Okla. 2,531 4,683 6,393 8,968 11,207 13,613 20,193

231 07336710 Rock Creek near Sawyer, Okla. 887 1,657 2,280 3,224 4,046 4,931 7,389

232 07336750 Little Pine Creek near Kanawha, Tex. 4,614 8,384 11,298 15,622 19,323 23,301 33,915

233 07336780 Perry Creek near Idabel, Okla. 1,478 2,711 3,689 5,158 6,429 7,793 11,531

234 07336785 Bokchito Creek near Garvin, Okla. 815 1,494 2,035 2,848 3,549 4,302 6,378

235 07336800 Pecan Bayou near Clarksville, Tex. 5,017 9,200 12,448 17,277 21,418 25,881 37,789

236 07337220 Big Branch near Ringold, Okla. 837 1,534 2,092 2,937 3,672 4,458 6,646

237 07337500 Little River near Wright City, Okla. 21,030 37,829 50,594 69,469 85,757 103,168 148,984

238 07337900 Glover River near Glover, Okla. 15,008 26,838 35,838 49,147 60,629 72,871 105,246

239 07338500 Little River below Lukfata Creek near Idabel, 

Okla.

27,354 49,342 65,985 90,544 111,682 134,336 193,535

240 07338520 Yanubbee Creek near Broken Bow, Okla. 2,023 3,654 4,937 6,858 8,522 10,296 15,151

241 07338700 Twomile Creek near Hatfield, Ark. 3,288 5,792 7,720 10,581 13,047 15,658 22,721

242 07338780 Mountain Fork Trib. near Smithville, Okla. 498 877 1,175 1,620 2,001 2,405 3,523

243 07339000 Mountain Fork near Eagletown, Okla. 23,779 42,096 55,817 75,953 93,210 111,608 159,581

244 07339500 Rolling Fork near DeQueen, Ark. 11,936 21,067 27,979 38,172 46,944 56,258 80,920

245 07339800 Pepper Creek near DeQueen, Ark. 1,757 3,114 4,168 5,737 7,088 8,520 12,426

246 07340200 West Flat Creek near Foreman, Ark. 1,775 3,155 4,221 5,797 7,141 8,575 12,440

247 07340300 Cossatot River near Vandervoort, Ark. 9,730 16,671 21,848 29,427 35,919 42,747 60,806

248 07340500 Cossatot River near DeQueen, Ark. 18,183 31,890 42,171 57,278 70,265 84,037 120,227

249 07340530 Mill Slough Trib. near Locksburg, Ark. 465 828 1,116 1,547 1,918 2,311 3,404

250 07341000 Saline River near Dierks, Ark. 10,239 17,798 23,476 31,816 38,969 46,530 66,533
58 StreamStats in Oklahoma—Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams

Appendix 2. Peak-flow frequency statistics estimated by using basin characteristics from Tortorelli (1997) and StreamStats. The 

peak-flow statistics computed by using Tortorelli (1997) basin characteristics will not match those reported in Tortorelli (1997). The 

peak-flows reported in Tortorelli (1997) were computed from gaged data.—Continued

[Ark., Arkansas; Kans., Kansas; Mo., Missouri; N. Mex., New Mexico; Okla., Oklahoma; Tex., Texas; Trib., Tributary; S.H., State Highway; SWS, Subwatershed]

Summary of comparison of statistics 

computed by Tortorelli (1997) and 

StreamStats

PK2 PK5 PK10 PK25 PK50 PK100 PK500

Number of statistics that are greater:

 using Tortorelli (1997) 

basin characteristics 124 131 133 136 138 139 140

 using StreamStats 

basin characteristics 84 77 75 72 70 69 68

Average relative percent difference:

 of statistics that are 

greater in Tortorelli 

(1997)

5.32 5.23 5.30 5.35 5.41 5.48 5.67

 of statistics that are 

greater in StreamStats 5.02 5.32 5.42 5.64 5.82 5.92 6.05
Appendix 59