A Streamflow Statistics (StreamStats) Web 

Application for Ohio

By G. F. Koltun, Stephanie P. Kula, and Barry M. Puskas

U.S. Department of the Interior

U.S. Geological Survey

In cooperation with the Ohio Department of Transportation; U.S. Department of Transportation, Federal 

Highway Administration; Federal Emergency Management Agency; Ohio Environmental Protection Agency; 

and Ohio Department of Natural Resources

Scientific Investigations Report 2006-5312
U.S. Department of the Interior

DIRK KEMPTHORNE, Secretary

U.S. Geological Survey

Mark D. Myers, Director

U.S. Geological Survey, Reston, Virginia: 2006

For sale by U.S. Geological Survey, Information Services

Box 25286, Denver Federal Center

Denver, CO 80225

The contents of this report do not necessarily reflect the official views or policies of the Ohio Department of Transportation or the Federal Highway Administration. This report does not constitute a standard, specification or regulation.

For more information about the USGS and its products:

Telephone: 1-888-ASK-USGS

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Any use of trade, product, or firm names in this publication 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:

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.
3. Recipient’s Catalog No.

5. Report Date

October 2006

6. Performing Organization Code

8. Performing Organization Report No.

SIR 06-5312

10. Work Unit No. (TRAIS)

11. Contract or Grant No.

State Job No. 134265

13. Type of Report and Period Covered

Final Report

14. Sponsoring Agency Code

1. Report No. 2.Government Accession No.

FHWA/OH-2006/25

4. Title and Subtitle

A Streamflow Statistics (StreamStats) Web Application for Ohio

7. Author(s)

G.F. Koltun, Stephanie P. Kula, and Barry M. Puskas

9. Performing Organization Name and Address

U.S. Dept. of Interior, U.S. Geological Survey

Water Resources Division

6480 Doubletree Avenue

Columbus, OH 43229-1111

12. Sponsoring Agency Name and Address

Ohio Department of Transportation

1980 West Broad Street

Columbus, OH 43223

15. Supplementary Notes

Prepared in cooperation with the Federal Emergency Management Agency, Ohio Environmental Protection 

Agency, and Ohio Department of Natural Resources

16. Abstract

A StreamStats Web application was developed for Ohio that implements equations for estimating a variety of 

streamflow statistics including the 2-, 5-, 10-, 25-, 50-, 100-, and 500-year peak streamflows, mean annual 

streamflow, mean monthly streamflows, harmonic mean streamflow, and 25th-, 50th-, and 75th-percentile streamflows. StreamStats is a Web-based geographic information system application designed to facilitate the estimation 

of streamflow statistics at ungaged locations on streams. StreamStats can also serve precomputed streamflow 

statistics determined from streamflow-gaging station data. The basic structure, use, and limitations of StreamStats are described in this report.

To facilitate the level of automation required for the StreamStats application, the technique used by Koltun 

(2003) for computing main-channel slope was replaced with a new computationally robust technique. The new 

channel slope characteristic, referred to as SL10-85, differed from the National Hydrography Data based channel 

slope values (SL) reported by Koltun (2003) by an average of -28.3 percent, with the median change being -13.2 

percent. In spite of the differences, the two slope measures are strongly correlated.

The change in channel slope values necessitated revision of the full-model equations for flood-peak discharges 

presented by Koltun (2003). Average standard errors of prediction for the revised full-model equations presented 

in this report increased by a small amount over those reported by Koltun (2003), with increases ranging from 0.7 

to 0.9 percent. Mean percentage changes in the revised regression and weighted flood-frequency estimates relative to regression and weighted estimates reported by Koltun (2003) were small, ranging from -0.72 to -0.25 percent and -0.22 to 0.07 percent, respectively.

17. Key Words

Flood frequency, flood-peak estimation, flood-peak discharge, 

streamflow statistics, StreamStats

18. Distribution Statement

No Restrictions. This document is available to 

the public through the National Technical 

Information Service, Springfield, Virginia 22161

19. Security Classif. (of this report)

Unclassified

20. Security Classif. (of this page)

Unclassified

21. No. of Pages

62

22. Price

Form DOT F 1700.7 (8-72) Reproduction of completed page authorized

v

Contents

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

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

Purpose and Scope ............................................................................................................................................... 2

Methods .................................................................................................................................................................. 2

Processing of Geospatial Datasets ......................................................................................................... 2

Determination of Channel Slope ............................................................................................................... 3

Generalized Least-Squares Regression Analysis .................................................................................. 9

StreamStats............................................................................................................................................................. 12

Limitations .............................................................................................................................................................. 13

Acknowledgments ................................................................................................................................................. 14

Summary.................................................................................................................................................................. 14

References .............................................................................................................................................................. 14

Appendixes.............................................................................................................................................................. 56

1. Appendix A — Statistical techniques for determining confidence intervals and testing for 

extrapolation .................................................................................................................................. 57

2. Appendix B — Basin characteristics used as regressor variables .............................................. 62

Figures 

1. Locations of streamflow-gaging stations used in the analyses.......................................................... 10

Tables

1. Selected basin characteristics of streamflow-gaging stations.......................................................... 3

2. Statistics of selected basin characteristics, by region, for streamflow-gaging stations used 

in the regression analyses....................................................................................................................... 11

3. Full-model equations for estimating flood-peak discharges of rural, unregulated streams in 

Ohio ............................................................................................................................................................. 11

4. Simple equations for estimating flood-peak discharges of rural, unregulated streams in Ohio... 12

5. Flood-frequency data for streamflow-gaging stations......................................................................... 17

6. Statistics of percent differences between old and new flood-frequency estimates...................... 13

7. Matrix for the simple equations in table 4............................................................................. 58

8. Matrix for the full-model equations in table 3...................................................................... 59

9. Model error variances and maximum mean-square sampling errors for regression models ........ 60

XTΛ–1 { } X –1

XTΛ–1 { } X –1
vi

Conversion Factors 

Multiply By To obtain

Length

inch (in.) 25.4 millimeter

foot (ft) 0.3048 meter

mile (mi) 1.609 kilometer

Volume

ounce, fluid (fl. oz) 0.02957 liter 

gallon (gal) 3.785 liter

cubic inch (in3

) 0.01639 liter 

Area

square mile (mi2) 2.590 square kilometer

Flow rate

cubic foot per second (ft3

/s) 0.02832 cubic meter per second

million gallons per day (Mgal/d) 0.04381 cubic meter per second
Abstract 1

Abstract

A StreamStats Web application was developed for Ohio 

that implements equations for estimating a variety of streamflow statistics including the 2-, 5-, 10-, 25-, 50-, 100-, and 500-

year peak streamflows, mean annual streamflow, mean monthly 

streamflows, harmonic mean streamflow, and 25th-, 50th-, and 

75th-percentile streamflows. StreamStats is a Web-based geographic information system application designed to facilitate 

the estimation of streamflow statistics at ungaged locations on 

streams. StreamStats can also serve precomputed streamflow 

statistics determined from streamflow-gaging station data. The 

basic structure, use, and limitations of StreamStats are 

described in this report.

To facilitate the level of automation required for Ohio’s 

StreamStats application, the technique used by Koltun (2003)1

for computing main-channel slope was replaced with a new 

computationally robust technique. The new channel-slope characteristic, referred to as SL10-85, differed from the National 

Hydrography Data based channel slope values (SL) reported by 

Koltun (2003)1 by an average of -28.3 percent, with the median 

change being -13.2 percent. In spite of the differences, the two 

slope measures are strongly correlated.

The change in channel slope values resulting from the 

change in computational method necessitated revision of the 

full-model equations for flood-peak discharges originally presented by Koltun (2003)1. Average standard errors of prediction 

for the revised full-model equations presented in this report 

increased by a small amount over those reported by Koltun 

(2003)1, with increases ranging from 0.7 to 0.9 percent. Mean 

percentage changes in the revised regression and weighted 

flood-frequency estimates relative to regression and weighted 

estimates reported by Koltun (2003)1 were small, ranging from 

-0.72 to -0.25 percent and -0.22 to 0.07 percent, respectively.

Introduction

A variety of streamflow statistics have been determined 

for Ohio streamflow-gaging stations in recent years and subsequently published in U. S. Geological Survey reports (Koltun, 

2003; Koltun and Whitehead, 2002; Sherwood, 1993, and 

Straub, 2001). Many of those statistics are used by government 

agencies, engineers, scientists, and watershed groups for purposes of water management, permitting, and (or) design. 

Because streamflow statistics commonly are needed at locations where there are no stream gages, several studies have been 

performed to develop equations for estimating streamflow statistics at ungaged locations in Ohio (Koltun, 2003; Koltun and 

Whitehead, 2002; and Sherwood, 1993). Historically, the estimation equations were based on explanatory variables that were 

determined from maps or other hard-copy sources; however, 

recent equations for estimating selected streamflow statistics 

have been developed for streams in Ohio using digital geospatial datasets and Geographic Information System (GIS) technology (Koltun, 2003; Koltun and Whitehead, 2002) to derive 

explanatory variables. The use of a GIS can greatly improve the 

efficiency of estimating streamflow statistics; however, proper 

application of the equations with GIS-based explanatory variables depends on use of digital datasets and GIS techniques that 

are equivalent to those used to determine measures of explanatory variables used in the equations. Unfortunately, use of these 

digital datasets and GIS techniques requires significant data 

storage and processing, costly proprietary software programs, 

and a level of familiarity with GIS techniques that many users 

lack.

The USGS, in cooperation with Environmental Systems 

Research Institute (ESRI) Inc., has developed a national Webbased GIS application called StreamStats that can serve published streamflow statistics to the public and facilitate the estimation of streamflow statistics for ungaged sites. As described 

by Ries and others (2004), the StreamStats application consists 

of five major components: (1) a user interface that displays 

maps and allows users to select stream locations where they 

want streamflow statistics information, (2) a database that contains previously published streamflow statistics and descriptive 

information for USGS data-collection stations, (3) an automated GIS process that determines drainage boundaries for 

user-selected ungaged sites and measures the basin characteristics for those sites, (4) a GIS database that stores base-map data 

1Koltun, G.F., 2003, Techniques for Estimating Flood-Peak Discharges of Rural, Unregulated Streams in Ohio, Second Edition: U. S. 

Geological Survey Water-Resources Investigations Report 03-4164, 

76 p

A Streamflow Statistics (StreamStats) Web Application 

for Ohio

By G. F. Koltun, Stephanie P. Kula, and Barry M. Puskas
2 A Streamflow Statistics (StreamStats) Web Application for Ohio

needed for users to locate sites of interest and other geospatial 

data needed for measuring basin characteristics2, and (5) an 

automated process that takes the measured basin characteristics 

for ungaged sites as input, solves regression equations to estimate various streamflow statistics, and outputs the estimates for 

display to the user in a Web browser window.

The availability of StreamStats presented an opportunity 

to make GIS-based estimation of streamflow statistics easier, 

faster, and more consistent for the average user than previous 

manual and semiautomated techniques. Consequently, the U.S. 

Geological Survey (USGS), in cooperation with the Ohio 

Department of Transportation; U.S. Department of Transportation, Federal Highway Administration; Federal Emergency 

Management Agency; Ohio Environmental Protection Agency; 

and Ohio Department of Natural Resources have implemented 

StreamStats for Ohio. To facilitate the level of automation 

required for Ohio’s StreamStats application, a new computationally robust technique for estimating channel slope was 

implemented which, in turn, necessitated revision of the fullmodel equations for flood-peak discharges presented by Koltun 

(2003).

Purpose and Scope

The purposes of this report are to (1) present revised 

flood-frequency equations and estimates determined on the 

basis of channel slope estimates derived with a different and 

computationally more robust technique than previously presented by Koltun(2003), and (2) describe the development, 

characteristics, use, and limitations of the StreamStats application constructed for Ohio that implements the revised flood-frequency equations as well as equations previously published for 

selected other streamflow characteristics. 

Methods

StreamStats incorporates a web-based map and data 

server, a geographic information system (ArcGIS), and a hydrologic data structure and toolbox (ArcHydro) to form an integrated GIS application. A large part of the effort involved in 

implementing StreamStats surrounds developing, quality assuring, and preprocessing geospatial datasets required to determine 

basin characteristic explanatory variables used in the regression 

models. The main geospatial datasets required for Ohio’s implementation of StreamStats include a 10-meter (32.81 ft) digital 

elevation model (DEM) developed for this study, the 1992 

National Landcover Dataset (NLCD) (U.S. Geological Survey, 

2000), the medium resolution (1:100,000 scale) National 

Hydrography Dataset (NHD) U.S. Geological Survey, 2004), a 

flood-region boundary dataset for Ohio (Quigley, 2003), a mean 

annual precipitation dataset (Whitehead, 2002a), and a streamflow variability index dataset (Whitehead, 2002b). All geospatial datasets used in this study were projected to Universal 

Transverse Mercator, zone 17 coordinates.

Processing of Geospatial Datasets

StreamStats uses a DEM to derive the stream network 

and drainage area contributing to any chosen point. Consequently, the accuracy and resolution of the DEM can greatly 

influence the accuracy of the derived stream network and drainage area. The 10-meter (32.81 ft) DEM used in this study was, 

in general, developed by using the TOPOGRID command 

(Environmental Systems Research Institute, 2005) to convert 

1:24,000 scale hypsographic coverages to grid format. Hypsographic coverages were not available for a small area in Southern Michigan that drains into Ohio so the 10-meter (32.81 ft) 

DEM for that area was created by resampling the 30-meter 

(92.83 ft) National Elevation Dataset (NED) to a 10-meter 

(32.81 ft) grid spacing.

Several of the geospatial datasets were preprocessed to 

facilitate rapid determination of basin characteristics when 

using StreamStats and to help ensure accurate basin characteristic determinations. The preprocessing steps include (1) selection of primary flow paths in those areas where the NHD 

indicated split flow (such as might occur when flow splits 

around an island in a river), (2) “walling” of basin boundaries, 

(3)“burning in” streams, and (4) elimination of sinks. 

In split flow situations, primary flow paths were determined by examining the 1:24,000 scale digital raster graphic 

(DRG) and(or) orthophotograph(s) of the area where the flow 

split occurred. The channel that appeared to carry the greatest 

amount of flow was selected as the primary flow path and the 

alternate flow path(s) removed.

The process of “walling” of basin boundaries involves 

artificially increasing elevations of grid cells that are co-located 

with known basin boundaries. Walling the basin boundaries 

ensures that known drainage divides are conserved. Like the 

burning in process, the walling process is most critical to accurate basin delineation in very flat terrain where small differences between DEM elevations and actual land-surface 

elevations can result in incorrect derivation of basin divides. 

The basin boundaries used for walling corresponded to the most 

resolved hydrologic unit or basin-boundary coverages available 

(Natural Resources Conservation Service, 1999; U.S. Geological Survey, 1999; Michigan Department of Environmental 

Quality, 1998 Pennsylvania Department of Environmental Protection, 1998).

The process of “burning in” streams involves artificially 

reducing elevations of grid cells that are co-located with stream 

2In this report, the term “basin characteristic” refers to a physical 

or environmental characteristic that is associated with a specific drainage area. StreamStats computes several basin characteristics on the 

basis of information contained in geospatial datasets.
Methods 3

lines as defined in the medium resolution (1:100,000 scale) 

NHD dataset. A surface-reconditioning algorithm called 

AGREE (Hellweger, 1997) was used to burn in streams. In 

addition to reducing elevations of grid cells that are co-located 

with stream lines, the AGREE process creates a smooth transition in elevations between the stream-line grid cells and adjacent grid cells extending a fixed distance (in this case 60 m) 

away and ensures that there are no in-stream elevation depressions along the flow path. 

This stream burning process ensures that the stream network derived from the DEM follows the expected flow pathways at those locations where they are defined in the NHD. That 

becomes most critical in flat terrain where small differences 

between DEM elevations and actual land-surface elevations can 

result in derivation of incorrect flow paths. Ideally, a high resolution (1:24,000 scale) NHD dataset would be used for this purpose; however, at the time of this writing (June, 2006), a high 

resolution NHD was not available for the entire state. Because 

of scale differences between the 1:100,000 scale medium resolution NHD and the 1:24,000 scale digital raster graphics 

(DRGs) of the 7.5 minute quadrangle topographic maps, the 

DEM-based flow pathways may at times be offset somewhat 

from the blue lines (representing streams) shown on the DRGs.

Once the DEM has been modified as described above, it 

is processed to remove depressions that result in non-contributing area (sinks) within a drainage. The process of removing 

sinks commonly is referred to as “filling”. Implicit in the filling 

process is the assumption that the sinks are not real, but instead 

are artifacts in the DEM. 

The filled DEM is used to develop a flow direction grid 

which, in turn, is used to develop a flow-accumulation grid.The 

flow-direction grid contains values that identify the flow direction from each grid cell to one of its 8 adjacent grid cells. The 

flow direction is assumed to follow the path of steepest descent 

from one grid cell to the next. The flow-accumulation grid is 

created from the flow-direction grid by totaling the number of 

up-gradient grid cells that contribute to each individual grid 

cell.

A stream grid (representing the location of streams) is 

created from the flow-accumulation grid by determining where 

the flow accumulation grid values exceed a set threshold of contributing area (typically, 15 km2 (5.79 mi2)). The stream grid is 

further processed to establish linkages between stream segments and determine locations of outlets from distinct catchments. Ultimately, flow-accumulation and outlet information 

are used in combination to delineate gridded representations of 

catchments, which subsequently are vectorized and used as 

clipping boundaries along with other geospatial datasets to 

determine basin characteristics.

Determination of Channel Slope

The NHD-based main-channel slope characteristic (SL) 

used by Koltun (2003) in Ohio’s most recent peak flow estimation report was abandoned in favor of a new channel slope characteristic that is computationally more robust. The new channel 

slope characteristic (SL10-85) is computed by (a) determining 

the longest flowpath from the point of interest to a topographic 

divide, (b) determining the elevation at 10 percent of the distance along the longest flowpath upstream from the point at 

which the flow statistic is desired (E10), (c) determining the elevation at 85 percent of the distance along the longest flowpath 

upstream from the point at which the flow statistic is desired 

(E85), (d) determining the length of the stream segment between 

points 10- and 85-percent of the distance along the longest flowpath upstream from the point at which the flow statistic is 

desired (L10-85), and then (e) dividing the change in elevation 

(E85 - E10) by L10-85. 

The SL10-85 channel slope values computed for this 

study (table 1) differed from the SL values reported by Koltun 

(2003) by an average of -28.3 percent, with the median change 

being -13.2 percent. In spite of the differences (which were 

expected due to changes in method of computation), the two 

slope measures are strongly correlated (Pearson’s r = 0.97) and 

consequently should provide nearly the same information in 

regression models. The channel slope characteristic was the 

only explanatory variable that was changed from those 

described by Koltun (2003).

Table 1. Selected basin characteristics of streamflowgaging stations

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)

1 03022500 A 629 6.19 3.87

2 03023000 A 90.2 7.94 7.90

3 03086100 A 15.6 45.8 0.02

4 03086500 A 89.2 11.5 2.79

5 03087000 A 17.4 22.1 1.66

6 03088000 A 33.2 11.5 9.70

7 03089500 A 19.1 10.9 3.94

8 03090500 A 248 5.12 4.61

9 03092000 A 21.9 14.1 7.12

10 03092090 A 21.8 20.2 10.22

11 03092100 A 10.6 18.8 6.35

12 03092500 A 96.3 10.9 7.03
4 A Streamflow Statistics (StreamStats) Web Application for Ohio

13 03092600 A 0.21 76 4.89

14 03093000 A 97.6 10.5 10.50

15 03094900 A 8.45 15 9.66

16 03096000 A 138 4.9 11.48

17 03098500 A 66.3 6.74 5.39

18 03098700 A 14 44.6 6.65

19 03102900 A 1.13 28.1 1.86

20 03102950 A 96.7 5.47 12.94

21 03104760 A 2.26 51.5 3.87

22 03106000 A 356 5.17 0.13

23 03106500 A 398 5.79 3.36

24 03108000 B 178 8.11 0.35

25 03109000 A 6.19 53.9 0.40

26 03109500 A 496 7.89 1.42

27 03110000 B 147 9.36 1.12

28 03110980 B 0.04 457 0.00

29 03111150 B 10.3 35.5 0.00

30 03111450 B 1.31 70.4 0.99

31 03111455 B 10.9 35.8 4.33

32 03111470 B 1.57 75.9 1.59

33 03111490 B 0.44 103 1.05

34 03111500 B 123 15.2 2.34

35 03111540 A 0.34 239 0.00

36 03111548 A 97.7 13.4 1.15

37 03112000 A 281 9.84 0.31

38 03113700 A 4.95 127 0.03

39 03114000 A 134 13.6 0.84

40 03114240 A 0.53 206 0.39

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2

, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)

41 03114500 A 458 3.65 0.25

42 03114550 A 0.88 131 0.29

43 03114600 A 1.22 126 0.00

44 03115280 A 5.45 83.7 0.22

45 03115400 A 210 5.5 0.30

46 03115410 A 0.13 301 0.00

47 03115500 A 258 4.32 0.38

48 03115510 A 1.52 110 0.02

49 03115600 A 3.46 67.1 0.31

50 03115710 A 0.19 337 0.76

51 03115973 B 3.65 9.82 5.64

52 03116000 B 174 8.11 7.20

53 03116100 B 16.4 10.3 0.78

54 03116200 B 146 6.07 2.41

55 03117000 B 518 5.24 4.76

56 03117500 B 253 3.14 2.57

57 03118000 B 43.1 4.78 4.23

58 03118500 B 175 6.71 2.57

59 03119000 B 481 4.06 2.87

60 03119700 B 14.3 40.8 1.24

61 03122500 B 1,405 2.78 3.18

62 03123400 B 0.74 137 1.07

63 03125000 B 1.64 92.2 0.17

64 03125300 A 2.26 78 0.49

65 03125450 A 1.97 105 0.55

66 03127950 B 5.45 85.1 1.76

67 03128650 A 0.55 149 1.45

68 03129000 B 2,443 1.82 1.51

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)
Methods 5

69 03129012 A 0.01 674 0.00

70 03129014 A 0.44 250 0.08

71 03129016 A 0.12 337 0.32

72 03129300 A 0.24 55.7 0.44

73 03130500 A 5.44 34.3 2.78

74 03132000 A 136 7.37 2.26

75 03134000 A 120 10.3 1.17

76 03136000 A 948 3.03 0.52

77 03136500 A 202 8.1 1.27

78 03137000 A 455 6.35 1.10

79 03138500 A 1,505 3.04 0.30

80 03138900 A 0.9 134 0.08

81 03139000 A 464 3.62 2.54

82 03139930 A 0.54 197 0.73

83 03139940 A 1.44 137 0.30

84 03139960 A 2.38 81.8 0.23

85 03139970 A 0.19 245 0.00

86 03139980 A 4.02 67.3 0.20

87 03139990 A 7.16 40.5 0.23

88 03140000 A 27.2 21.8 0.19

89 03140010 A 0.12 305 0.85

90 03140020 A 0.06 489 0.50

91 03140030 A 0.04 386 0.00

92 03142200 A 55.6 6.41 2.00

93 03144000 A 140 10.2 0.33

94 03144500 A 5,993 1.82 0.98

95 03144800 A 1.1 27.6 0.82

96 03145500 A 82.7 13.5 0.78

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2

, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)

97 03145600 A 3.17 20.1 2.19

98 03146000 A 116 9.57 0.92

99 03146500 A 537 8.66 1.69

100 03147000 A 672 7.74 1.45

101 03147500 A 742 6.83 0.41

102 03147900 A 10.1 40 0.23

103 03148300 A 80.6 8.88 2.49

104 03149500 A 75.7 8.29 0.34

105 03150000 A 7,422 1.54 1.11

106 03150600 A 0.99 59.3 0.15

107 03154500 A 79.4 4.86 0.06

108 03155500 A 453 4.09 0.15

109 03157000 A 89 8.63 0.25

110 03157500 A 459 5.72 0.81

111 03158100 A 1.04 97.6 0.03

112 03158220 A 1.09 93.1 0.85

113 03159450 A 1.48 73.9 0.24

114 03159500 A 943 4 0.94

115 03159540 A 156 4.09 0.30

116 03159700 A 0.7 150 0.52

117 03201440 A 1.04 82 0.00

118 03201480 A 0.7 118 0.00

119 03201550 A 0.3 206 0.24

120 03201600 A 0.98 109 0.04

121 03201700 A 1.01 104 0.00

122 03202000 A 585 1.9 0.78

123 03204500 A 256 4.74 0.07

124 03205995 A 0.73 119 0.00

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)
6 A Streamflow Statistics (StreamStats) Web Application for Ohio

125 03207000 A 291 6.95 0.67

126 03216563 A 0.94 117 1.15

127 03217000 C 242 4.03 0.44

128 03217500 A 257 2.56 0.48

129 03218000 B 72.4 3.7 0.41

130 03219500 A 567 1.61 0.75

131 03219590 A 83.2 4.72 0.52

132 03220000 A 178 4.92 0.75

133 03221000 A 980 1.65 0.74

134 03223000 A 157 5.61 0.74

135 03224000 A 25.4 9.48 0.08

136 03224500 A 98.7 11.5 0.74

137 03225500 A 393 3.93 0.76

138 03226200 A 5.84 8.12 0.84

139 03226850 A 0.4 50.6 0.99

140 03228000 A 11 28.8 0.65

141 03228300 A 101 6.92 0.89

142 03228500 A 190 10.1 0.59

143 03228805 A 122 9.6 0.00

144 03229000 A 189 6.69 0.46

145 03229500 A 544 7.93 1.87

146 03230500 A 534 4.6 0.80

147 03230600 A 5.66 54.1 0.27

148 03230800 A 228 7.03 0.67

149 03231000 A 333 5.98 0.54

150 03231500 A 3,849 2.41 1.25

151 03231600 A 3.82 10 0.15

152 03232000 A 249 3.96 0.15

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2

, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)

153 03232300 A 209 4.78 0.21

154 03232500 A 140 9.41 0.41

155 03234000 A 807 5.19 0.73

156 03234100 A 9.6 49.5 0.24

157 03234500 A 5,131 2.34 1.05

158 03235000 A 11.5 27.2 0.04

159 03235080 A 3.13 55.9 0.21

160 03235200 A 0.89 118 0.04

161 03235400 A 0.3 226 0.00

162 03235500 A 1.35 143 0.00

163 03235995 A 268 11.9 0.35

164 03236090 A 1.28 77.8 0.20

165 03236100 A 3.76 37.9 0.13

166 03237095 A 1.22 117 0.12

167 03237210 A 1.04 172 0.03

168 03237280 C 12.2 68.5 0.01

169 03237300 C 0.89 54.5 0.12

170 03237500 C 387 8.78 0.41

171 03238030 C 1.9 57 0.10

172 03238400 C 0.88 22.9 0.00

173 03238500 C 218 7.41 0.35

174 03239000 A 48.9 11.1 0.20

175 03239500 A 28.9 10 1.45

176 03240000 A 129 13 0.60

177 03240500 A 28.9 6.91 0.21

178 03241000 A 17.1 6.39 0.06

179 03241500 A 63.2 12.3 0.19

180 03241600 A 4.21 24 0.05

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)
Methods 7

181 03242050 A 366 9.14 0.54

182 03242100 A 1.01 77.5 0.04

183 03242150 A 71.4 11 0.49

184 03242200 A 77.8 6.93 0.25

185 03242300 A 209 7.97 0.00

186 03242500 A 680 7.19 0.00

187 03244000 C 219 11.1 0.87

188 03245500 C 1,203 6.19 0.70

189 03246500 C 237 5.17 0.47

190 03247100 C 3.34 22.8 0.26

191 03247500 C 476 6.9 0.52

192 03248000 C 1,713 6.07 1.12

193 03254400 C 13.6 32.9 0.00

194 03255500 C 73 8.58 0.36

195 03258000 C 35.6 20.2 0.26

196 03260700 A 36.3 27.3 0.78

197 03260800 A 59.1 23.6 0.78

198 03261500 A 541 2.79 2.10

199 03262750 A 0.83 76.2 0.17

200 03263100 A 3.11 48.5 0.07

201 03263700 A 4.83 18.5 0.14

202 03264000 A 193 5.01 0.92

203 03265000 A 503 5.39 0.58

204 03265100 A 0.46 21.3 0.05

205 03266500 A 7.31 33.2 1.02

206 03267000 A 162 11.3 0.39

207 03267900 A 310 8.95 0.53

208 03268000 A 65.3 18 0.56

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2

, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)

209 03268300 A 3.33 16.6 0.36

210 03268500 A 39.2 14.7 1.36

211 03269000 A 139 14.7 0.61

212 03269500 A 490 26.1 0.58

213 03270500 A 2,511 3.24 1.01

214 03270800 C 22.7 15.6 0.22

215 03271000 C 68.7 16.2 0.33

216 03271800 C 197 9.3 0.26

217 03272695 C 0.33 129 0.11

218 03272700 C 69 15.8 0.23

219 03272800 C 120 15.5 0.57

220 03272900 C 0.94 116 0.08

221 03273500 C 307 13 0.67

222 03274000 A 3,630 3.21 0.90

223 03274100 C 0.29 84.3 0.25

224 03274880 C 0.78 52.1 0.13

225 03275500 C 121 12.1 1.05

226 03275600 C 200 11.2 1.13

227 03275800 C 0.3 103 0.00

228 03275900 C 5.39 23.3 0.19

229 03276640 C 0.25 343 0.79

230 03322500 A 262 7.54 7.75

231 03325500 A 133 7.54 1.01

232 04096515 B 48.7 13.5 6.19

233 04099060 B 1.22 18.4 1.67

234 04176000 B 463 5.28 7.78

235 04176900 B 3.52 14.6 4.37

236 04177400 B 1.84 12.1 3.91

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)
8 A Streamflow Statistics (StreamStats) Web Application for Ohio

237 04177720 B 37.5 10.9 6.86

238 04178000 B 610 3.54 4.70

239 04179500 B 87.3 7.23 2.38

240 04180000 B 270 5.91 3.57

241 04182590 B 21.9 4.03 1.05

242 04183500 B 2,129 1.72 2.65

243 04183750 B 0.34 34.9 0.85

244 04184500 B 206 6.83 5.16

245 04184750 B 2.58 18.9 0.26

246 04184760 B 0.56 29.2 1.30

247 04185000 B 410 5.28 3.70

248 04185150 B 0.4 41.3 1.90

249 04185440 B 4.23 17.1 1.30

250 04185945 B 0.51 20.1 0.00

251 04186500 B 332 3.45 0.57

252 04186800 B 0.53 45.9 0.34

253 04187100 B 128 4.32 1.58

254 04187500 B 160 3.91 1.51

255 04187945 B 1.45 12.4 1.07

256 04188500 B 55 8.5 0.70

257 04189000 B 346 3.44 1.22

258 04189100 B 4.65 9.89 0.71

259 04189500 B 644 2.7 0.98

260 04190350 B 1.04 5.79 0.25

261 04190500 B 5.14 7.89 0.54

262 04191480 B 1.66 6.61 0.54

263 04191500 B 2,318 1.91 0.80

264 04192500 B 5,545 1.36 1.95

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2

, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)

265 04192900 B 0.98 13.7 0.35

266 04193500 B 6,330 1.21 1.87

267 04195500 B 428 3.8 1.29

268 04196000 B 88.8 6.81 1.42

269 04196500 B 298 5.9 1.26

270 04196700 B 5.29 9.13 0.27

271 04196800 B 229 3 0.90

272 04197000 B 774 3.98 1.06

273 04197100 B 149 4.85 0.99

274 04197170 B 34.6 7.11 0.44

275 04197300 B 66.2 5.59 0.73

276 04197400 B 70.1 6.74 0.67

277 04197500 B 4.28 9.17 1.41

278 04198000 B 1,251 3.75 1.06

279 04198100 A 4.92 15.4 0.12

280 04198500 A 85.5 15.1 0.97

281 04199000 A 371 9.38 1.02

282 04199155 A 22.1 30.9 1.55

283 04199500 A 262 6.93 1.68

284 04199800 A 0.76 29.9 0.81

285 04200000 A 217 6.67 2.04

286 04200100 A 4.83 12.6 3.15

287 04200500 A 396 6.47 2.26

288 04201500 A 267 9.08 2.87

289 04202000 A 151 3.54 12.14

290 04206212 A 5.58 48.8 2.51

291 04206220 A 30.7 34.4 4.29

292 04207200 A 83.9 4.69 8.93

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)
Methods 9

Generalized Least-Squares Regression 

Analysis

Generalized least-squares (GLS) regression analyses 

were done using data from the same 305 streamflow-gaging 

stations used by Koltun (2003) with the exception that SL10-85

was substituted for the NHD-based main-channel slope characteristic used previously (fig. 1 and table 1). Otherwise, the 

techniques and streamflow-gaging station data used to 

develop the revised regression models are identical to those 

described by Koltun (2003) with the exceptions that no ordinary least-squares regression analyses were done and no 

attempt was made to reevaluate flood-region boundaries or 

alternative model forms. Readers who are interested in more 

information about GLS regression or aspects of model development are referred to Koltun (2003).

Table 2 shows summary statistics of the basin characteristics used to develop the revised equations. Appendix B 

contains descriptions of the characteristics listed in table 2.

The revised GLS regression full-model equations are 

shown in table 3. SL10-85 was statistically significant 

(p ≤ 0.0001) in the revised equations. Average standard errors 

of prediction for the full-model equations presented in this 

report increased by a small amount over those reported by 

Koltun (2003), with increases ranging from 0.7 to 0.9 percent. 

The simple-model equations reported by Koltun (2003) (table 

4) were not revised because they relate peak streamflows only 

to drainage area, which did not change.

Flood-frequency estimates determined by means of the 

revised full-model equations are reported in table 5 (page 17) 

along with the at-site log-Pearson Type III estimates and estimates determined as a weighted average of the at-site logPearson Type III estimate and the regression estimate (see 

Koltun, 2003, for a discussion of the weighting technique). 

Mean percentage changes in the revised regression and 

weighted flood-frequency estimates relative to regression and 

weighted estimates reported by Koltun (2003) were small, 

ranging from -0.72 to -0.25 percent and -0.22 to 0.07 percent, 

respectively (table 6). In the most extreme case (corresponding to the 500-year recurrence interval), 80 percent of the 

revised weighted estimates changed by no more than 2.54 percent (table 6). The revised weighted estimates reported in 

table 5 do not necessarily supersede those reported by Koltun 

(2003). They merely represent alternative estimates based on 

a different set of explanatory variables.

The revision to the full-model equation necessitated 

revision of the matrices, model error variances, and maximum 

mean-square sampling errors required to determine confidence intervals and to test for extrapolation. Those revisions 

are reported in appendix A.

293 04208000 A 707 6.97 9.45

294 04209000 A 246 13.3 5.48

295 04210000 A 25.6 20 12.47

296 04210090 A 0.29 47.9 1.12

297 04210100 A 5.42 25.3 25.84

298 04211000 A 69.2 2.46 17.91

299 04211500 A 82 9.08 18.52

300 04212000 A 581 1.53 16.42

301 04212100 A 685 2.33 15.18

302 04212500 A 121 11.4 17.74

303 04212600 A 0.88 101 6.48

304 04213000 A 175 6.71 3.10

305 04213040 A 2.53 55.8 6.27

Table 1. Selected basin characteristics of streamflowgaging stations—Continued

[Bold station numbers indicate peak streamflows at this station presently 

(2006) are considered regulated. Station names and locations are given 

in table 5. Abbreviations: DA, drainage area; SL10-85, channel slope 

determined by 10-85 method; W, percentage of the basin area classified 

in the National Land Cover Dataset as the sum of water and wetlands; 

nd, not determined; ft/mi, feet per mile; mi2

, square miles]

Map

ID

(fig. 1)

Station

number Region DA(mi2

)

SL10-85

(ft/mi)

W

(%)
10 A Streamflow Statistics (StreamStats) Web Application for Ohio

Figure 1. Locations of streamflow-gaging stations used in the analyses.
Methods 11

where RC is the regression constant for a region taken from the following matrix:

Table 2. Statistics of selected basin characteristics, by region, for streamflow-gaging stations used in the 

regression analyses

[DA, drainage area; SL10-85, channel slope determined by 10-85 method; W, percentage of the basin classified as water and wetlands; mi2, 

square miles; ft/mi, feet per mile]

Region Statistic DA

(mi2

)

SL10-85

(ft/mi)

W

(percent)

A

Maximum

Minimum

Mean

Median

7,422

.01

290.5

64.3

674

1.53

49.3

11.5

25.8

.00

2.13

0.67

B

Maximum

Minimum

Mean

Median

6,330

.04

414

60.6

457

1.21

25.6

7.17

7.78

.00

1.95

1.28

C

Maximum

Minimum

Mean

Median

1,713

.25

192.

68.7

343

4.03

42.0

15.8

1.13

.00

.39

.26

Table 3. Full-model equations for estimating flood-peak discharges of rural, unregulated 

streams in Ohio

[Qt, flood-peak discharge with a t-year recurrence interval, in cubic feet per second; DA, drainage area in square miles; 

SL10-85, channel slope in feet per mile determined from 10-85 method; W, percentage of the drainage area classified in the 1992 

National Land Cover Dataset as open water and wetlands]

Equation

number Equation

Average

 standard error 

of 

prediction

(percent)

Average

 equivalent

 years of

 record

1 Q2 = (RC)(DA)

0.777(SL10-85)0.130(W+1)-0.187 37.0 2.1

2 Q5 = (RC)(DA)

0.764(SL10-85)0.170(W+1)-0.232 34.6 3.3

3 Q10 = (RC)(DA)

0.761(SL10-85)0.191(W+1)-0.253 34.4 4.4

4 Q25 = (RC)(DA)

0.758(SL10-85)0.211(W+1)-0.273 35.4 5.9

5 Q50 =(RC)(DA)

0.757(SL10-85)0.222(W+1)-0.285 36.5 6.8

6 Q100 = (RC)(DA)

0.757(SL10-85)0.232(W+1)-0.295 37.9 7.5

7 Q500 = (RC)(DA)

0.756(SL10-85)0.251(W+1)-0.314 42.1 8.6

Region Q2 Q5 Q10 Q25 Q50 Q100 Q500

A 71.4 111.1 136.8 168.7 191.9 214.7 266.0

B 50.4 75.8 91.1 108.9 121.3 132.9 157.5

C 115.6 171.4 205.4 246.2 275.2 303.1 363.8
12 A Streamflow Statistics (StreamStats) Web Application for Ohio

StreamStats

The Ohio implementation of StreamStats allows a user to 

select any point in Ohio (excepts points in the Ohio River and 

Lake Erie proper) by means of a Web-based GIS interface. 

Points can not be selected until the display is sufficiently 

zoomed in so that the “BasinDelineation” button is active (not 

greyed out). Once the BasinDelineation button is active and has 

been selected, a point can be selected by left-clicking on it. 

StreamStats then determines and displays the boundary of the 

area that drains to that point3

 and requests confirmation that the 

displayed drainage boundary is correct. If the drainage boundary is not correct because the point selected lies off the intended 

location, the boundary can be rejected and a new point selected. 

If instead the drainage boundary is not correct due to other factors (for example, two areas that are separated by what would 

otherwise be a drainage divide could be connected by a culvert; 

however, that connection might not be reflected in NHD or the 

DEM), the derived basin boundary can be confirmed and later 

modified manually with the “EditBasin” tool built into the 

StreamStats interface. Once an acceptable drainage boundary 

has been defined, StreamStats can determine the other basin 

characteristics required to compute the desired streamflow statistics by selecting the “FlowStats” button on the StreamStats 

toolbar. After StreamStats computes basin characteristics for a 

point of interest, the characteristics are passed to the USGS 

National Streamflow Statistics Program (NSS) (formerly 

referred to as the National Flood Frequency Program (Ries and 

others, 2002)), which computes estimates of the streamflow statistics. Depending on how a particular regression model was 

developed and what information is supplied, NSS may compute 

confidence limits for a streamflow statistic. The streamflow statistics and confidence limits (if applicable) are returned to the 

StreamStats Web interface and displayed in a pop-up window. 

3Determination of the drainage boundary involves an on-the-fly 

delineation using the DEM from the point of interest up to where the 

dynamically determined boundary intersects with a static predetermined basin boundary. The dynamically determined boundary is 

merged with the static predetermined boundary to form the total drainage boundary.

where RC is the regression constant for a region taken from the following matrix:

Table 4. Simple (drainage-area only) equations for estimating flood-peak discharges of rural, 

unregulated streams in Ohio

[Qt, flood-peak discharge with a t-year recurrence interval, in cubic feet per second; DA, drainage area in square miles]

Equation

number Equation

Average

 standard error 

of 

prediction

(percent)

Average

 equivalent

 years of

 record

1 Q2 = (RC)(DA)

0.716 39.6 1.9

2 Q5 = (RC)(DA)

0.686 39.0 2.6

3 Q10 = (RC)(DA)

0.674 39.5 3.4

4 Q25 = (RC)(DA)

0.663 41.1 4.4

5 Q50 = (RC)(DA)

0.657 42.7 5.1

6 Q100 = (RC)(DA)

0.652 44.4 5.7

7 Q500 =(RC)(DA)

0.644 49.0 6.6

Region Q2 Q5 Q10 Q25 Q50 Q100 Q500

A 106.3 186.1 244.4 321.0 379.6 439.1 582.3

B 69.1 114.9 146.1 184.9 213.0 240.5 302.5

C 188.6 322.7 417.5 539.3 630.6 721.9 936.9
Limitations 13

StreamStats has a “Download” button that initiates 

download of a shapefile4

 of the drainage boundary that can be 

imported into a local GIS. StreamStats attributes the basin 

boundary shapefile (called GlobalWatershed) with the computed basin characteristics and streamflow statistic estimates. 

StreamStats also has a variety of other features such as the ability to (1) trace upstream or downstream from a point on the 

NHD streamline, (2) zoom to a NHD reach address, and (3) 

determine the NHD reach address for a user-selected reach. 

Information on these and other features can be obtained by 

clicking on the “Help” button in the StreamStats application.

The StreamStats application for Ohio implements the the 

full-model flood-frequency equations contained in this report. It 

also implements the best-fit streamflow statistics equations for 

mean annual streamflow, mean monthly streamflows, harmonic 

mean streamflow, and 25th-, 50th-, and 75th-percentile streamflows presented by Koltun and Whitehead (2002). Links to the 

Ohio implementation of StreamStats can be found on the 

StreamStats Web page at http://streamstats.usgs.gov.

Limitations

Estimates of streamflow statistics provided by StreamStats are based on the assumption that streamflow is not appreciably regulated with respect to the statistic being estimated. It 

should not be assumed that StreamStats will provide any warning about the presence (or possible presence) of streamflow regulation. Consequently, it is the user’s responsibility to ensure 

that streamflows are regulated, or to adjust estimates appropriately to account for its effect. Factors other than regulation (significant urbanization, for example) can result in altered 

streamflows, which can invalidate the estimates provided by 

StreamStats. Here again, it is the user’s responsibility to evaluate those factors to ensure that the regressions equations are not 

being misapplied. To that end, users are strongly encouraged to 

review the original reports on the regression models (Koltun, 

2003; Koltun and Whitehead, 2002) which describe the limitations of the equations implemented in StreamStats.

StreamStats compares basin characteristics that it computes against the range of values used to develop the applicable 

regression equations. If the magnitude of a computed basin 

characteristic is outside of the range of values used to develop 

the regression equation, StreamStats displays a warning along 

with the estimates of the statistics. In those cases, the estimate 

represents an extrapolation which can result in larger than 

expected error. Extrapolations should be avoided if possible, 

particularly if one or more basin characteristics determined by 

StreamStats lies appreciably outside the range of values used for 

model development.

4Shapefiles are actually groups of files sharing a common root 

file name. Shapefiles minimally consist of a main file, an index file, 

and a database file. Geometric features are stored as a set of vector 

coordinates with associated attribute information. Shapefiles do not 

explicitly store topological relationships. 

Table 6. Statistics of percent differences between old and new flood-frequency estimates 

[old flood-frequency estimates are from Koltun (2003); all statistics based on 305 observations]

Estimate

type Statistic

Statistics of differences between old and new flood-frequency estimates 

expressed as a percentage of the old flood-frequency estimates

2-year 5-year 10-year 25-year 50-year 100-year 500-year

Regression

estimates

mean -0.30 -0.25 -0.31 -0.40 -0.54 -0.58 -0.72

median 0.00 0.00 0.00 -0.20 0.00 -0.24 -0.63

10th percentile -7.27 -8.26 -8.95 -9.69 -10.24 -10.44 -11.45

90th percentile 6.64 7.87 8.33 8.57 8.59 8.78 9.24

Weighted

estimates

mean 0.07 0.04 -0.01 -0.03 -0.09 -0.13 -0.22

median 0.00 0.00 0.00 0.00 0.00 0.00 0.00

10th percentile -0.74 -1.02 -1.33 -1.56 -1.89 -2.06 -2.54

90th percentile 0.76 0.98 1.36 1.63 1.81 2.10 2.45
14 A Streamflow Statistics (StreamStats) Web Application for Ohio

The geospatial datasets used by StreamStats represent 

discrete approximations of continuous spatial characteristics. 

Although we have attempted to use the best available data, there 

may be errors in the datasets or other factors that result in determination of inaccurate basin-characteristic measures or incorrect basin boundaries. For example, in extremely low relief 

areas, the digital elevation model may not be sufficiently 

resolved to accurately detect some basin divides. Also, it is possible that the geospatial datasets don’t reflect the current conditions on the landscape such as might arise if a stream channel 

had been rerouted subsequent to the creation of the spatial 

dataset. Another possible scenario that can lead to inaccuracies 

in basin-characteristic measures and basin boundaries is that in 

which a sufficiently elevated roadway embankment spans from 

one point on the topographic divide to another point on the 

divide within the same basin, resulting in what appears (on the 

basis of the DEM alone) to be a new topographic divide.

Because map-based drainage areas were used to develop 

regression estimates presented in this report, streamflow statistic estimates derived by selecting a gage location within 

StreamStats may differ somewhat from those reported in table 

5. Although differences between map-based drainage areas and 

those determined by StreamStats were generally small (averaging about 0.2 percent of the map-based value), map-based 

drainage areas were used to develop the regression equations 

and estimates because it was felt that they were the most accurate drainage areas available. In some cases, the map-based 

drainage areas were based in part on field inspections or surveys 

in areas where locations of basin divides could not be ascertained with reasonable certainty from a topographic map.

Acknowledgments

The authors thank Laura Simonson, hydrologist with the 

USGS, for her efforts related to quality assuring and correcting 

hypsographic coverages used to derive the DEM developed for 

this study.

Summary

StreamStats is a Web-based GIS application for serving 

predetermined streamflow statistics and computing estimates of 

streamflow statistics at ungaged locations. A StreamStats application was developed for Ohio that implements the full-model 

flood-frequency equations contained in this report and best-fit 

streamflow statistics equations for mean annual streamflow, 

mean monthly streamflows, harmonic mean streamflow, and 

25th-, 50th-, and 75th-percentile streamflows presented by Koltun and Whitehead (2002). Links to the Ohio implementation of 

StreamStats can be found on the StreamStats Web page at 

http://streamstats.usgs.gov.

To facilitate the level of automation required for the 

StreamStats application, a new computationally robust technique for estimating channel slope was implemented. The new 

channel slope characteristic, referred to as SL10-85, differed 

from the NHD-based main-channel slope values (SL) reported 

by Koltun (2003) by an average of -28.3 percent, with the 

median change being -13.2 percent. In spite of the differences, 

the two slope measures are strongly correlated and consequently should provide nearly the same information in regression models.

The change in channel slope values necessitated revision 

of the full-model equations for flood-peak discharges presented 

by Koltun (2003). Average standard errors of prediction for the 

revised full-model equations presented in this report increased 

by a small amount over those reported by Koltun (2003), with 

increases ranging from 0.7 to 0.9 percent. Mean percentage 

changes in the revised regression and weighted flood-frequency 

estimates relative to regression and weighted estimates reported 

by Koltun (2003) were small, ranging from -0.72 to -0.25 percent and -0.22 to 0.07 percent, respectively.

References

Environmental Systems Research Institute 2005, ArcInfo ver. 8 

manual (on-line documentation), Environmental Systems 

Research Institute (ESRI), Corp. Redlands, CA

Hellweger, F.L. 1997, AGREE - DEM Surface Reconditioning 

System: University of Texas at Austin, accessed July 5, 

2006 at http://www.ce.utexas.edu/prof/maidment/gishydro/ferdi/research/agree/agree.html

Koltun, G.F., 2003, Techniques for Estimating Flood-Peak Discharges of Rural, Unregulated Streams in Ohio, Second 

Edition: U. S. Geological Survey Water-Resources Investigations Report 03-4164, 76 p

Koltun, G.F., and Whitehead, M.T., 2002, Techniques for Estimating Selected Streamflow Characteristics of Rural, 

Unregulated Streams in Ohio: U. S. Geological Survey 

Water-Resources Investigations Report 02-4068, 50 p.

Michigan Department of Environmental Quality, 1998, Watershed Boundary Data: Michigan Department of Environmental Quality, accessed June 3, 2006 at 

http://www.dnr.state.mi.us/spatialdatalibrary/sdl/

hydrography/watersheds/_Lower_Peninsula/

Lower_Peninsula_Watersheds_24k.exe

Natural Resources Conservation Service, 1999, Statewide 14-

digit Hydrologic Unit Dataset: Natural Resources Conservation Service, accessed on June 3, 2006, at 

ftp://ftp-fc.sc.egov.usda.gov/OH/pub/14-digit_ws/

Oh14dig.zip
References 15

Pennsylvania Department of Environmental Protection, 1998, 

Pennsylvania—104 State Water Plan watersheds, 1998: 

Pennsylvania Department of Environmental Protection, 

accessed on June 3, 2006, at ftp://pasda.cac.psu.edu/pub/

pasda/watersheds/sheds104.zip

Quigley, S.M., 2003, Flood regions for Ohio: U.S. Geological 

Survey data available on the World Wide Web at URL 

http://water.usgs.gov/lookup/getspatial?floodregions

Ries, K.G., III, and Crouse, M.Y., 2002, The National Flood 

Frequency Program, Version 3: A Computer Program for 

Estimating Magnitude and Frequency of Floods for 

Ungaged Sites, 2002: U.S. Geological Survey WaterResources Investigations Report 02-4168, 42 p.

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

D.W., 2004, StreamStats: A U.S. Geological Survey Web 

Application for Stream Information; U.S. Geological Survey Fact Sheet FS 2004-3115, 4 p.

Sherwood, J. M., 1993, Estimation of flood volumes and simulation of flood hydrographs for ungaged small rural 

streams in Ohio: U. S. Geological Survey Water-Resources 

Investigations Report 93-4080, 52 p.

Straub, D.E., 2001, Low-Flow Characteristics of Streams in 

Ohio through Water Year 1997: U. S. Geological Survey 

Water-Resources Investigations Report 01-4140, 416 p.

U.S. Geological Survey, 2000, National Land Cover Dataset 

(version 03-16-2000): U.S. Geological Survey, accessed 

on June 3, 2006, at http://landcover.usgs.gov/natllandcover.php

U.S. Geological Survey, 2004, The National Hydrography 

Dataset: U.S. Geological Survey, accessed June 3, 2006 at 

http://nhd.usgs.gov

U.S. Geological Survey, 1999, Digital Data Set of 14-Digit 

Hydrologic Units in Indiana: U.S. Geological Survey, 

accessed June 3, 2006 at http://in.water.usgs.gov/cdfactsheet/index.shtml

Whitehead, M.T., 2002a, Mean annual precipitation for Ohio, 

1931-80: U.S. Geological Survey data available on the 

Web, accessed June 3, 2006 at 

http://water.usgs.gov/lookup/getspatial?raintin

Whitehead, M.T., 2002b, Streamflow variability indices for 

Ohio: U.S. Geological Survey data available on the Web, 

accessed June 3, 2006 at 

http://water.usgs.gov/lookup/getspatial?varindexgrid
16 A Streamflow Statistics (StreamStats) Web Application for Ohio

FLOOD FREQUENCY TABLE
Table 5. Flood-frequency data for streamflow-gaging stations[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u

1 03022500 French Creek at Saegerstown, Pa. 41°42′50′′ 80°08′50′′ 10,500 13,800 15,900 18,500 20,400 22,300 26,600 19 1

192

10,000 14,400 17,500 21,300 24,100 26,900 33,50010,400 13,900 16,100 19,000 21,100 23,200 28,000

2 03023000 Cussewago Creek near 

Meadville, Pa.

41°40′20′′ 80°12′55′′ 1,540 2,110 2,540 3,130 3,610 4,130 5,500 28 191

2,050 2,970 3,590 4,360 4,930 5,490 6,7901,560 2,160 2,620 3,250 3,760 4,300 5,690

3 03086100 Big Sewickley Creek 

near Ambridge, Pa.

40°36′27′′ 80°09′49′′ 622 1,010 1,320 1,790 2,180 2,630 3,870 16 196

988 1,730 2,280 3,010 3,570 4,140 5,510659 1,110 1,500 2,070 2,540 3,050 4,400

4 03086500 Mahoning River at 

Alliance

40°55′58′′ 81°05′41′′ 2,120 3,380 4,380 5,840 7,090 8,490 12,400 60 194

2,500 3,820 4,740 5,900 6,770 7,630 9,6502,130 3,390 4,390 5,850 7,070 8,410 12,100

5 03087000 Beech Creek near 

Bolton

40°55′50′′ 81°08′50′′ 1,080 1,580 1,910 2,310 2,600 2,890 3,530 12 194

1

818 1,330 1,690 2,160 2,510 2,860 3,690

1,040 1,530 1,850 2,260 2,570 2,880 3,600

6 03088000 Deer Creek at Limaville 40°58′45′′ 81°09′35′′ 1,060 1,340 1,540 1,790 1,990 2,190 2,690 15 194

1

956 1,410 1,720 2,100 2,390 2,660 3,310

1,050 1,350 1,560 1,840 2,050 2,270 2,800

7 03089500 Mill Creek near Berlin 

Center

41°00′01′′ 80°58′07′′ 972 1,360 1,620 1,940 2,180 2,420 2,980 36 194

714 1,100 1,360 1,690 1,930 2,170 2,730959 1,340 1,600 1,910 2,150 2,390 2,940

8 03090500 Mahoning River 

below Berlin Dam near Berlin Center

41°02′54′′ 81°00′05′′ 5,560 7,410 8,530 9,850 10,800 11,700 13,600 12 193

4,630 6,640 8,000 9,710 11,000 12,200 15,1005,430 7,260 8,400 9,810 10,800 11,900 14,100
9 03092000 Kale Creek near Price- town 41°08′23′′ 80°59′43′′ 1,090 1,660 2,100 2,750 3,300 3,920 5,630 52 194

748 1,130 1,400 1,730 1,970 2,210 2,770 1,080 1,630 2,050 2,640 3,140 3,680 5,160 10 03092090 West Branch Mahoning River near Ravenna 41°09′41′′ 81°11′50′′ 922 1,310 1,590 1,960 2,250 2,550 3,300 36 196

736 1,120 1,370 1,700 1,940 2,180 2,730 914 1,300 1,570 1,930 2,210 2,500 3,210 11 03092100 Hinkley Creek near Charlestown 41°09′10′′ 81°10′05′′ 334 499 625 805 955 1,120 1,560 23 194450 700 871 1,090 1,250 1,400 1,770 341 516 653 847 1,000 1,170 1,610 12 03092500 West Branch Mahoning River near Newton Falls 41°10′18′′ 81°01′16′′ 2,570 3,730 4,530 5,590 6,400 7,230 9,270 40 192

2,290 3,380 4,110 5,040 5,730 6,410 7,980 2,560 3,710 4,500 5,540 6,330 7,130 9,090 13 03092600 Ordnance Creek near 

Newton Falls

41°11′20′′ 81°01′05′′ 37 66 89 121 147 175 246 13 195

27 47 61 79 93 107 13935 60 78 102 120 139 185

14 03093000 Eagle Creek at Phalanx Station 41°15′40′′ 80°57′16′′ 2,680 3,780 4,500 5,400 6,050 6,700 8,200 72 192

193

2,150 3,120 3,770 4,580 5,170 5,760 7,1302,670 3,760 4,470 5,360 6,000 6,640 8,120

15 03094900 Walnut Creek at Cortland 41°19′49′′ 80°43′28′′ 487 816 1,050 1,370 1,610 1,860 2,460 31 194

342 520 640 789 898 1,010 1,260479 789 1,000 1,280 1,480 1,690 2,190

16 03096000 Mosquito Creek at 

Niles

41°11′02′′ 80°45′39′′ 1,580 2,450 3,060 3,840 4,450 5,050 6,510 14 193

2,510 3,500 4,150 4,960 5,550 6,130 7,4701,630 2,540 3,180 4,020 4,640 5,260 6,720

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
17 03098500 Mill Creek at Youngstown 41°04′19′′ 80°41′26′′ 1,470 2,410 3,190 4,350 5,360 6,510 9,790 35 1

194

1,680 2,470 2,990 3,650 4,140 4,620 5,7301,480 2,420 3,170 4,280 5,220 6,260 9,140

18 03098700 Crab Creek at Youngstown 41°07′20′′ 80°38′08′′ 671 857 982 1,140 1,270 1,390 1,700 24 195

621 993 1,260 1,590 1,840 2,090 2,680668 866 1,010 1,190 1,340 1,490 1,840

19 03102900 Clear Creek at Dilworth 41°26′45′′ 80°39′56′′ 64 123 175 254 324 404 632 31 194

100 169 218 281 328 375 485

66 127 180 258 325 398 595

20 03102950 Pymatuning Creek at 

Kinsman

41°26′34′′ 80°35′18′′ 1,420 1,960 2,310 2,720 3,010 3,290 3,900 36 196

1,890 2,650 3,150 3,760 4,210 4,650 5,6601,430 1,990 2,360 2,800 3,110 3,420 4,090

21 03104760 Harthegig Run near 

Greenfield, Pa.

41°11′10′′ 80°19′38′′ 175 273 342 434 505 577 756 12 196

167 281 362 466 544 622 806174 274 347 444 519 594 777

22 03106000 Connoquenessing 

Creek near Zelienople, Pa.

40°49′01′′ 80°14′33′′ 7,970 10,700 12,600 15,100 17,000 19,000 23,800 86 191

8,290 12,700 15,800 19,800 22,800 25,800 32,9007,980 10,800 12,800 15,400 17,400 19,500 24,600

23 03106500 Slippery Rock Creek 

at Wurtemburg, Pa.

40°53′02′′ 80°14′02′′ 7,480 10,900 13,200 16,100 18,400 20,600 26,000 57 191

193

7,120 10,300 12,500 15,300 17,400 19,400 24,1007,470 10,800 13,100 16,100 18,300 20,500 25,900

24 03108000 Raccoon Creek at 

Moffatts Mill, Pa.

40°37′40′′ 80°20′16′′ 3,720 5,550 6,820 8,490 9,770 11,100 14,300 76 191

194

199

3,500 5,290 6,480 7,930 8,970 9,970 12,2003,710 5,540 6,800 8,450 9,700 11,000 14,000

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
25 03109000 Lisbon Creek at Lisbon 40°46′55′′ 80°45′53′′ 382 614 797 1,060 1,290 1,540 2,230 35 194

464 815 1,080 1,420 1,680 1,950 2,590 387 630 828 1,110 1,350 1,610 2,300 26 03109500 Little Beaver Creek near East Liverpool 40°40′33′′ 80°32′27′′ 8,980 13,300 16,400 20,600 24,000 27,600 36,800 86 191

9,820 14,800 18,200 22,700 26,000 29,300 37,100 8,990 13,300 16,400 20,700 24,100 27,700 36,800 27 03110000 Yellow Creek near Hammondsville 40°32′16′′ 80°43′31′′ 3,020 4,390 5,420 6,840 8,000 9,240 12,500 61 194

2,820 4,220 5,140 6,260 7,050 7,810 9,520 3,010 4,390 5,400 6,800 7,910 9,100 12,200 28 03110980 Consol Run at Bloom- ingdale 40°19′56′′ 80°48′44′′ 6 12 17 24 30 37 55 10 197

9 18 25 34 41 48 64 7 15 21 30 37 44 61 29 03111150 Brush Run near Buffalo, Pa. 40°11′54′′ 80°24′28′′ 533 933 1,240 1,670 2,010 2,380 3,310 21 196

198

490 826 1,060 1,350 1,570 1,780 2,250529 917 1,200 1,590 1,880 2,190 2,940

30 03111450 Branson Run at Georgetown 40°12′26′′ 80°55′22′′ 58 102 139 193 239 290 433 11 197

1

95 164 212 272 315 357 45364 117 162 223 272 321 443

31 03111455 South Fork Short 

Creek at Georgetown

40°12′27′′ 80°55′12′′ 224 360 461 601 714 834 1,140 11 197

1

375 586 727 896 1,020 1,130 1,390244 402 525 691 817 944 1,250

32 03111470 Little Piney Fork at 

Parlett

40°18′07′′ 80°50′55′′ 63 129 191 291 385 497 839 10 197

105 179 231 294 340 385 487

69 141 204 293 365 441 638

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
33 03111490 Piney Fork tributary 

near Piney Fork

40°16′18′′ 80°50′48′′ 15 26 35 50 63 78 125 10 197

43 75 99 128 149 169 21620 39 56 81 102 123 175

34 03111500 Short Creek near Dillonvale 40°11′36′′ 80°44′04′′ 2,820 4,120 4,970 6,020 6,780 7,530 9,220 60 194

2,410 3,600 4,390 5,350 6,030 6,680 8,1502,810 4,100 4,940 5,970 6,720 7,450 9,110

35 03111540 Sloan Run tributary 

near Harrisville

40°09′07′′ 80°52′59′′ 49 133 224 388 551 756 1,430 10 197

63 124 171 236 286 338 46552 130 199 301 386 478 726

36 03111548 Wheeling Creek below 

Blaine

40°04′01′′ 80°48′31′′ 2,620 4,040 5,030 6,320 7,300 8,290 10,700 18 198

198

3,050 4,800 6,040 7,630 8,830 10,000 12,9002,650 4,140 5,200 6,600 7,660 8,730 11,300

37 03112000 Wheeling Creek at 

Elm Grove, W. Va.

40°02′40′′ 80°39′40′′ 9,120 13,700 16,800 21,100 24,300 27,700 36,000 60 194

7,290 11,400 14,400 18,200 21,100 24,000 30,9009,040 13,500 16,700 20,800 24,000 27,200 35,300

38 03113700 Little Grave Creek 

near Glendale, W. Va.

39°57′40′′ 80°42′04′′ 495 940 1,310 1,870 2,340 2,870 4,320 12 197

1

199

462 853 1,160 1,560 1,870 2,190 2,980489 918 1,260 1,750 2,140 2,560 3,650

39 03114000 Captina Creek at Armstrongs Mills 39°54′31′′ 80°55′27′′ 6,120 9,320 11,600 14,700 17,100 19,600 25,900 52 192

195

4,010 6,340 8,000 10,100 11,700 13,400 17,2006,030 9,150 11,300 14,200 16,500 18,800 24,600

40 03114240 Wood Run near 

Woodsfield

39°46′56′′ 81°03′21′′ 65 133 192 284 365 456 713 10 197

82 157 215 293 353 414 56569 140 201 288 359 433 624

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
41 03114500 Middle Island Creek at Little, W. Va. 39°28′30′′ 80°59′50′′ 13,500 17,600 20,400 23,900 26,600 29,300 35,900 79 1

191192

1

9,450 14,200 17,500 21,700 24,900 28,000 35,400 13,400 17,500 20,300 23,800 26,500 29,200 35,800 42 03114550 Buffalo Run near Friendly, W. Va. 39°30′23′′ 81°01′41′′ 207 369 493 665 804 950 1,320 12 196

116 218 295 398 478 559 757 184 317 411 537 635 737 993 43 03114600 Little Buffalo Run near Friendly, W. Va. 39°30′10′′ 81°00′59′′ 254 416 535 697 825 959 1,290 11 196

156 294 401 543 653 766 1,040 228 375 481 625 739 857 1,150 44 03115280 Trail Run near Antioch 39°37′29′′ 81°02′54′′ 629 979 1,260 1,670 2,030 2,420 3,530 10 197457 822 1,100 1,470 1,750 2,040 2,730 591 934 1,200 1,590 1,900 2,230 3,110 45 03115400 Little Muskingum 

River at Bloomfield

39°33′47′′ 81°12′14′′ 7,340 10,900 13,600 17,400 20,600 24,000 33,100 29 195

199

5,400 8,310 10,400 13,000 14,900 16,900 21,5007,210 10,700 13,200 16,700 19,500 22,500 30,200

46 03115410 Graham Run near 

Bloomfield

39°32′36′′ 81°12′52′′ 20 40 58 84 106 130 194 10 197

31 62 86 119 145 172 23823 49 72 104 129 156 223

47 03115500 Little Muskingum 

River at Fay

39°28′48′′ 81°17′09′′ 7,650 11,200 13,600 16,900 19,500 22,100 28,600 20 191

6,070 9,200 11,400 14,200 16,200 18,300 23,1007,510 10,900 13,300 16,400 18,700 21,200 27,100

48 03115510 Moss Run near 

Wingett

39°28′24′′ 81°18′52′′ 221 369 493 681 847 1,040 1,590 10 197

181 338 458 619 743 870 1,180

211 359 479 652 794 947 1,350

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
49 03115600 Barnes Run near Summerfield 39°46′20′′ 81°22′26′′ 540 1,090 1,580 2,350 3,060 3,870 6,290 33 194

308 551 733 973 1,160 1,340 1,800518 1,010 1,420 2,010 2,520 3,080 4,650

50 03115710 Buffalo Run tributary 

near Dexter City

39°39′41′′ 81°26′58′′ 44 52 58 64 69 74 86 10 197

38 74 102 140 169 199 27342 60 75 97 115 134 178

51 03115973 Schocalog Run at 

Copley Junction

41°06′11′′ 81°36′12′′ 114 134 146 159 168 176 194 10 199

130 194 234 280 313 344 411

117 148 171 199 220 239 280

52 03116000 Tuscarawas River at 

Clinton

40°55′40′′ 81°37′58′′ 1,320 1,810 2,130 2,530 2,840 3,140 3,850 53 1

192

2,450 3,420 4,040 4,770 5,270 5,760 6,8201,340 1,850 2,200 2,640 2,970 3,290 4,050

53 03116100 Little Chippewa Creek 

near Smithville

40°53′39′′ 81°48′46′′ 739 1,150 1,440 1,820 2,120 2,430 3,180 26 194

538 836 1,030 1,270 1,440 1,600 1,960723 1,110 1,370 1,710 1,960 2,220 2,830

54 03116200 Chippewa Creek at 

Easton

40°56′47′′ 81°44′35′′ 1,800 3,070 4,250 6,210 8,080 10,400 17,900 23 195

2,430 3,490 4,170 4,990 5,560 6,110 7,3101,830 3,110 4,240 6,000 7,570 9,390 14,800

55 03117000 Tuscarawas River at 

Massillon

40°46′13′′ 81°31′27′′ 4,120 5,440 6,330 7,480 8,350 9,230 11,400 63 193

5,770 7,940 9,310 10,900 12,100 13,200 15,6004,150 5,500 6,430 7,630 8,540 9,460 11,700

56 03117500 Sandy Creek at 

Waynesburg

40°40′21′′ 81°15′36′′ 3,400 4,830 5,860 7,240 8,330 9,470 12,400 63 193

3,390 4,700 5,530 6,500 7,190 7,840 9,2603,400 4,830 5,850 7,190 8,240 9,330 12,000

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
57 03118000 Middle Branch Nimishillen Creek at Canton 40°50′29′′ 81°21′14′′ 629 935 1,170 1,500 1,780 2,080 2,890 60 194

842 1,200 1,420 1,670 1,850 2,020 2,390 634 944 1,180 1,510 1,780 2,070 2,840 58 03118500 Nimishillen Creek at North Industry 40°44′03′′ 81°21′08′′ 3,140 4,410 5,260 6,330 7,130 7,930 9,820 80 192

2,810 4,040 4,830 5,770 6,430 7,070 8,470 3,140 4,400 5,240 6,300 7,080 7,870 9,720 59 03119000 Sandy Creek at Sandyville 40°38′04′′ 81°22′28′′ 7,200 10,500 12,700 15,300 17,200 19,000 23,000 24 192

5,680 7,880 9,270 10,900 12,100 13,200 15,700 7,100 10,300 12,300 14,600 16,300 17,800 21,400 60 03119700 Conotton Creek at Jewett 40°21′59′′ 81°00′13′′ 491 753 938 1,180 1,370 1,560 2,020 35 194

554 901 1,140 1,430 1,650 1,850 2,320 494 764 957 1,210 1,410 1,600 2,070 61 03122500 Tuscarawas River 

below Dover Dam near Dover

40°31′47′′ 81°25′48′′ 15,000 20,800 24,700 29,900 33,900 38,000 47,900 15 1

192

12,300 16,500 19,100 22,300 24,500 26,600 31,30014,800 20,300 24,000 28,500 32,000 35,400 43,700

62 03123400 Dundee Creek at 

Dundee

40°35′35′′ 81°36′13′′ 147 273 369 498 600 704 956 21 196

66 117 154 200 234 267 343

130 227 290 368 425 483 620

63 03125000 Home Creek near New 

Philadelphia

40°28′06′′ 81°24′10′′ 121 210 274 356 419 481 624 43 193

129 230 302 393 460 526 678122 213 278 363 427 491 638

64 03125300 West Branch Spencer 

Creek at Hendrysburg

40°03′30′′ 81°09′30′′ 202 420 596 846 1,050 1,260 1,780 16 195

220 396 528 702 835 971 1,300204 415 578 797 968 1,140 1,570

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
65 03125450 Robinson Run near 

Hendrysburg

40°05′08′′ 81°10′27′′ 97 130 150 174 191 207 244 10 197

204 372 499 667 796 927 1,240

114 177 231 308 369 431 572

66 03127950 Clear Fork near Jewett 40°19′28′′ 81°01′20′′ 209 380 534 782 1,010 1,290 2,140 11 197

1

277 466 598 762 880 996 1,260218 398 551 775 961 1,160 1,700

67 03128650 Mud Run tributary at 

Wainwright

40°25′07′′ 81°24′57′′ 11 19 26 37 47 58 89 10 197

73 134 180 241 287 334 44816 35 55 87 114 143 216

68 03129000 Tuscarawas River at 

Newcomerstown

40°15′41′′ 81°36′33′′ 21,300 31,100 38,400 48,500 56,600 65,300 88,200 17 1

192

19,600 26,300 30,500 35,600 39,200 42,600 50,10021,100 30,600 37,300 46,100 52,900 60,000 77,800

69 03129012 White Eyes Creek tributary near 

Coshocton

40°21′41′′ 81°47′52′′ 3 11 20 38 56 80 160 19 194

5 10 14 20 25 30 424 10 17 26 34 42 64

70 03129014 White Eyes Creek tributary near 

Coshocton

40°21′36′′ 81°47′04′′ 99 212 321 507 686 905 1,610 65 193

76 149 206 283 343 405 55797 205 304 462 605 773 1,280

71 03129016 White Eyes Creek tributary near 

Coshocton

40°21′29′′ 81°46′53′′ 30 68 105 170 233 311 559 25 193

195

28 55 77 107 130 153 21129 65 97 147 190 238 376

72 03129300 Whetstone Creek tributary near Olivesburg 40°53′15′′ 82°24′25′′ 42 71 93 124 150 177 249 28 195

37 68 91 121 143 166 22142 71 93 123 148 174 239

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
73 03130500 Touby Run at Mans- field 40°45′53′′ 82°32′43′′ 403 627 788 1,010 1,180 1,350 1,790 33 194

1

329 543 696 892 1,040 1,190 1,530 398 619 777 988 1,150 1,320 1,740 74 03132000 Clear Fork at Butler 40°35′37′′ 82°25′20′′ 3,310 5,430 7,250 10,100 12,700 15,800 25,100 31 194

1

3,370 5,070 6,240 7,720 8,820 9,910 12,500 3,310 5,400 7,160 9,830 12,200 14,800 22,600 75 03134000 Jerome Fork at Jerom- eville 40°48′07′′ 82°12′01′′ 2,540 4,090 5,430 7,590 9,570 11,900 19,200 31 1

192

1

196

196

3,450 5,360 6,700 8,420 9,700 11,000 14,000 2,580 4,160 5,540 7,680 9,590 11,800 18,300 76 03136000 Mohican River at Greer 40°30′53′′ 82°11′44′′ 10,700 15,100 18,200 22,300 25,500 28,800 37,200 17 1

192

15,700 22,900 28,000 34,400 39,200 43,900 55,100 11,000 15,800 19,300 24,100 27,800 31,600 40,900

77 03136500 Kokosing River at 

Mount Vernon

40°24′20′′ 82°30′00′′ 4,350 6,750 8,710 11,700 14,300 17,200 25,800 48 195

4,960 7,570 9,400 11,700 13,500 15,200 19,3004,380 6,800 8,770 11,700 14,200 16,900 24,600

78 03137000 Kokosing River at 

Millwood

40°23′51′′ 82°17′09′′ 9,730 16,300 21,700 29,600 36,400 44,000 65,400 54 1

192

9,170 13,800 17,000 21,100 24,100 27,200 34,4009,710 16,200 21,300 28,700 34,900 41,600 60,200

79 03138500 Walhonding River 

below Mohawk Dam at Nellie

40°20′29′′ 82°03′56′′ 19,600 28,900 34,900 42,200 47,500 52,600 63,900 17 1

192

23,100 33,800 41,300 50,900 58,000 65,200 81,90019,900 29,400 35,800 43,700 49,500 55,100 67,900

80 03138900 Jennings Ditch tributary near Wooster 40°44′45′′ 81°55′48′′ 76 195 331 600 895 1,300 2,830 18 1

196

123 232 315 428 514 603 819

81 202 327 541 742 983 1,740

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
81 03139000 Killbuck Creek at Killbuck 40°28′53′′ 81°59′10′′ 3,340 5,370 7,210 10,300 13,100 16,700 28,100 71 193

7,840 11,200 13,600 16,500 18,600 20,800 25,7003,410 5,510 7,420 10,600 13,500 16,900 27,900

82 03139930 Little Mill Creek tributary near 

Coshocton

40°24′23′′ 81°48′11′′ 63 135 203 315 421 546 933 35 193

79 150 204 277 333 390 52965 137 203 307 399 503 801

83 03139940 Little Mill Creek near 

Coshocton

40°24′01′′ 81°47′54′′ 155 306 434 626 790 972 1,470 35 193

171 319 432 583 700 819 1,110156 308 434 618 770 935 1,370

84 03139960 Little Mill Creek near 

Coshocton

40°23′32′′ 81°48′24′′ 301 591 836 1,210 1,520 1,880 2,850 35 193

239 435 582 778 928 1,080 1,450296 572 795 1,120 1,380 1,670 2,420

85 03139970 Little Mill Creek tributary near 

Coshocton

40°23′33′′ 81°48′19′′ 26 65 105 173 237 315 552 34 193

40 80 111 152 185 219 30127 67 106 168 221 282 452

86 03139980 Little Mill Creek near 

Coshocton

40°23′03′′ 81°49′04′′ 414 810 1,140 1,620 2,020 2,470 3,650 35 193

352 631 841 1,120 1,330 1,550 2,070409 790 1,090 1,520 1,870 2,240 3,200

87 03139990 Little Mill Creek near 

Coshocton

40°21′51′′ 81°50′20′′ 701 1,420 2,080 3,180 4,210 5,440 9,290 36 1

193

513 894 1,180 1,550 1,830 2,110 2,800689 1,360 1,960 2,880 3,700 4,640 7,410

88 03140000 Mill Creek near 

Coshocton

40°21′46′′ 81°51′45′′ 1,230 2,360 3,440 5,250 7,000 9,150 16,200 65 193

1,340 2,250 2,910 3,770 4,420 5,070 6,6401,230 2,360 3,390 5,090 6,660 8,530 14,400

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
89 03140010 Spoon Creek tributary near Coshocton 40°22′01′′ 81°47′58′′ 22 57 92 154 212 283 503 31 194

26 50 70 95 115 136 185 22 56 87 135 177 224 356 90 03140020 Spoon Creek tributary near Coshocton 40°21′58′′ 81°48′04′′ 7 16 26 44 62 84 162 61 193

197

17 34 47 66 80 95 132 7 18 29 47 65 87 154 91 03140030 Spoon Creek tributary near Coshocton 40°21′27′′ 81°48′11′′ 14 33 50 78 104 133 214 30 194

13 26 37 51 63 75 104 13 31 46 68 86 106 157 92 03142200 Salt Fork near Cam- bridge 40°05′05′′ 81°27′20′′ 1,740 2,590 3,220 4,080 4,780 5,520 7,430 11 195

1,680 2,550 3,140 3,890 4,450 5,000 6,280 1,730 2,580 3,200 4,020 4,670 5,330 6,970 93 03144000 Wakatomika Creek 

near Frazeysburg

40°07′57′′ 82°08′53′′ 4,270 7,070 9,190 12,100 14,500 17,100 23,600 65 193

4,250 6,730 8,500 10,800 12,500 14,200 18,3004,270 7,050 9,140 12,000 14,300 16,700 22,900

94 03144500 Muskingum River at 

Dresden

40°07′13′′ 81°59′59′′ 46,100 68,600 84,800 106,000 123,000 141,000 186,000 17 1

192

58,400 80,900 96,400 116,000 131,000 146,000 180,00046,800 69,800 86,200 108,000 125,000 142,000 184,000

95 03144800 Etna Creek at Etna 39°58′08′′ 82°40′55′′ 108 191 259 359 444 538 799 18 196

1

106 183 238 310 363 417 545107 189 252 339 409 482 667

96 03145500 Raccoon Creek at 

Granville

40°03′50′′ 82°31′35′′ 4,060 6,090 7,290 8,640 9,520 10,300 11,900 10 194

1

2,780 4,420 5,590 7,100 8,230 9,360 12,1003,910 5,830 6,950 8,260 9,180 10,100 11,900

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
97 03145600 Otter Fork near Centerburg 40°17′35′′ 82°43′09′′ 125 208 272 364 440 523 747 31 194

208 342 435 555 644 732 940131 222 294 398 482 571 797

98 03146000 North Fork Licking 

River at Utica

40°13′41′′ 82°27′06′′ 4,910 6,360 7,310 8,500 9,380 10,300 12,400 24 194

1956

197

3,400 5,300 6,640 8,360 9,640 10,900 13,9004,780 6,240 7,210 8,470 9,430 10,400 12,700

99 03146500 Licking River near 

Newark

40°03′33′′ 82°20′23′′ 11,800 17,800 22,100 27,700 32,100 36,700 48,000 62 194

10,400 15,600 19,200 23,800 27,300 30,800 39,000

11,800 17,700 21,900 27,400 31,700 36,100 46,900

100 03147000 Licking River at 

Toboso

40°03′26′′ 82°13′12′′ 12,800 20,100 25,200 31,800 36,700 41,700 53,300 45 190

1

192

12,400 18,500 22,800 28,300 32,400 36,500 46,20012,800 20,100 25,100 31,500 36,300 41,100 52,400

101 03147500 Licking River below 

Dillon Dam near Dillon Falls

39°59′18′′ 82°04′50′′ 13,900 24,200 32,300 43,900 53,400 63,700 90,800 22 1

194

14,600 22,300 27,700 34,700 40,000 45,300 57,70014,000 24,000 31,500 41,700 49,700 58,200 79,500

102 03147900 Timber Run near 

Zanesville

39°57′00′′ 82°03′07′′ 803 1,340 1,730 2,260 2,670 3,090 4,130 31 194

670 1,160 1,530 2,000 2,370 2,740 3,620790 1,320 1,690 2,200 2,590 2,990 3,970

103 03148300 Moxahala Creek at 

Roseville

39°48′38′′ 82°04′13′′ 2,350 3,390 4,150 5,200 6,050 6,960 9,340 25 196

2,270 3,450 4,260 5,300 6,060 6,820 8,6002,350 3,390 4,170 5,220 6,060 6,930 9,160

104 03149500 Salt Creek near Chandlersville 39°54′31′′ 81°51′38′′ 3,180 4,130 4,720 5,430 5,940 6,440 7,560 14 193

2

2,570 4,060 5,120 6,470 7,490 8,510 10,9003,100 4,120 4,810 5,710 6,390 7,080 8,660

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
105 03150000 Muskingum River at Mcconnelsville 39°38′42′′ 81°51′00′′ 55,800 85,800 107,000 135,000 156,000 178,000 232,000 17 1

192

66,600 91,200 108,000 130,000 146,000 162,000 199,000 56,500 86,300 107,000 134,000 154,000 175,000 224,000 106 03150600 Tupper Creek at Devola 39°28′24′′ 81°27′58′′ 139 224 292 391 475 569 828 15 196

118 214 286 381 454 527 704 134 221 290 387 466 549 764 107 03154500 Reedy Creek near Reedy, W. Va. 38°57′40′′ 81°23′25′′ 3,620 4,920 5,790 6,920 7,780 8,660 10,800 30 195

1997

2

2,600 4,060 5,080 6,390 7,370 8,350 10,600 3,560 4,840 5,710 6,850 7,720 8,600 10,800 108 03155500 Hughes River at Cisco, W. Va. 39°07′07′′ 81°16′39′′ 14,300 19,500 22,900 27,100 30,200 33,300 40,500 59 193

193

1

9,660 14,600 18,100 22,600 25,900 29,200 37,100 14,200 19,300 22,600 26,700 29,800 32,900 40,100 109 03157000 Clear Creek near 

Rockbridge

39°35′18′′ 82°34′43′′ 2,630 4,100 5,310 7,160 8,790 10,700 16,200 62 194

2,960 4,700 5,930 7,520 8,710 9,910 12,7002,640 4,130 5,360 7,200 8,780 10,600 15,600

110 03157500 Hocking River at 

Enterprise

39°33′54′′ 82°28′29′′ 7,010 10,900 14,100 19,000 23,300 28,300 42,800 71 1

193

9,360 14,100 17,400 21,600 24,800 27,900 35,3007,060 11,000 14,300 19,200 23,400 28,300 42,000

111 03158100 Hayden Run near Haydenville 39°28′57′′ 82°19′06′′ 83 149 207 298 381 477 765 12 196

133 247 335 452 541 633 855

91 173 246 355 447 547 811

112 03158220 Glen Run near Doanville 39°24′06′′ 82°11′44′′ 106 171 219 283 334 387 520 11 197

123 223 297 396 471 547 730109 184 244 326 390 457 619

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
113 03159450 Mill Creek near 

Chauncey

39°22′46′′ 82°05′04′′ 120 197 256 340 409 483 679 10 197

163 296 397 529 631 734 983128 223 302 414 504 598 830

114 03159500 Hocking River at 

Athens

39°19′44′′ 82°05′16′′ 12,200 17,700 22,000 28,200 33,300 39,000 54,500 90 1873

1907

191

15,400 22,600 27,600 33,900 38,600 43,400 54,40012,200 17,900 22,200 28,400 33,600 39,200 54,500

115 03159540 Shade River near 

Chester

39°03′49′′ 81°52′55′′ 3,540 5,080 6,290 8,050 9,550 11,200 15,900 36 196

4,130 6,300 7,810 9,730 11,200 12,600 15,9003,570 5,170 6,430 8,250 9,760 11,400 15,900

116 03159700 Grasslick Run near 

Ripley, W. Va.

38°45′53′′ 81°40′40′′ 149 243 321 442 549 672 1,030 13 196

96 180 244 329 395 462 625

137 224 293 393 476 566 807

117 03201440 Sixteenmile Creek 

near Pliny, W. Va.

38°38′39′′ 82°02′53′′ 298 474 617 831 1,020 1,220 1,820 13 196

131 242 327 439 526 614 828253 394 498 642 761 888 1,230

118 03201480 Threemile Creek Tributary near Pt. 

Pleasant, W. Va.

38°50′15′′ 82°05′42′′ 134 243 326 438 526 617 839 13 196

101 190 259 351 422 495 672126 227 301 399 476 555 749

119 03201550 Starr Run near New 

Plymouth

39°23′46′′ 82°20′49′′ 52 83 106 139 166 194 268 10 197

54 104 143 196 237 279 38153 90 121 166 201 238 331

120 03201600 Sandy Run above Big 

Four Hollow Creek near Lake Hope

39°21′45′′ 82°18′47′′ 109 269 446 783 1,140 1,610 3,340 11 197

129 241 327 441 530 620 840

113 260 397 607 789 994 1,590

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
121 03201700 Big Four Hollow Creek near Lake Hope 39°21′48′′ 82°18′51′′ 118 308 528 970 1,460 2,130 4,760 13 197

132 247 334 452 542 635 859 121 289 452 712 945 1,210 2,030 122 03202000 Raccoon Creek at Adamsville 38°51′32′′ 82°21′43′′ 6,090 8,990 11,100 14,100 16,500 19,100 25,900 78 191

1

193

199

9,820 14,100 17,000 20,700 23,400 26,100 32,300 6,150 9,120 11,300 14,400 16,900 19,500 26,300 123 03204500 Mud River near Milton, W. Va. 38°23′18′′ 82°06′48′′ 6,260 9,930 12,900 17,200 20,900 25,000 36,500 44 193

1

6,410 9,860 12,300 15,400 17,700 20,100 25,500 6,270 9,920 12,800 17,000 20,500 24,300 34,700 124 03205995 Sandusky Creek near Burlington 38°25′03′′ 82°30′36′′ 100 143 175 219 254 291 388 10 197

104 197 268 364 437 513 696 101 160 209 279 336 396 543 125 03207000 Twelvepole Creek at 

Wayne, W. Va.

38°13′05′′ 82°26′55′′ 6,470 10,100 12,800 16,400 19,300 22,300 30,000 32 191

192

1

194

6,840 10,500 13,000 16,300 18,700 21,200 26,9006,490 10,100 12,800 16,400 19,200 22,100 29,500

126 03216563 Mile Branch near 

Rush, Ky.

38°21′50′′ 82°47′45′′ 192 273 327 395 445 495 613 12 197

110 199 267 356 423 492 659

172 251 306 379 436 494 635

127 03217000 Tygarts Creek near 

Greenup, Ky.

38°33′51′′ 82°57′08′′ 7,090 11,600 15,200 20,300 24,700 29,400 42,500 62 1934

194

9,180 13,200 15,900 19,200 21,600 23,900 29,2007,140 11,700 15,200 20,300 24,400 28,900 40,900

128 03217500 Scioto River at Larue 40°34′28′′ 83°23′15′′ 5,300 7,960 9,640 11,600 13,000 14,300 17,200 25 1

192193

1

5,590 8,270 10,100 12,400 14,200 15,900 19,8005,310 7,990 9,690 11,700 13,200 14,600 17,600

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
129 03218000 Little Scioto River 

above Marion

40°37′43′′ 83°10′11′′ 1,090 1,710 2,200 2,900 3,500 4,140 5,920 38 193

1,560 2,300 2,780 3,360 3,760 4,150 5,0101,100 1,750 2,250 2,950 3,530 4,150 5,760

130 03219500 Scioto River near 

Prospect

40°25′10′′ 83°11′50′′ 6,000 8,100 9,400 10,900 12,000 13,100 15,400 88 1

191

9,420 13,500 16,200 19,600 22,200 24,700 30,5006,050 8,210 9,580 11,200 12,400 13,600 16,100

131 03219590 Bokes Creek near 

Warrensburg

40°19′20′′ 83°10′30′′ 2,010 2,990 3,640 4,460 5,070 5,660 7,030 16 198

2,500 3,850 4,780 5,960 6,840 7,710 9,7602,050 3,100 3,840 4,780 5,490 6,190 7,800

132 03220000 Mill Creek near Bellepoint 40°14′54′′ 83°10′26′′ 4,640 6,900 8,600 11,000 13,000 15,100 20,900 60 1

194

4,430 6,710 8,290 10,300 11,800 13,300 16,8004,630 6,890 8,580 11,000 12,900 15,000 20,400

133 03221000 Scioto River below 

O’Shaughnessy Dam near Dublin

40°08′36′′ 83°07′14′′ 12,900 19,600 24,500 31,300 36,700 42,500 57,400 81 1

192

14,200 20,200 24,200 29,200 33,000 36,700 45,20012,900 19,600 24,500 31,200 36,500 42,100 56,400

134 03223000 Olentangy River at 

Claridon

40°34′58′′ 82°59′20′′ 3,110 4,690 5,950 7,780 9,330 11,100 15,900 55 194

4,090 6,240 7,740 9,650 11,100 12,500 15,8003,130 4,760 6,050 7,910 9,480 11,200 15,900

135 03224000 Shaw Creek at Shawtown 40°29′00′′ 82°57′25′′ 807 1,120 1,340 1,650 1,890 2,150 2,830 10 194

1

1,160 1,900 2,420 3,090 3,590 4,090 5,280

840 1,220 1,520 1,940 2,270 2,620 3,490

136 03224500 Whetstone Creek near 

Ashley

40°27′18′′ 82°57′28′′ 2,810 4,210 5,320 6,980 8,390 9,990 14,500 20 195

3,130 4,950 6,230 7,890 9,130 10,400 13,3002,840 4,290 5,460 7,150 8,550 10,100 14,200

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
137 03225500 Olentangy River near Delaware 40°21′18′′ 83°04′02′′ 7,360 10,800 13,100 16,200 18,500 20,800 26,400 39 191

193

7,880 11,700 14,300 17,700 20,200 22,700 28,400 7,390 10,900 13,300 16,400 18,700 21,100 26,700 138 03226200 Delaware Run near Delaware 40°18′28′′ 83°06′35′′ 340 572 741 966 1,140 1,320 1,760 32 194

329 530 669 846 977 1,110 1,410 340 567 730 944 1,110 1,270 1,670 139 03226850 Linworth Run near Linworth 40°06′24′′ 83°02′35′′ 78 163 234 337 422 514 750 12 196

51 92 121 159 188 217 287 71 137 184 244 290 336 452 140 03228000 Scioto Big Run at Briggsdale 39°54′56′′ 83°03′55′′ 1,200 1,850 2,350 3,060 3,650 4,280 5,980 33 194

648 1,090 1,420 1,840 2,160 2,480 3,240 1,150 1,750 2,200 2,800 3,290 3,820 5,180 141 03228300 Big Walnut Creek at 

Sunbury

40°14′10′′ 82°51′05′′ 3,970 5,470 6,360 7,400 8,110 8,770 10,200 13 198

2,940 4,530 5,640 7,060 8,110 9,160 11,6003,810 5,270 6,180 7,290 8,110 8,910 10,700

142 03228500 Big Walnut Creek at 

Central College

40°06′13′′ 82°53′03′′ 7,030 10,500 12,900 16,000 18,300 20,600 26,200 17 193

1

5,210 8,150 10,200 12,900 15,000 17,000 21,8006,790 10,100 12,300 15,100 17,200 19,400 24,500

143 03228805 Alum Creek at Africa 40°10′56′′ 82°57′42′′ 4,360 5,670 6,410 7,240 7,800 8,310 9,350 11 196

4,000 6,410 8,140 10,400 12,100 13,800 17,8004,290 5,860 6,940 8,350 9,410 10,500 12,800

144 03229000 Alum Creek at 

Columbus

39°56′42′′ 82°56′28′′ 4,560 6,850 8,570 11,000 12,900 15,000 20,500 49 192

193

4,990 7,720 9,630 12,100 13,900 15,800 20,1004,570 6,900 8,640 11,100 13,000 15,100 20,400

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
145 03229500 Big Walnut Creek at 

Rees

39°51′24′′ 82°57′26′′ 12,000 17,400 21,000 25,500 28,800 32,100 39,700 32 1913

1

193

1

10,200 15,200 18,800 23,200 26,600 29,900 37,700

11,900 17,300 20,800 25,200 28,500 31,800 39,400

146 03230500 Big Darby Creek at 

Darbyville

39°42′02′′ 83°06′37′′ 8,380 13,100 16,800 22,100 26,500 31,300 44,300 79 192

193

10,300 15,300 18,700 23,200 26,500 29,800 37,500

8,410 13,200 16,900 22,100 26,500 31,200 43,700

147 03230600 Hominy Creek at Circleville 39°35′26′′ 82°55′25′′ 606 1,010 1,350 1,880 2,350 2,890 4,520 31 194

441 779 1,030 1,360 1,620 1,870 2,490593 981 1,300 1,770 2,180 2,630 3,910

148 03230800 Deer Creek at Mount 

Sterling

39°42′54′′ 83°15′26′′ 5,730 8,570 10,400 12,800 14,400 16,100 19,800 21 196

199

5,670 8,700 10,800 13,600 15,600 17,600 22,4005,720 8,590 10,500 12,900 14,700 16,400 20,500

149 03231000 Deer Creek at Williamsport 39°35′09′′ 83°07′22′′ 8,430 15,500 21,600 31,100 39,500 49,300 77,900 36 192

193

1

196

7,570 11,500 14,300 17,900 20,500 23,200 29,5008,400 15,200 20,900 29,400 36,600 44,700 67,600

150 03231500 Scioto River at Chillicothe 39°20′29′′ 82°58′16′′ 41,500 66,900 85,200 110,000 129,000 149,000 197,000 60 190

41,900 58,700 70,300 85,100 96,100 107,000 133,00041,500 66,600 84,500 108,000 126,000 145,000 191,000

151 03231600 East Fork Paint Creek 

near Sedalia

39°42′36′′ 83°27′48′′ 213 340 432 558 656 759 1,020 35 194

266 443 568 728 848 969 1,250217 349 449 584 690 799 1,070

152 03232000 Paint Creek near 

Greenfield

39°22′45′′ 83°22′32′′ 5,170 8,770 11,400 15,000 17,800 20,700 27,800 56 192

194195

199

6,050 9,210 11,400 14,200 16,400 18,500 23,4005,200 8,800 11,400 14,900 17,600 20,400 27,200

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
153 03232300 Rattlesnake Creek at Centerfield 39°19′44′′ 83°28′32′′ 5,170 7,140 8,320 9,670 10,600 11,500 13,300 10 197

5,350 8,210 10,200 12,800 14,700 16,600 21,100 5,190 7,360 8,790 10,600 11,900 13,200 16,100 154 03232500 Rocky Fork near Bar- retts Mills 39°13′06′′ 83°23′08′′ 6,380 9,350 11,400 14,000 16,000 18,000 22,800 12 194

4,160 6,550 8,250 10,400 12,100 13,700 17,600 5,950 8,610 10,400 12,600 14,300 16,100 20,300 155 03234000 Paint Creek near Bourneville 39°15′49′′ 83°10′01′′ 20,000 31,600 40,500 53,000 63,300 74,400 104,000 49 192

14,500 21,600 26,500 32,900 37,600 42,400 53,600 19,800 31,000 39,300 50,800 60,000 69,900 95,600 156 03234100 Indian Creek at Mass- ieville 39°15′42′′ 82°58′08′′ 1,380 2,510 3,510 5,110 6,580 8,310 13,600 32 194

1

661 1,160 1,530 2,010 2,380 2,760 3,670 1,320 2,330 3,170 4,430 5,510 6,750 10,300 157 03234500 Scioto River at Higby 39°12′44′′ 82°51′50′′ 47,700 77,300 100,000 133,000 161,000 191,000 271,000 43 1

193

53,100 74,400 89,100 108,000 122,000 136,000 168,00047,900 77,100 99,300 130,000 155,000 182,000 252,000

158 03235000 Salt Creek at Tarlton 39°33′20′′ 82°46′51′′ 996 1,600 2,070 2,770 3,350 4,000 5,790 31 194

727 1,250 1,630 2,130 2,510 2,900 3,820973 1,560 2,010 2,640 3,170 3,730 5,240

159 03235080 Bull Creek near 

Adelphi

39°27′11′′ 82°46′46′′ 348 660 928 1,340 1,700 2,120 3,310 11 197

282 504 670 888 1,050 1,220 1,630334 613 832 1,140 1,380 1,640 2,330

160 03235200 Little Blackjack 

Branch near South Bloomingville

39°27′23′′ 82°30′25′′ 174 356 507 727 909 1,110 1,610 17 196

120 227 308 417 501 587 796164 320 438 596 720 849 1,170

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
161 03235400 West Branch Tar 

Hollow Creek at Tar Hollow State Park

39°23′35′′ 82°45′12′′ 19 33 45 64 80 98 150 28 195

57 111 154 212 257 303 41722 41 60 89 115 143 218

162 03235500 Tar Hollow Creek at 

Tar Hollow State Park

39°23′22′′ 82°45′03′′ 109 213 307 462 607 780 1,320 32 194

172 325 443 602 726 852 1,160

114 224 326 488 632 797 1,270

163 03235995 Salt Creek near Londonderry 39°17′26′′ 82°44′45′′ 10,800 16,100 20,300 26,500 31,800 37,700 54,500 30 196

193

7,170 11,300 14,300 18,200 21,100 24,000 31,000

10,600 15,700 19,600 25,200 29,800 35,000 49,000

164 03236090 South Branch Little 

Salt Creek near Jackson

39°00′50′′ 82°39′01′′ 170 316 444 645 826 1,040 1,660 11 1

197

147 270 362 485 578 674 904165 302 412 570 699 838 1,210

165 03236100 South Branch Little 

Salt Creek at Jackson

39°02′38′′ 82°38′35′′ 660 886 1,030 1,190 1,310 1,420 1,680 31 194

313 551 726 956 1,130 1,310 1,730622 839 974 1,140 1,270 1,400 1,690

166 03237095 Devers Run at Lucasville 38°52′54′′ 83°01′13′′ 190 242 275 316 346 375 444 10 197

152 283 384 518 622 728 986180 255 316 401 469 538 704

167 03237210 Rose Run near Portsmouth 38°48′07′′ 82°59′03′′ 96 137 163 194 216 237 283 16 196

143 273 373 509 614 722 986103 161 207 272 323 374 491

168 03237280 Upper Twin Creek at 

Mcgaw

38°38′37′′ 83°12′57′′ 1,240 2,160 2,810 3,640 4,250 4,850 6,190 39 1

196

1,400 2,370 3,080 3,990 4,670 5,350 6,9601,250 2,180 2,840 3,690 4,310 4,930 6,330

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
169 03237300 West Branch Turkey Run near Win- chester 38°56′56′′ 83°40′19′′ 200 350 477 672 846 1,050 1,630 22 195

174 301 392 507 592 678 876 196 340 454 618 753 898 1,290 170 03237500 Ohio Brush Creek near West Union 38°48′13′′ 83°25′16′′ 20,700 30,600 38,100 48,600 57,200 66,500 91,200 70 192

194

14,700 21,800 26,500 32,500 36,900 41,200 51,100 20,500 30,100 37,300 47,100 55,000 63,400 85,500 171 03238030 Lawrence Creek near Maysville, Ky. 38°38′04′′ 83°47′32′′ 276 458 602 813 992 1,190 1,730 12 197

316 545 708 916 1,070 1,220 1,580 284 481 637 854 1,030 1,210 1,660 172 03238400 Harwood Creek near Fayetteville 39°07′50′′ 83°51′00′′ 133 221 286 375 445 519 701 12 196157 265 339 432 501 569 725 137 233 304 398 470 542 713 173 03238500 Whiteoak Creek near 

Georgetown

38°51′29′′ 83°55′43′′ 10,200 13,900 16,300 19,300 21,500 23,600 28,700 74 192

194

9,290 13,800 16,800 20,500 23,300 26,000 32,200

10,200 13,900 16,300 19,400 21,600 23,900 29,100

174 03239000 Little Miami River 

near Selma

39°48′36′′ 83°44′21′′ 1,390 2,930 4,270 6,300 8,060 10,000 15,400 25 195

1,940 3,130 3,980 5,080 5,910 6,740 8,7001,430 2,950 4,220 6,060 7,570 9,180 13,400

175 03239500 North Fork Little 

Miami River near Pitchin

39°49′40′′ 83°46′38′′ 379 842 1,310 2,150 2,980 4,040 7,630 25 195

1,110 1,750 2,190 2,750 3,170 3,580 4,560

409 910 1,410 2,240 3,020 3,940 6,750

176 03240000 Little Miami River 

near Oldtown

39°44′54′′ 83°55′53′′ 2,620 4,790 6,590 9,260 11,600 14,100 21,200 49 195

3,980 6,320 8,000 10,200 11,800 13,400 17,3002,660 4,870 6,680 9,340 11,600 14,000 20,600

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
177 03240500 North Fork Massie 

Creek at Cedarville

39°45′25′′ 83°47′25′′ 701 1,500 2,240 3,460 4,600 5,940 10,000 14 195

1,210 1,930 2,440 3,090 3,570 4,050 5,190

752 1,570 2,290 3,350 4,240 5,210 7,840

178 03241000 South Fork Massie 

Creek near Cedarville

39°44′20′′ 83°45′50′′ 718 1,370 1,960 2,890 3,740 4,750 7,780 14 195

816 1,310 1,660 2,110 2,450 2,780 3,560731 1,360 1,880 2,630 3,250 3,920 5,740

179 03241500 Massies Creek at Wilberforce 39°43′22′′ 83°52′58′′ 1,490 2,700 3,680 5,110 6,310 7,630 11,200 49 195

2,400 3,880 4,940 6,320 7,360 8,400 10,9001,520 2,760 3,760 5,220 6,430 7,730 11,200

180 03241600 Shawnee Creek at 

Xenia

39°40′32′′ 83°55′32′′ 383 675 873 1,120 1,290 1,460 1,820 30 194

327 566 740 966 1,140 1,310 1,720379 661 851 1,090 1,260 1,420 1,790

181 03242050 Little Miami River 

near Spring Valley

39°35′00′′ 84°01′49′′ 7,300 12,100 15,900 21,200 25,500 30,100 42,400 41 192

194

1

196

196

8,610 13,300 16,700 21,000 24,300 27,500 35,2007,340 12,200 15,900 21,100 25,300 29,800 41,400

182 03242100 Wayne Creek at 

Waynesville

39°31′08′′ 84°04′47′′ 258 448 596 806 980 1,170 1,660 16 196

126 233 313 421 503 587 790228 381 489 634 748 869 1,180

183 03242150 Caesar Creek near 

Xenia

39°37′25′′ 83°54′09′′ 3,060 3,980 4,550 5,240 5,730 6,200 7,260 15 196

2,490 3,970 5,020 6,370 7,380 8,400 10,8002,990 3,980 4,650 5,510 6,160 6,800 8,290

184 03242200 Anderson Fork near 

New Burlington

39°33′59′′ 83°54′10′′ 2,520 3,410 3,970 4,650 5,130 5,590 6,620 15 196

2,590 4,080 5,130 6,480 7,480 8,490 10,9002,530 3,510 4,190 5,060 5,720 6,360 7,830

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
185 03242300 Caesar Creek at Har- veysburg 39°30′27′′ 84°00′42′′ 6,990 11,200 14,700 20,300 25,300 31,200 48,900 16 1

196

5,930 9,370 11,800 15,000 17,400 19,800 25,500 6,910 11,000 14,300 19,200 23,500 28,200 41,700 186 03242500 Little Miami River near Fort Ancient 39°22′42′′ 84°05′32′′ 19,300 31,100 39,700 51,200 60,300 69,700 92,900 17 193

1

196

14,600 22,700 28,500 35,900 41,500 47,200 60,600 18,900 30,100 38,000 48,300 56,300 64,400 84,400 187 03244000 Todd Fork near Roachester 39°20′07′′ 84°05′12′′ 10,500 16,100 20,200 25,800 30,300 35,000 47,100 22 195

9,240 13,700 16,700 20,500 23,300 26,000 32,300 10,400 15,800 19,700 24,800 28,800 33,000 43,300 188 03245500 Little Miami River at Milford 39°10′17′′ 84°17′53′′ 30,500 44,000 53,400 65,800 75,300 85,200 110,000 54 1

191

192

32,700 46,700 56,100 67,800 76,400 84,800 104,000 30,600 44,100 53,600 65,900 75,400 85,100 109,000 189 03246500 East Fork Little Miami 

River at Williamsburg

39°03′09′′ 84°03′02′′ 10,700 14,400 16,800 19,600 21,700 23,700 28,200 21 195

1

196

2

9,300 13,500 16,300 19,800 22,300 24,800 30,500

10,600 14,300 16,700 19,600 21,800 23,900 28,700

190 03247100 Paterson Run near 

Owensville

39°07′38′′ 84°06′44′′ 583 721 799 886 944 997 1,110 31 194

424 695 881 1,110 1,290 1,460 1,850569 718 811 924 1,010 1,080 1,250

191 03247500 East Fork Little Miami 

River at Perintown

39°08′13′′ 84°14′17′′ 19,700 27,400 32,200 38,000 42,200 46,200 55,100 57 1913

1

192

197

16,500 24,000 29,100 35,400 40,000 44,500 54,90019,600 27,200 32,000 37,800 42,000 46,000 55,100

192 03248000 Little Miami River at 

Plainville

39°08′13′′ 84°21′11′′ 38,300 52,200 62,000 75,000 85,100 95,600 122,000 14 1

196

41,200 57,900 69,100 83,000 93,200 103,000 126,00038,500 53,000 63,200 76,700 87,000 97,600 123,000

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
193 03254400 North Fork Grassy 

Creek near Piner, Ky.

38°47′31′′ 84°30′50′′ 2,620 4,980 7,180 10,900 14,400 18,700 32,600 16 196

1,380 2,280 2,910 3,720 4,310 4,910 6,2902,420 4,340 5,870 8,080 9,950 12,100 18,100

194 03255500 Mill Creek at Reading 39°13′14′′ 84°26′49′′ 3,300 4,260 4,850 5,570 6,080 6,570 7,670 53 193

4,040 6,100 7,480 9,200 10,500 11,700 14,5003,330 4,350 5,030 5,870 6,480 7,070 8,410

195 03258000 West Fork Mill Creek 

at Lockland

39°13′35′′ 84°27′22′′ 3,520 5,010 5,940 7,040 7,820 8,550 10,200 14 193

2,620 4,150 5,200 6,530 7,510 8,480 10,7003,400 4,860 5,770 6,900 7,720 8,530 10,300

196 03260700 Bokengehalas Creek 

near De Graff

40°20′50′′ 83°53′28′′ 672 951 1,140 1,380 1,560 1,750 2,190 44 195

1,600 2,650 3,410 4,400 5,150 5,900 7,700

698 1,020 1,260 1,580 1,820 2,080 2,670

197 03260800 Stony Creek near De 

Graff

40°17′27′′ 83°54′36′′ 1,040 1,750 2,280 3,000 3,580 4,170 5,670 18 195

2,300 3,760 4,810 6,180 7,220 8,260 10,7001,120 1,940 2,600 3,520 4,250 5,000 6,830

198 03261500 Great Miami River at 

Sidney

40°17′13′′ 84°09′00′′ 6,830 10,700 13,600 17,800 21,200 25,000 35,000 89 191

8,760 12,500 15,000 18,200 20,500 22,800 28,2006,860 10,700 13,700 17,800 21,200 24,800 34,500

199 03262750 Millers Ditch at Tipp 

City

39°57′59′′ 84°10′22′′ 108 200 276 390 488 596 897 17 196

105 194 261 349 417 486 652108 199 272 376 460 549 781

200 03263100 Poplar Creek near 

Vandalia

39°52′10′′ 84°11′21′′ 400 658 851 1,120 1,330 1,560 2,130 31 194

282 504 669 887 1,050 1,220 1,630389 637 820 1,070 1,260 1,470 1,990

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
201 03263700 Bridge Creek near Greenville 40°04′13′′ 84°37′45′′ 350 550 673 816 912 1,000 1,180 31 194

346 589 765 992 1,160 1,340 1,750 350 554 686 846 959 1,070 1,300 202 03264000 Greenville Creek near Bradford 40°06′08′′ 84°25′48′′ 3,070 4,790 6,060 7,820 9,240 10,800 14,700 71 1

193

4,640 7,000 8,640 10,700 12,300 13,800 17,400 3,100 4,850 6,160 7,970 9,430 11,000 14,900 203 03265000 Stillwater River at Pleasant Hill 40°03′28′′ 84°21′22′′ 9,840 15,100 18,800 23,900 27,800 31,800 42,000 86 1

191

10,200 15,400 19,100 23,700 27,200 30,700 38,900 9,850 15,100 18,800 23,800 27,700 31,800 41,700 204 03265100 Hog Run tributary at Laura 40°00′30′′ 84°25′26′′ 36 61 80 106 127 150 207 28 195

58 102 134 176 207 239 313 38 66 89 121 146 173 238 205 03266500 Mad River at Zanesfield 40°21′01′′ 83°40′28′′ 409 725 989 1,390 1,730 2,120 3,230 33 194

463 783 1,020 1,320 1,540 1,770 2,320412 731 992 1,380 1,700 2,050 3,010

206 03267000 Mad River near 

Urbana

40°06′27′′ 83°47′57′′ 2,480 3,730 4,590 5,730 6,600 7,490 9,640 68 192

194

4,790 7,580 9,580 12,200 14,100 16,100 20,7002,520 3,830 4,780 6,040 7,010 8,000 10,400

207 03267900 Mad River at St. Paris 

Pike at Eagle City

39°57′51′′ 83°49′54′′ 5,360 7,130 8,190 9,410 10,300 11,000 12,700 34 1959

1

199

7,550 11,700 14,700 18,500 21,300 24,200 30,9005,450 7,410 8,680 10,300 11,400 12,500 14,900

208 03268000 Buck Creek at New 

Moorefield

39°59′31′′ 83°42′53′′ 1,840 2,520 3,060 3,830 4,490 5,220 7,240 17 194

2,460 3,990 5,100 6,530 7,610 8,700 11,3001,890 2,700 3,360 4,340 5,150 6,020 8,300

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
209 03268300 Beaver Creek at 

Brighton

39°55′46′′ 83°34′04′′ 253 469 631 851 1,020 1,200 1,620 19 195

248 419 541 698 817 936 1,220252 459 609 805 953 1,100 1,460

210 03268500 Beaver Creek near 

Springfield

39°56′26′′ 83°44′56′′ 1,850 2,870 3,590 4,540 5,280 6,030 7,870 21 194

197

1,490 2,370 3,000 3,800 4,390 4,990 6,4001,820 2,810 3,490 4,390 5,070 5,770 7,460

211 03269000 Buck Creek at Springfield 39°55′57′′ 83°49′02′′ 3,180 5,440 7,200 9,730 11,800 14,100 20,200 56 1

191192

195

4,280 6,820 8,650 11,000 12,800 14,600 18,8003,210 5,490 7,280 9,820 11,900 14,100 20,000

212 03269500 Mad River near 

Springfield

39°55′23′′ 83°52′13′′ 7,770 12,600 16,400 21,600 25,800 30,400 42,300 63 190

191

12,300 19,800 25,300 32,400 37,900 43,400 56,600

7,860 12,900 16,700 22,100 26,600 31,300 43,500

213 03270500 Great Miami River at 

Dayton

39°45′55′′ 84°11′51′′ 36,700 57,200 70,500 86,800 98,500 110,000 135,000 29 189

31,900 45,700 55,300 67,500 76,700 85,700 107,00036,600 56,600 69,500 85,100 96,300 107,000 131,000

214 03270800 Wolf Creek at Trotwood 39°47′39′′ 84°18′36′′ 1,570 2,410 2,960 3,650 4,160 4,670 5,810 25 1

196

1,800 2,840 3,550 4,440 5,100 5,740 7,2301,590 2,460 3,050 3,800 4,360 4,910 6,170

215 03271000 Wolf Creek at Dayton 39°46′00′′ 84°14′12′′ 4,370 6,460 7,940 9,920 11,500 13,100 17,100 28 193

1

198

4,200 6,530 8,120 10,100 11,600 13,100 16,4004,360 6,460 7,970 9,960 11,500 13,100 16,900

216 03271800 Twin Creek near 

Ingomar

39°42′28′′ 84°31′30′′ 7,580 10,900 13,400 17,000 20,100 23,400 32,600 38 1

196

8,960 13,500 16,500 20,300 23,100 25,900 32,3007,640 11,000 13,700 17,400 20,500 23,800 32,600

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
217 03272695 Trippetts Branch at Camden 39°38′03′′ 84°39′08′′ 100 179 236 313 373 433 578 10 197

90 164 218 287 340 392 516 97 173 228 300 355 410 540 218 03272700 Sevenmile Creek at Camden 39°37′45′′ 84°38′40′′ 3,200 5,260 6,960 9,520 11,800 14,300 21,500 31 197

4,270 6,640 8,270 10,300 11,800 13,300 16,800 3,260 5,380 7,110 9,640 11,800 14,100 20,400 219 03272800 Sevenmile Creek at Collinsville 39°31′23′′ 84°36′39′′ 6,130 9,760 12,500 16,300 19,300 22,600 31,100 17 1

196

6,250 9,540 11,800 14,600 16,700 18,800 23,500 6,140 9,730 12,400 15,900 18,700 21,500 28,700 220 03272900 Collins Creek at Col- linsville 39°31′05′′ 84°36′53′′ 241 351 420 502 559 614 730 17 196

202 361 477 627 739 852 1,120 234 353 436 542 622 700 879 221 03273500 Fourmile Creek near 

Hamilton

39°27′30′′ 84°32′50′′ 14,500 21,300 25,300 29,900 33,000 35,800 41,400 23 193

12,500 18,700 23,000 28,300 32,200 36,000 44,90014,400 21,000 25,000 29,600 32,800 35,800 42,100

222 03274000 Great Miami River at 

Hamilton

39°23′28′′ 84°34′20′′ 43,400 60,700 73,600 91,700 107,000 123,000 165,000 15 190

42,900 61,300 74,100 90,600 103,000 115,000 144,00043,400 60,700 73,700 91,500 106,000 121,000 160,000

223 03274100 Blake Run near Reily 39°27′59′′ 84°45′22′′ 61 111 149 202 244 287 395 36 193

194

194

76 134 177 231 271 311 40562 115 155 209 252 295 399

224 03274880 Greens Fork Tributary 

near Lynn, Ind.

40°01′14′′ 84°56′24′′ 95 167 222 299 360 426 592 10 197

156 270 350 453 529 605 781107 195 266 362 437 512 691

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
225 03275500 East Fork Whitewater 

River at Richmond, Ind.

39°48′24′′ 84°54′26′′ 5,250 8,850 11,600 15,400 18,400 21,600 29,900 30 1

195

5,790 8,660 10,600 13,000 14,800 16,500 20,5005,270 8,830 11,500 15,000 17,800 20,700 27,900

226 03275600 East Fork Whitewater 

River at Abington, Ind.

39°43′57′′ 84°57′35′′ 7,140 10,300 12,400 15,000 16,900 18,800 23,300 36 196

8,410 12,400 15,200 18,500 21,000 23,400 29,0007,190 10,400 12,600 15,300 17,400 19,400 24,100

227 03275800 West Run near Liberty, 

Ind.

39°38′24′′ 84°57′18′′ 73 130 176 244 302 365 539 17 197

83 150 199 262 309 357 46875 135 184 251 305 361 503

228 03275900 Templeton Creek near 

Fairfield, Ind.

39°31′20′′ 84°56′51′′ 387 790 1,150 1,740 2,270 2,890 4,750 10 197

623 1,020 1,290 1,630 1,890 2,140 2,710425 846 1,200 1,700 2,100 2,520 3,610

229 03276640 Tanners Creek Tributary near Lawrenceburg, Ind. 39°09′18′′ 84°52′20′′ 93 164 223 308 381 462 683 17 197

75 140 188 251 298 346 45989 158 211 285 344 406 565

230 03322500 Wabash River near 

New Corydon, Ind.

40°33′50′′ 84°48′10′′ 4,040 5,320 6,030 6,800 7,300 7,740 8,620 37 195

4,670 6,680 8,030 9,740 11,000 12,200 15,1004,050 5,380 6,150 7,010 7,600 8,130 9,220

231 03325500 Mississinewa River 

near Ridgeville, Ind.

40°16′48′′ 84°59′33′′ 3,910 5,910 7,300 9,120 10,500 11,900 15,400 55 194

3,640 5,590 6,950 8,700 9,990 11,300 14,3003,900 5,890 7,280 9,090 10,500 11,900 15,300

232 04096515 South Branch Hog 

Creek near Allen, Mich.

41°56′55′′ 84°49′40′′ 271 405 496 612 700 788 996 31 197

998 1,450 1,750 2,090 2,340 2,570 3,080288 442 556 707 821 935 1,200

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
233 04099060 Pigeon Creek. Tribu- tary near Ellis, Ind. 41°37′43′′ 84°54′56′′ 45 77 100 134 160 189 262 10 197

71 115 144 179 203 227 279 50 86 114 151 179 206 271 234 04176000 River Raisin near Adrian, Mich. 41°54′15′′ 83°58′50′′ 2,830 3,980 4,700 5,570 6,190 6,790 8,120 47 195

4,890 6,620 7,700 8,980 9,870 10,700 12,600 2,870 4,060 4,820 5,750 6,420 7,060 8,460 235 04176900 Hill Ditch near Rich- ards 41°39′54′′ 83°40′05′′ 81 161 230 334 425 527 812 35 194

138 212 259 314 353 391 472 84 166 234 331 410 495 717 236 04177400 Eagle Creek tributary near Montpelier 41°35′10′′ 84°40′50′′ 71 110 137 173 199 227 292 26 195

83 128 156 189 213 235 283 72 112 140 176 202 229 290 237 04177720 Fish Creek at 

Hamilton, Ind.

41°31′55′′ 84°54′12′′ 384 574 716 914 1,070 1,250 1,700 32 197

779 1,130 1,340 1,600 1,780 1,950 2,330396 601 759 976 1,150 1,330 1,790

238 04178000 St. Joseph River near 

Newville, Ind.

41°23′08′′ 84°48′06′′ 4,390 6,330 7,680 9,440 10,800 12,200 15,500 54 194

199

6,240 8,440 9,810 11,400 12,600 13,700 16,0004,420 6,400 7,770 9,550 10,900 12,300 15,600

239 04179500 Cedar Creek at 

Auburn, Ind.

41°21′57′′ 85°03′08′′ 882 1,170 1,350 1,570 1,730 1,890 2,250 39 194

198

1,670 2,430 2,930 3,510 3,930 4,320 5,190

905 1,220 1,430 1,700 1,900 2,100 2,540

240 04180000 Cedar Creek near 

Cedarville, Ind.

41°13′08′′ 85°04′35′′ 3,250 4,160 4,690 5,300 5,710 6,090 6,900 55 194

3,690 5,200 6,160 7,300 8,100 8,870 10,6003,260 4,200 4,760 5,410 5,860 6,290 7,180

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
241 04182590 Harber Ditch at Fort 

Wayne, Ind.

41°00′27′′ 85°10′58′′ 688 865 969 1,090 1,170 1,250 1,410 27 196

580 860 1,040 1,250 1,400 1,540 1,840680 865 977 1,110 1,210 1,300 1,500

242 04183500 Maumee River at 

Antwerp

41°11′56′′ 84°44′40′′ 14,000 18,200 20,900 24,400 26,900 29,500 35,600 71 191

16,300 21,500 24,800 28,700 31,400 34,000 39,60014,100 18,300 21,100 24,600 27,200 29,800 35,900

243 04183750 Racetrack Run at 

Hicksville

41°18′58′′ 84°46′00′′ 50 93 126 173 211 251 352 10 197

31 53 68 86 99 112 14044 77 98 123 142 161 207

244 04184500 Bean Creek at Powers 41°40′39′′ 84°13′56′′ 2,180 3,130 3,720 4,420 4,900 5,370 6,370 43 194

2

2,880 4,040 4,780 5,650 6,260 6,840 8,1202,200 3,170 3,780 4,500 5,020 5,500 6,550

245 04184750 Spring Creek at Fayette 41°40′32′′ 84°19′47′′ 268 325 356 389 411 430 469 10 197

148 244 309 389 446 502 626236 299 338 389 427 464 545

246 04184760 Bean Creek tributary 

near Fayette

41°39′08′′ 84°17′34′′ 58 73 81 91 98 105 119 10 197

43 71 90 114 130 147 182

54 72 85 101 113 125 150

247 04185000 Tiffin River at Stryker 41°30′16′′ 84°25′47′′ 3,480 4,930 5,820 6,860 7,580 8,260 9,710 70 1

192

1

194

5,010 6,970 8,220 9,710 10,800 11,800 13,9003,520 5,000 5,920 7,020 7,790 8,510 10,100

248 04185150 Beaver Creek tributary 

near Montpelier

41°34′19′′ 84°31′03′′ 96 125 143 164 179 194 225 10 197

33 55 71 89 102 115 14375 96 109 124 136 148 175

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
249 04185440 Unnamed Tributary to Lost Creek near Farmers 41°21′42′′ 84°41′28′′ 425 675 868 1,140 1,370 1,610 2,260 16 198

191 305 380 471 535 598 736 380 576 704 867 991 1,120 1,450 250 04185945 Auglaize River tribu- tary near Spencer- ville 40°42′27′′ 84°19′06′′ 87 135 168 210 241 272 344 10 197

44 76 97 123 142 160 201 73 110 133 162 182 203 251 251 04186500 Auglaize River near Fort Jennings 40°56′55′′ 84°15′58′′ 5,130 7,480 8,920 10,600 11,800 12,900 15,200 76 192

194

4,940 7,110 8,510 10,200 11,400 12,500 15,100 5,130 7,460 8,900 10,600 11,800 12,900 15,200 252 04186800 King Run near Harrod 40°43′56′′ 83°53′47′′ 94 125 145 167 183 199 232 21 196

48 84 108 139 161 183 232 86 116 135 158 176 193 232 253 04187100 Ottawa River at Lima 40°43′29′′ 84°07′35′′ 2,900 3,620 4,070 4,610 4,990 5,370 6,220 11 198

2,210 3,180 3,800 4,530 5,050 5,550 6,6302,800 3,540 4,000 4,580 5,010 5,430 6,370

254 04187500 Ottawa River at Allentown 40°45′18′′ 84°11′41′′ 3,110 4,470 5,310 6,290 6,970 7,620 8,990 52 192

1

194

2,610 3,730 4,450 5,300 5,900 6,470 7,7203,100 4,430 5,250 6,210 6,870 7,490 8,840

255 04187945 Rattlesnake Creek 

near Cairo

40°49′20′′ 84°04′16′′ 130 188 225 268 298 326 388 10 197

81 130 162 201 228 254 312

118 169 200 237 264 289 346

256 04188500 Eagle Creek near 

Findlay

40°59′35′′ 83°39′05′′ 2,100 2,870 3,350 3,900 4,280 4,650 5,430 13 194

195

1,350 2,060 2,530 3,090 3,490 3,870 4,7302,030 2,770 3,220 3,740 4,110 4,470 5,250

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
257 04189000 Blanchard River near 

Findlay

41°03′21′′ 83°41′17′′ 5,150 7,610 9,200 11,100 12,500 13,800 16,800 75 1

192

194

4,780 6,770 8,050 9,570 10,700 11,700 13,9005,140 7,580 9,130 11,000 12,300 13,600 16,500

258 04189100 Tiderishi Creek near 

Jenera

40°55′53′′ 83°43′39′′ 200 309 375 450 501 547 640 31 194

203 320 397 489 555 618 757200 310 378 457 511 562 666

259 04189500 Blanchard River at 

Glandorf

41°02′40′′ 84°04′55′′ 8,020 11,300 13,500 16,300 18,400 20,500 25,500 13 192

194

1

7,660 10,700 12,700 15,000 16,700 18,300 21,7008,000 11,200 13,400 16,000 18,000 20,000 24,600

260 04190350 Little Auglaize River 

tributary at Ottoville

40°55′05′′ 84°20′47′′ 53 80 97 117 131 144 173 10 197

63 100 124 153 173 193 23555 86 106 132 150 167 204

261 04190500 Roller Creek Atio City 40°46′16′′ 84°38′15′′ 211 310 378 466 534 603 771 31 194

217 340 421 517 586 652 796212 313 383 475 544 613 777

262 04191480 Beetree Run near 

Junction

41°13′21′′ 84°24′33′′ 95 132 154 180 198 214 249 11 197

88 139 172 212 240 266 32493 134 160 192 215 237 284

263 04191500 Auglaize River near 

Defiance

41°14′15′′ 84°23′57′′ 25,700 36,900 44,300 53,500 60,200 67,000 82,400 88 1

191

20,200 27,500 32,200 37,900 41,900 45,700 54,10025,600 36,600 43,700 52,500 58,900 65,300 79,800

264 04192500 Maumee River near 

Defiance

41°17′31′′ 84°16′52′′ 45,400 61,000 70,800 82,700 91,400 99,800 119,000 72 192

193

197

34,600 45,200 51,800 59,800 65,400 70,700 82,50045,200 60,400 69,900 81,300 89,500 97,500 116,000

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
265 04192900 Reitz Run at Water- ville 41°29′50′′ 83°42′35′′ 34 65 92 135 173 217 343 21 196

66 109 137 171 196 219 272 37 71 101 144 180 218 315 266 04193500 Maumee River at Waterville 41°30′00′′ 83°42′46′′ 51,700 69,900 82,300 98,200 110,000 123,000 153,000 81 190

1

192

193

38,000 49,200 56,300 64,800 70,800 76,600 89,100 51,400 69,200 81,000 96,100 108,000 119,000 147,000 267 04195500 Portage River at Woodville 41°26′58′′ 83°21′41′′ 6,440 8,700 10,100 11,700 12,800 13,800 16,100 70 1

192

194

5,670 8,040 9,560 11,400 12,700 13,900 16,600 6,430 8,680 10,100 11,700 12,800 13,800 16,100 268 04196000 Sandusky River near Bucyrus 40°48′13′′ 83°00′21′′ 2,600 3,920 4,890 6,230 7,310 8,460 11,500 49 192

193

1

196

1

199

1,790 2,640 3,190 3,850 4,320 4,760 5,750 2,570 3,850 4,760 6,000 6,970 7,990 10,600

269 04196500 Sandusky River near 

Upper Sandusky

40°51′02′′ 83°15′23′′ 4,770 6,760 8,000 9,480 10,500 11,500 13,700 60 192

193

2

4,550 6,600 7,920 9,530 10,700 11,800 14,2004,760 6,750 7,990 9,480 10,500 11,500 13,800

270 04196700 St. James River near 

Upper Sandusky

40°46′51′′ 83°18′12′′ 208 302 358 419 460 497 570 31 194

234 373 464 575 653 729 897210 309 371 443 493 540 636

271 04196800 Tymochtee Creek at 

Crawford

40°55′22′′ 83°20′56′′ 3,680 4,970 5,720 6,550 7,110 7,620 8,660 41 196

3,510 5,000 5,950 7,090 7,890 8,660 10,3003,680 4,970 5,730 6,610 7,200 7,740 8,880

272 04197000 Sandusky River near 

Mexico

41°02′39′′ 83°11′42′′ 8,700 12,200 14,500 17,200 19,100 20,900 25,000 60 192

193

9,220 13,100 15,500 18,500 20,700 22,700 27,2008,710 12,300 14,500 17,300 19,200 21,100 25,200

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
273 04197100 Honey Creek at Melmore 41°01′20′′ 83°06′35′′ 2,600 3,450 3,940 4,470 4,820 5,140 5,770 41 196

2,650 3,870 4,650 5,590 6,260 6,900 8,3102,600 3,480 3,990 4,580 4,970 5,340 6,090

274 04197170 Rock Creek at Tiffin 41°06′49′′ 83°10′06′′ 1,270 1,850 2,190 2,570 2,830 3,060 3,530 19 198

953 1,460 1,790 2,190 2,480 2,750 3,360

1,230 1,780 2,100 2,470 2,730 2,970 3,480

275 04197300 Wolf Creek at Bettsville 41°14′58′′ 83°14′08′′ 1,600 2,060 2,350 2,710 2,980 3,250 3,860 21 196

1,480 2,200 2,670 3,240 3,640 4,020 4,8701,590 2,070 2,400 2,810 3,110 3,410 4,100

276 04197400 East Branch Wolf 

Creek at Ft Seneca

41°12′40′′ 83°10′50′′ 1,760 2,220 2,500 2,840 3,080 3,310 3,830 15 196

1,590 2,400 2,920 3,550 4,000 4,430 5,3901,740 2,240 2,580 3,000 3,310 3,610 4,290

277 04197500 Havens Creek at 

Havens

41°17′36′′ 83°11′50′′ 139 207 249 299 333 365 434 31 194

176 274 336 411 464 515 626142 213 259 315 354 392 471

278 04198000 Sandusky River near 

Fremont

41°18′28′′ 83°09′32′′ 15,500 20,800 24,000 27,600 30,100 32,500 37,400 76 192

193

13,300 18,700 22,200 26,400 29,300 32,200 38,50015,400 20,700 23,900 27,600 30,100 32,400 37,500

279 04198100 Norwalk Creek near 

Norwalk

41°13′58′′ 82°32′28′′ 346 607 810 1,100 1,330 1,580 2,230 36 194

344 582 753 974 1,140 1,310 1,700346 605 803 1,080 1,290 1,520 2,100

280 04198500 East Branch Huron 

River near Norwalk

41°14′58′′ 82°38′52′′ 2,650 4,350 5,640 7,460 8,940 10,500 14,700 14 192

195

2,840 4,510 5,710 7,250 8,400 9,560 12,3002,670 4,370 5,650 7,410 8,820 10,300 14,000

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
281 04199000 Huron River at Milan 41°18′06′′ 82°36′25′′ 8,170 12,100 14,900 18,900 22,200 25,700 34,800 46 195

198

8,290 12,700 15,800 19,800 22,800 25,800 32,900 8,170 12,100 15,000 19,000 22,200 25,700 34,500 282 04199155 Old Womans Creek at Berlin Road near Huron 41°20′54′′ 82°30′50′′ 926 1,230 1,430 1,690 1,880 2,080 2,560 13 198

199

1,040 1,710 2,190 2,810 3,280 3,760 4,880 941 1,320 1,600 1,990 2,290 2,600 3,330 283 04199500 Vermilion River near Vermilion 41°22′55′′ 82°19′01′′ 5,770 8,800 11,200 14,700 17,600 20,900 30,100 33 195

2

5,770 8,660 10,700 13,200 15,100 17,000 21,400 5,770 8,790 11,100 14,500 17,300 20,300 28,500 284 04199800 Neff Run near Litch- field 41°12′33′′ 82°01′26′′ 71 97 115 138 156 175 220 17 196

80 140 183 238 280 322 421 72 105 130 165 193 221 289 285 04200000 East Branch Black 

River at Elyria

41°20′51′′ 82°05′40′′ 4,610 7,500 9,810 13,200 16,100 19,300 28,100 15 192

195

4,850 7,240 8,890 11,000 12,500 14,100 17,7004,620 7,470 9,680 12,800 15,300 18,100 25,300

286 04200100 Plum Creek at Oberlin 41°17′15′′ 82°13′12′′ 298 501 652 861 1,030 1,200 1,640 31 194

259 410 513 644 740 836 1,060296 492 634 823 970 1,120 1,500

287 04200500 Black River at Elyria 41°22′49′′ 82°06′17′′ 7,300 10,800 13,700 17,900 21,500 25,700 37,400 57 194

7,600 11,200 13,700 16,900 19,200 21,600 27,1007,310 10,900 13,700 17,800 21,400 25,300 36,300

288 04201500 Rocky River near 

Berea

41°24′24′′ 81°53′14′′ 8,110 11,100 13,000 15,500 17,300 19,100 23,300 70 192

194

5,660 8,440 10,400 12,800 14,700 16,500 20,7008,050 11,000 12,900 15,300 17,100 18,900 23,100

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
289 04202000 Cuyahoga River at 

Hiram Rapids

41°20′26′′ 81°10′01′′ 1,580 2,310 2,770 3,320 3,700 4,070 4,860 24 192

194

2,560 3,510 4,130 4,890 5,450 6,000 7,2501,610 2,360 2,850 3,440 3,860 4,250 5,120

290 04206212 North Fork at Bath 

Center

41°10′08′′ 81°38′04′′ 366 570 719 922 1,080 1,250 1,680 10 199

356 598 774 1,000 1,170 1,340 1,750364 578 738 953 1,120 1,290 1,710

291 04206220 Yellow Creek at 

Botzum

41°09′47′′ 81°35′02′′ 1,010 1,200 1,300 1,410 1,480 1,550 1,690 10 199

1,180 1,890 2,390 3,020 3,500 3,980 5,1101,040 1,330 1,550 1,850 2,070 2,290 2,770

292 04207200 Tinkers Creek at Bedford 41°23′04′′ 81°31′39′′ 2,750 3,890 4,730 5,880 6,810 7,800 10,400 39 196

1,770 2,510 2,990 3,590 4,030 4,460 5,4402,700 3,780 4,550 5,570 6,380 7,230 9,410

293 04208000 Cuyahoga River at 

Independence

41°23′43′′ 81°37′48′′ 8,850 11,700 13,600 16,000 17,800 19,600 24,100 73 192

192

194

9,670 13,500 16,100 19,400 21,800 24,200 29,7008,860 11,700 13,600 16,100 18,000 19,900 24,400

294 04209000 Chagrin River at Willoughby 41°37′51′′ 81°24′13′′ 8,850 13,500 17,000 22,100 26,300 31,000 43,600 66 1

192194198

199

5,070 7,510 9,210 11,400 13,000 14,500 18,2008,750 13,200 16,600 21,300 25,200 29,500 40,800

295 04210000 Phelps Creek near 

Windsor

41°30′56′′ 80°56′07′′ 1,860 2,690 3,190 3,770 4,160 4,510 5,260 18 194

804 1,210 1,480 1,820 2,070 2,320 2,900

1,760 2,480 2,880 3,320 3,630 3,930 4,580

296 04210090 Montville Ditch at 

Montville

41°36′04′′ 81°03′03′′ 28 54 76 107 132 160 233 12 196

39 70 92 121 143 165 21830 59 81 113 137 163 225

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
297 04210100 Hoskins Creek at Hartsgrove 41°36′00′′ 80°57′12′′ 201 324 419 553 663 783 1,100 36 194

198

219 329 402 493 559 624 774 202 324 417 547 651 762 1,050 298 04211000 Rock Creek near Rock Creek 41°39′05′′ 80°50′10′′ 2,510 3,670 4,420 5,340 6,010 6,670 8,160 25 194

1,240 1,670 1,940 2,270 2,510 2,740 3,270 2,440 3,480 4,110 4,860 5,390 5,910 7,090 299 04211500 Mill Creek near Jef- ferson 41°45′11′′ 80°48′03′′ 3,320 4,600 5,510 6,740 7,720 8,750 11,400 33 1941,670 2,360 2,810 3,370 3,780 4,180 5,110 3,250 4,440 5,270 6,350 7,200 8,080 10,300 300 04212000 Grand River near Madison 41°44′26′′ 81°02′48′′ 8,780 11,600 13,300 15,500 17,100 18,700 22,300 51 192

193

6,200 7,980 9,130 10,600 11,600 12,600 14,900 8,720 11,400 13,100 15,200 16,700 18,200 21,600 301 04212100 Grand River near 

Painesville

41°43′08′′ 81°13′41′′ 12,700 15,700 17,300 19,100 20,200 21,300 23,300 27 197

7,540 9,880 11,400 13,300 14,700 16,100 19,200

12,500 15,300 16,800 18,400 19,500 20,500 22,700

302 04212500 Ashtabula River near 

Ashtabula

41°51′20′′ 80°45′44′′ 4,440 6,400 7,720 9,430 10,700 12,000 15,200 54 192

193195

199

2,350 3,330 3,990 4,800 5,400 5,990 7,3604,390 6,270 7,510 9,090 10,300 11,500 14,300

303 04212600 Hubbard Run tributary at Ashtabula 41°50′38′′ 80°46′42′′ 105 143 170 206 235 264 341 17 196

81 138 180 233 273 313 409

101 142 172 213 246 280 364

304 04213000 Conneaut Creek at 

Conneaut

41°55′37′′ 80°36′15′′ 6,130 8,950 10,800 13,200 14,900 16,600 20,500 66 192

195

3,880 5,730 7,000 8,600 9,790 11,000 13,7006,060 8,820 10,600 12,800 14,500 16,100 19,800

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estiregression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
305 04213040 Raccoon Creek near 

West Springfield, Pa.

41°56′42′′ 80°26′51′′ 131 219 284 374 445 520 708 35 196

171 283 362 463 538 613 791133 223 292 385 459 535 723

Table 5. Flood-frequency data for streamflow-gaging stations—Continued[Bold station numbers indicate peak streamflows at this station presently (2003) are considered regulated. For each station, the upper numbers are the log-Pearson Type III estim

regression estimates, and the lower numbers are weighted estimates. Streamflow-gaging stations are in Ohio unless indicated otherwise. Abbreviations: ft3/s, cubic feet per sec

Map

ID

(fig. 1)

Station

number Station name Latitude Longitude

Flood-peak discharge (ft3/s) for indicated recurrence interval, in years Record 

2 5 10 25 50 100 500 Years P

u
56 A Streamflow Statistics (StreamStats) Web Application for Ohio

APPENDIXES

A.Statistical Techniques for Determining Confidence Intervals and Testing for Extrapolation

B. Basin Characteristics used as Regressor Variables
Appendix A—Statistical Techniques for Determining Confidence Intervals and Testing for Extrapolation 57

Appendix A—Statistical Techniques for 

Determining Confidence Intervals and Testing for 

Extrapolation

The linear model relating basin characteristics to t-year peak 

flows can be written in matrix form as:

Y=XB

where

Y is a column vector of logarithms of the n observed 

peak discharges,

X is a (n by p) matrix of consisting of p-1 basin characteristics augmented by a column of ones in the first 

column, and

B is a column vector of p regression coefficients.

For example, the matrix form of the simple equation for the 2-

year peak discharge (Q2) is

where

Q2,i is the observed 2-year peak discharge for the ith gage 

site;

DAi is the drainage area for the ith site;

R1i equals 1 if site is in region C, otherwise 0; and

R2i equals 1 if site is in region A, otherwise 0.

The mean square sampling error for an ungaged site 

(MSEs,0) with basin characteristics given by the row vector

,

is calculated as

, (1A)

where is the (n by n) covariance matrix associated with Y. 

The off-diagonal elements of are the sample covariance of 

the estimated t-year peaks at sites i and j. The diagonal elements 

of are the sums of model error variance, , and the timesampling error for each site. Appendix tables 7 and 8 list the (p

by p) matrices for the simple- and full-model 

equations, respectively, and appendix table 9 lists the model 

error variances for both models. The mean square error of a prediction (MSEp), in base-10 logarithmic units, at a specific 

ungaged site can be estimated as

. (2A)

With MSEp,0 known, the standard error of prediction, in percent, can be calculated as

. (3A)

Confidence limits for a predicted peak discharge, , can 

be calculated as

 and , (4A)

where and are the upper and lower confidence limits, 

respectively, for the prediction, and

, (5A)

where

is Student’s t with a specified alpha ( ) level 

and n-p degrees of freedom.

The applicability of the regression equations presented 

in this report is unknown when the basin-characteristic values 

associated with an ungaged site are outside a space defined by 

the basin characteristics of the calibration data set. This space, 

called a regressor variable hull (RVH), contains as many dimensions as there are regressor (explanatory) variables in the 

regression equation (Montgomery and Peck, 1982). When 

points defined by the basin characteristics of the ungaged site lie 

within or on the boundary of the RVH, then the estimation generally can be determined by interpolation. If the point lies outside of the RVH, then estimation will require extrapolation, 

which may lead to poor performance of the regression equation. 

Tests for extrapolation can be performed by comparing 

the basin-characteristic values of the ungaged site to the ranges 

of values observed in the calibration data set for the appropriate 

region (table 2, in the body of this report). In addition, one can 

test for extrapolation by computing the mean-square sampling 

error for the ungaged site (MSEs,0), as described earlier in the 

appendix, and comparing it to the maximum mean-square sampling error (appendix table 9) of the calibration data set for the 

appropriate model and recurrence interval. If one or more basin 

characteristic values lies outside of the range of values of the 

Q2 1, log( )

Q2 2, log( )

""

Q2 305 , log( )

1 DA1 log( ) R11 R21

1 DA2 log( ) R12 R22

"" "" "" ""

1 DA305 log( ) R1305 R2305

1.84

0.72

0.44

0.19

=

x0 1 DA0 log( ) R10 R20 =

MSEs, 0 x0 XTΛ–1 { } X –1x0

T =

Λ

Λ

Λ γ

2

XTΛ–1 { } X –1

MSEp, 0 γ

2 MSEs, 0 = ( ) +

SEprediction 100 e

5.302 MSEp, 0 ( ) – 1

⎩ ⎭ ⎨ ⎬ ⎧ ⎫

1

2

--

=

yˆ

yu

ˆ = Cyˆ yuˆ 1

C = ---yˆ

yˆ

u yˆl

C 10

tα

2

---, n p – MSEp, 0 ( )

1

2

--

=

t

α

2

---, n p –

α
58 A Streamflow Statistics (StreamStats) Web Application for Ohio

Table 7. Matrix for the simple equations in table 4

[Numbers are in scientific notation. Order of variables in matrix 

is constant, DA, R1, R2]

2-year recurrence interval

1.16710E-03 -2.31670E-04 -5.30300E-04 -5.01710E-04

-2.31670E-04 1.03160E-04 1.74400E-05 1.30820E-05

-5.30300E-04 1.74400E-05 1.71270E-03 5.12540E-04

-5.01710E-04 1.30820E-05 5.12540E-04 6.56310E-04

5-year recurrence interval

1.17960E-03 -2.34730E-04 -5.33260E-04 -4.88860E-04

-2.34730E-04 1.04780E-04 1.63510E-05 9.40110E-06

-5.33260E-04 1.63510E-05 1.78330E-03 5.24120E-04

-4.88860E-04 9.40110E-06 5.24120E-04 6.71170E-04

10-year recurrence interval

1.28500E-03 -2.55830E-04 -5.82840E-04 -5.24160E-04

-2.55830E-04 1.13710E-04 1.79100E-05 9.04120E-06

-5.82840E-04 1.79100E-05 1.97620E-03 5.74110E-04

-5.24160E-04 9.04120E-06 5.74110E-04 7.32470E-04

25-year recurrence interval

1.46910E-03 -2.92510E-04 -6.69420E-04 -5.91950E-04

-2.92510E-04 1.29290E-04 2.08500E-05 9.67320E-06

-6.69420E-04 2.08500E-05 2.29640E-03 6.59040E-04

-5.91950E-04 9.67320E-06 6.59040E-04 8.37500E-04

50-year recurrence interval

1.62750E-03 -3.24120E-04 -7.44240E-04 -6.52590E-04

-3.24120E-04 1.42860E-04 2.34350E-05 1.05400E-05

-7.44240E-04 2.34350E-05 2.56860E-03 7.31950E-04

-6.52590E-04 1.05400E-05 7.31950E-04 9.28360E-04

100-year recurrence interval

1.79710E-03 -3.58020E-04 -8.24900E-04 -7.18950E-04

-3.58020E-04 1.57550E-04 2.62470E-05 1.15790E-05

-8.24900E-04 2.62470E-05 2.86010E-03 8.10390E-04

-7.18950E-04 1.15790E-05 8.10390E-04 1.02670E-03

500-year recurrence interval

2.22320E-03 -4.43540E-04 -1.03090E-03 -8.90890E-04

-4.43540E-04 1.95290E-04 3.35310E-05 1.43470E-05

-1.03090E-03 3.35310E-05 3.59990E-03 1.01060E-03

-8.90890E-04 1.43470E-05 1.01060E-03 1.28010E-03

XTΛ–1 { } X –1
Appendix A—Statistical Techniques for Determining Confidence Intervals and Testing for Extrapolation 59

Table 8. Matrix for the full-model equations in table 3

[Numbers are in scientific notation. Order of variables in matrix is the constant, DA, R1, R2, 

SL10-85, W]

2-year recurrence interval

5.43490E-03 -1.21280E-03 1.35390E-04 2.95600E-05 -2.55660E-03 -7.09400E-04

-1.21280E-03 3.43990E-04 -1.64750E-04 -1.11530E-04 6.23090E-04 6.50510E-06

1.35390E-04 -1.64750E-04 1.69680E-03 5.51590E-04 -4.27650E-04 1.93550E-04

2.95600E-05 -1.11530E-04 5.51590E-04 6.44850E-04 -3.03770E-04 2.45230E-05

-2.55660E-03 6.23090E-04 -4.27650E-04 -3.03770E-04 1.56490E-03 1.50660E-04

-7.09400E-04 6.50510E-06 1.93550E-04 2.45230E-05 1.50660E-04 1.24330E-03

5-year recurrence interval

5.00650E-03 -1.11020E-03 1.26980E-04 2.88540E-05 -2.35920E-03 -6.46450E-04

-1.11020E-03 3.15560E-04 -1.53760E-04 -1.02710E-04 5.73210E-04 -1.44920E-06

1.26980E-04 -1.53760E-04 1.65110E-03 5.22430E-04 -4.05020E-04 1.75010E-04

2.88540E-05 -1.02710E-04 5.22430E-04 6.10640E-04 -2.78100E-04 1.60280E-05

-2.35920E-03 5.73210E-04 -4.05020E-04 -2.78100E-04 1.46640E-03 1.25790E-04

-6.46450E-04 -1.44920E-06 1.75010E-04 1.60280E-05 1.25790E-04 1.18860E-03

10-year recurrence interval

5.22920E-03 -1.15310E-03 1.18930E-04 1.71590E-05 -2.46010E-03 -6.66980E-04

-1.15310E-03 3.27530E-04 -1.58620E-04 -1.04110E-04 5.95330E-04 -6.92150E-06

1.18930E-04 -1.58620E-04 1.78740E-03 5.54770E-04 -4.23080E-04 1.82480E-04

1.71590E-05 -1.04110E-04 5.54770E-04 6.47310E-04 -2.83670E-04 1.50820E-05

-2.46010E-03 5.95330E-04 -4.23080E-04 -2.83670E-04 1.53810E-03 1.21370E-04

-6.66980E-04 -6.92150E-06 1.82480E-04 1.50820E-05 1.21370E-04 1.26450E-03

25-year recurrence interval

5.80040E-03 -1.27200E-03 1.12240E-04 1.19220E-06 -2.72190E-03 -7.30500E-04

-1.27200E-03 3.61090E-04 -1.73050E-04 -1.11500E-04 6.56030E-04 -1.38440E-05

1.12240E-04 -1.73050E-04 2.05360E-03 6.25590E-04 -4.67110E-04 2.03450E-04

1.19220E-06 -1.11500E-04 6.25590E-04 7.28820E-04 -3.06680E-04 1.63900E-05

-2.72190E-03 6.56030E-04 -4.67110E-04 -3.06680E-04 1.70910E-03 1.23790E-04

-7.30500E-04 -1.38440E-05 2.03450E-04 1.63900E-05 1.23790E-04 1.42710E-03

XTΛ–1 { } X –1
60 A Streamflow Statistics (StreamStats) Web Application for Ohio

50-year recurrence interval

6.35750E-03 -1.39030E-03 1.10720E-04 -9.62360E-06 -2.97990E-03 -7.95230E-04

-1.39030E-03 3.94670E-04 -1.87980E-04 -1.19940E-04 7.16680E-04 -1.89980E-05

1.10720E-04 -1.87980E-04 2.29440E-03 6.92140E-04 -5.10660E-04 2.24210E-04

-9.62360E-06 -1.19940E-04 6.92140E-04 8.05960E-04 -3.31890E-04 1.81740E-05

-2.97990E-03 7.16680E-04 -5.10660E-04 -3.31890E-04 1.87490E-03 1.29540E-04

-7.95230E-04 -1.89980E-05 2.24210E-04 1.81740E-05 1.29540E-04 1.57940E-03

100-year recurrence interval

6.99390E-03 -1.52680E-03 1.12260E-04 -1.90370E-05 -3.27710E-03 -8.70490E-04

-1.52680E-03 4.33500E-04 -2.05610E-04 -1.30320E-04 7.86960E-04 -2.41680E-05

1.12260E-04 -2.05610E-04 2.56100E-03 7.67050E-04 -5.61250E-04 2.48060E-04

-1.90370E-05 -1.30320E-04 7.67050E-04 8.93180E-04 -3.62280E-04 2.02510E-05

-3.27710E-03 7.86960E-04 -5.61250E-04 -3.62280E-04 2.06490E-03 1.37810E-04

-8.70490E-04 -2.41680E-05 2.48060E-04 2.02510E-05 1.37810E-04 1.75130E-03

500-year recurrence interval

8.71250E-03 -1.89890E-03 1.26980E-04 -3.53530E-05 -4.09030E-03 -1.07690E-03

-1.89890E-03 5.39830E-04 -2.55190E-04 -1.60550E-04 9.80360E-04 -3.65050E-05

1.26980E-04 -2.55190E-04 3.26020E-03 9.66720E-04 -7.01460E-04 3.12890E-04

-3.53530E-05 -1.60550E-04 9.66720E-04 1.12710E-03 -4.49070E-04 2.54990E-05

-4.09030E-03 9.80360E-04 -7.01460E-04 -4.49070E-04 2.58310E-03 1.64610E-04

-1.07690E-03 -3.65050E-05 3.12890E-04 2.54990E-05 1.64610E-04 2.21160E-03

Table 9. Model error variances and maximum mean-square sampling errors for 

regression models

Recurrence 

interval

(years)

Model error variance ( ) 

for indicated model

Maximum mean-square

 sampling error (MSEs) for indicated model

Simple Full Simple Full

2 0.02684 0.02329 0.00211 0.00234

5 .02590 .02045 .00222 .00229

10 .02664 .02023 .00242 .00246

25 .02854 .02114 .00280 .00280

50 .03047 .02241 .00312 .00310

100 .03272 .02407 .00346 .00343

500 .03906 .02910 .00433 .00431

Table 8. Matrix for the full-model equations in table 3—Continued

[Numbers are in scientific notation. Order of variables in matrix is the constant, DA, R1, R2, 

SL10-85, W]

XT

Λ–1 { } X –1

γ

2
References 61

calibration data set, or if the mean-square sampling error for the 

ungaged site is larger than the maximum mean square sampling 

error of the calibration data set, then the estimate is an extrapolation.

References

Montgomery, D.C., and Peck, E.A., 1982, Introduction to linear 

regression analysis: New York, Wiley, 504 p.
62 A Streamflow Statistics (StreamStats) Web Application for Ohio

Appendix B—Basin Characteristics used as 

Regressor Variables

DA, drainage area (square miles)—the area, measured 

from a USGS 7.5 minute topographic map, in a horizontal 

plane, that is contained within the topographic divide for a specified location on a stream. Although the regression models were 

developed using manually-determined map-based drainage area 

as an explanatory variable, StreamStats uses a specially processed digital elevation model to determine drainage areas. 

StreamStats will compute drainage areas that are comparable to 

map-based determinations in most cases; however, limitations 

associated with DEM resolution and/or scale, as well as other 

possible factors, may result in erroneous drainage area determinations. It is the user’s responsibility to verify that the drainage 

boundaries (and consequently the drainage area) derived by 

StreamStats are correct.

SL10-85, channel slope (feet per mile)—computed by (a) 

determining the longest flowpath from the point of interest to a 

topographic divide (which generally corresponded to the basin 

divide), (b) determining the elevation at 10 percent of the distance along the longest flowpath upstream from the point at 

which the flow statistic is desired (E10), (c) determining the elevation at 85 percent of the distance along the longest flowpath 

upstream from the point at which the flow statistic is desired 

(E85), (d) determining the length of the stream segment between 

points 10- and 85-percent of the distance along the longest flowpath upstream from the point at which the flow statistic is 

desired (L10-85), and then (e) dividing the change in elevation 

(E85 - E10) by L10-85.

W, percentage of the basin classified as open water and 

wetlands1 (percent)—determined by (1) summing the areas of 

the 1992 National Land Cover Dataset (NLCD) grid cells (U.S. 

Geological Survey, 2000) contained within the basin boundary 

that are classified as open water, woody wetlands, or emergent 

herbaceous wetlands (land-cover class codes 11, 91, and 92, 

respectively), (2) dividing by the area of the basin, and then (3) 

multiplying by 100.

References

U.S. Geological Survey, 2000, National Land Cover Dataset 

(version 03-16-2000): U.S. Geological Survey, accessed 

on June 3, 2006, at http://landcover.usgs.gov/natllandcover.php

1

The 1992 NLCD data reflect land cover characteristics during 

the early 1990’s. Some of the gaging stations whose data were used in 

this study are located on streams that are presently regulated. In many 

cases, the regulation resulted from completion of one or more in-channel reservoirs. To better reflect land cover conditions during the 

unregulated period associated with the data used in this analysis, 

water areas used to compute W were reduced by the surface areas of 

in-channel reservoirs whose construction resulted in the regulated designation for streamflow at a gaging station, as well as all upstream inchannel reservoirs built thereafter.