Prepared in cooperation with the National Park Service

Water-Quality and Flow Data, Chulitna River Basin, 

Southwest Alaska, October 2009–June 2012

U.S. Department of the Interior

U.S. Geological Survey

Open-File Report 2013–1009
Cover: Chulitna River at U.S. Geological Survey gaging station 15298040. (Photograph 

taken by Charles Couvillion, U.S. Geological Survey, May 26, 2010.)
Water-Quality and Flow Data, Chulitna River Basin, 

Southwest Alaska, October 2009–June 2012

By Timothy P. Brabets

Prepared in cooperation with the National Park Service

Open File Report 2013–1009

U.S. Department of the Interior

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

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2013

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as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.

Suggested citation:

Brabets, T.P., 2013, Water-quality and flow data, Chulitna River basin, Southwest Alaska, October 2009–June 2012: 

U.S. Geological Survey Open-File Report 2013–1009, 30 p.
iii

Contents

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

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

Purpose and Scope ..............................................................................................................................4

Description of Study Area ............................................................................................................................4

Water-Quality Data........................................................................................................................................5

Water-Quality Samples ........................................................................................................................5

Continuous-Records of Dissolved Oxygen, pH, Specific Conductance, Turbidity, and Water 

Temperature.............................................................................................................................5

Flow Data.........................................................................................................................................................5

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

References Cited............................................................................................................................................6

Figures

1. Map showing location of Lake Clark National Park and Preserve and the

Chulitna River basin, southwest Alaska................................................... 2

2. Digital elevation map showing Lake Clark and Chulitna River basins and major

river basins, southwest Alaska ............................................................ 3

3. Map showing locations of sampling sites, Chulitna River basin, southwest 

Alaska ....................................................................................... 4
iv

Tables

1. Description of data-collection sites, Chulitna River basin, southwest Alaska ...... 8

2. Analyses of water samples collected at USGS streamflow-gaging station

15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska,

March 2010–June 2012 ..................................................................... 8

3. Summary of standard analytical methods and associated references used in

this study .................................................................................... 9

4. Physical field parameters measured at surface-water sites in the Chulitna

River basin, Alaska, March 2010–June 2012 ............................................. 10

5. Concentrations of major ions in water samples collected at USGS

streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near

Port Alsworth, Alaska, March 2010–June 2012 .......................................... 11

6. Dissolved trace-element concentrations in water samples collected at USGS

streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near

Port Alsworth, Alaska, March 2010–June 2012 .......................................... 12

7. Concentrations of nutrients, dissolved organic carbon, and suspended

sediment in water samples collected at USGS streamflow-gaging station

15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska,

March 2010–June 2012. .................................................................. 13

8. Results from a blank sample collected at USGS streamflow-gaging station

15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska,

August 18, 2010 .............................................................................. 13

9. Results from a replicate sample collected at USGS streamflow-gaging station

15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska,

March 9, 2011 .............................................................................. 14

10. Water temperature data for USGS streamflow-gaging station 15298040,

Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, water years

2010 and 2011................................................................................. 15

11. Dissolved oxygen data for USGS streamflow-gaging station 15298040,

Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, water years

2010 and 2011................................................................................. 21

12. pH data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles

above mouth, near Port Alsworth, Alaska, water years 2010 and 2011 ............... 23

13. Specific conductance data for USGS streamflow-gaging station 15298040,

Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, water years

2010 and 2011................................................................................. 25

14. Turbidity data for USGS streamflow-gaging station 15298040, Chulitna River 5

miles above mouth, near Port Alsworth, Alaska, water years 2010 and 2011 ...... 27

15. Discharge data for USGS streamflow-gaging station 15298040, Chulitna River

5 miles above mouth, near Point Alsworth, Alaska, water years 2010 and 2011 ... 29
v

Conversion Factors, Datums, and Abbreviations and 

Acronyms

Conversion Factors

Multiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)

inch (in.) 25.4 millimeter (mm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Weight

ounce (oz) 28.35 gram (g)

pound (lb) 0.4536 kilogram (kg)

Area

square mile (mi2) 259.0 hectare (ha)

square mile (mi2) 2.590 square kilometer (km2) 

Flow rate

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

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F=(1.8 ×°C)+32.

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (μS/cm at 

25 °C).

Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) 

or micrograms per liter (μg/L).

Datums

Vertical coordinate information is referenced to the North American Vertical Datum of 1929 

(NAVD 29).

Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27).

Altitude, as used in this report, refers to distance above the vertical datum.

Abbreviations and Acronyms

FNU formazin Nephelometric units

LACL Lake Clark National Park and Preserve

NFM U.S. Geological Survey, National Field Manual

NWIS U.S. Geological Survey, National Water Information System

USGS U.S. Geological Survey
vi

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Water-Quality and Flow Data, Chulitna River Basin, 

Southwest Alaska, October 2009–June 2012

By Timothy P. Brabets

Abstract 

The Chulitna River basin in southwest Alaska drains an 

area of about 1,160 square miles, with the lower 158 square 

miles of the basin in Lake Clark National Park and Preserve. 

Water from this basin influences Lake Clark ecosystems 

that support salmon that, in part, sustain the Bristol Bay 

fishery. An area of about 391 square milesin the upper part 

of the Chulitna River basin has been staked for mining 

development (1,670 claims), and a proposed large scale 

copper-gold-molybdenum mine (Pebble Mine) lies adjacent 

to the Chulitna River drainage. The U.S. Geological Survey 

in cooperation with the National Park Service conducted 

a water-quality assessment of the Chulitna River from 

October 2009 to June 2012. Discrete water-quality samples 

and continuous-records of dissolved oxygen, pH, specific 

conductance, turbidity, water-stage, and water temperature 

data were collected from the Chulitna River. In addition, four 

miscellaneous sites were visited five times during 2010–12 to 

measure flow and water-quality parameters.

Introduction

The Chulitna River basin in southwest Alaska is part of 

the Lake Clark basin in Lake Clark National Park and Preserve 

(LACL), Alaska (figs. 1–2). The basin supports a variety 

of aquatic and terrestrial life that depends on high-quality 

aquatic ecosystems. Fish and wildlife from this area support 

subsistence harvests by residents of the local communities of 

Iliamna, Newhalen, Port Alsworth, and Nondalton (Morris, 

1986; Fall and others, 1996; Krieg and others, 2005). Fish 

species present within the basin include northern pike, Arctic 

grayling and char, burbot, longnose suckers, humpback and 

round whitefish, least cisco, nine-spine stickleback, slimy 

sculpin, sockeye salmon, occasional Chinook salmon, and 

Dolly Varden (Russell, 1980). The Chulitna River provides 

the only known spawning habitat for humpback whitefish 

and least cisco in the Lake Clark basin (Woody and Young, 

2007). Humpback whitefish are the second most important fish 

harvested by subsistence users in the region after salmon (Fall 

and others, 1996; Krieg and others, 2005). Terrestrial wildlife 

within the drainage include grizzly bear, moose, caribou, 

and beaver.

The legislative purpose of LACL mandates that the park 

“....protect the watershed necessary for perpetuation of the 

red salmon fishery; ... and maintain unimpaired...wild rivers, 

lakes, waterfalls...in their natural state” (Alaska National 

Interest Lands Conservation Act, 1980). The number-one 

natural resource priority for the park is to collect information 

needed to protect aquatic resources critical for the freshwater 

part of the salmon life cycle, including baseline information 

on water-quality and basic habitat characteristics.

Potential mining activity in the region poses a possible 

threat to the water quality and fisheries habitat in the Chulitna 

River basin. An area of about 391 mi2 in the upper part of 

Chulitna River basin (fig. 3) has been staked for mining 

development (1,670 claims), and a proposed large scale 

copper-gold-molybdenum mine (Pebble Mine) lies adjacent 

to the Chulitna River drainage (fig. 1). Owners of the Pebble 

Mine are proceeding with a program of core drilling and 

environmental sampling, with plans to submit applications 

for permits by 2013 and to start mining operations several 

years later. The Pebble Mine deposit is currently estimated 

at 80.6 billion pounds (lb) of copper, 107.4 million ounces 

(oz) of gold, and 5.6 billion pounds (lb) of molybdenum 

(Pebble Partnership, 2012), and has an estimated value 

ranging from $300 to $500 billion (American Association 

for the Advancement of Science, 2011). To date, the Pebble 

Partnership has spent more than $100 million to support 

development of the deposit (Pebble Partnership, 2012). If 

permitted, the Pebble Mine may include the largest open-pit 

mine in North America, an underground mine, a 700-ft-high 

tailings dam, a tailings pond, a mill, a 100-mi transportation 

corridor with a road and slurry pipeline, a port facility on 

Cook Inlet, and extensive support facilities (Chambers, 2007; 

Hauser, 2007; Moran, 2007). 
2 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

tac12-5201_fig01

50 100 MILES

0 50 100 KILOMETERS

0

62 ̊

58 ̊

60 ̊

158 ̊ 156 ̊ 154 ̊ 152 ̊

Chulitna

River

Pebble Mine

Kvichak River

Bristol Bay

Newhalen River

Chigmit Mountains

Cook Inlet

Lake Clark

Iliamna 

Lake

Anchorage

Neocola Mountains

Location

ALASKA

LAKE CLARK 

NATIONAL PARK 

AND PRESERVE

Port

Alsworth

Nondalton

Iliamna

Newhalen

Kuskokwim

River Basin

Nushagak

River Basin

Lake Clark

Watershed

Cook

Inlet

Basin

Base from U.S. Geological Survey digital data, 1: 63,360, 1957

Albers Equal-Area Conic projection, Standard parallels 55 ̊00' and 65 ̊00', 

central meridian -154 ̊00'

Kvichak River Basin

Figure 1. Location of Lake Clark National Park and Preserve and the Chulitna River basin, southwest Alaska.
Introduction 

3 tac12-5201_fig02

0

0

5

5 10

10 15 20 25 MILES

15 20 25 KILOMETERS

153 ̊ 156 ̊ 155 ̊ 154 ̊

61 ̊

60 ̊

30'

60 ̊

Tlikakila River Basin

Chokotonk River Basin

Currant Creek Basin

Tanalian River Basin

Kijik River Basin

Chulitna River Basin

Lake Clark

EXPLANATION

Port 

Alsworth

Base from U.S. Geological Survey digital data, 1: 63,360, 1957Albers Equal-Area Conic projection, Standard parallels 55 ̊00' and 65 ̊00', central meridian -154 ̊00'

LittleLake Clark

Tlikakila River

Basin boundaryElevation

HighestLowest

Figure 2. Lake Clark and Chulitna River basins and major river basins, southwest Alaska.
4 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Although mining currently (2012) is not taking place 

in the Chulitna River basin, the National Park Service 

still is responsible for ensuring that waters entering Lake 

Clark National Park and Preserve remain at a quality level 

that supports native species. The scale and location of the 

proposed mining claims could pose a threat to the water 

quality and fish habitat of the Chulitna River basin and 

downstream ecosystems because the Chulitna River provides 

between 20 and 30 percent of the total inflow to Lake Clark 

(Brabets, 2002).

Purpose and Scope

This report contains water-quality and flow data collected 

by the U.S. Geological Survey (USGS) from October 2009 

to June 2012 at USGS gaging station 15298040, and at four 

miscellaneous sites in the Chulitna River basin (fig. 3 and 

table 1). Water-quality data consist of discrete water samples 

collected at various times during the hydrologic year at 

USGS streamgage 15298040, and continuous water-quality 

monitoring of dissolved oxygen, pH, specific conductance, 

turbidity, and water temperature at the gaging station. Field 

parameters were collected at four additional miscellaneous 

sites. Flow data consist of periodic streamflow measurements 

and continuous streamflow monitoring. All data are stored in 

the USGS National Water Information System (NWIS).

Description of Study Area

Lake Clark National Park and Preserve is in south-central 

and southwest Alaska (fig. 1). The park is about 6,300 mi2

in area and straddles several river basins. About one-third of 

the park is in the Cook Inlet basin of south-central Alaska 

(fig. 1). Streams and rivers in this section of the park flow 

east into Cook Inlet. The remaining two-thirds of the park 

tac12-5201_fig03

0 10 MILES

0 10 KILOMETERS

60o

30'

154o

 30'

60o

20'

60o

10'

155o

 30'

60o

156o 155o

USGS streamgage

Miscellaneous site

5

2

EXPLANATION

Base from U.S. Geological Survey digital data, 1: 63,360, 1957

Albers Equal-Area Conic projection, Standard parallels 55 ̊00' and 65 ̊00', 

central meridian -154 ̊00'

Area with 1,670 mining claims 

LAKE CLARK 

NATIONAL PARK

AND PRESERVE

5

2

3 4

1

Figure 3. Locations of sampling sites, Chulitna River basin, southwest Alaska.
Flow Data 5

are in the Kvichak, Kuskokwim, and Nushagak River basins 

of southwest Alaska. Streams and rivers in the Kvichak and 

Nushagak River basins flow southwest, eventually entering 

Bristol Bay. For sockeye salmon (Oncorhynchus nerka), the 

Kvichak River basin is one of the most productive basins in 

Alaska. Each year, an estimated 1.5 to 6 million sockeye enter 

the Lake Clark basin through the Newhalen River to spawn in 

the many streams in the park.

The Lake Clark basin (fig. 2) drains 2,940 mi2 . In 

addition to six major rivers that flow into Lake Clark, there are 

numerous small glacier-fed streams originating in the Chigmit 

and Neocola Mountains and clearwater streams originating 

in the foothills and lowlands that flow into Lake Clark. The 

Chulitna River basin is 1,160 mi2 in area (at the mouth), and is 

the largest basin in the Lake Clark basin. Mean basin slope is 

7 percent, mean annual precipitation is 26 in., average altitude 

is 1,080 ft, no glaciers are present, and lakes occupy an area of 

35.5 mi2 of the basin (Brabets, 2002). Mesozoic sedimentary 

rock is the major rock type, and the major soils are spodosols, 

histosols, and andisols. Low and tall shrubs are the major 

vegetation. A previous study by Brabets (2002) indicates 

that the Chulitna River provides 20–30 percent of the inflow 

to Lake Clark.

Water-Quality Data

The following sections describe water sample-collection 

techniques, analytical methods, and flow collection techniques 

used at the sampling location on the Chulitna River. A 

summary of site characteristics (latitude, longitude, drainage 

area, and altitude) is provided in table 1, and the site locations 

are shown in figure 3. All data discussed in this section also 

are available from the U.S. Geological Survey (2012). 

Water-Quality Samples

Water-quality samples were collected at various times 

at the USGS streamgage. Samples collected in March 2010, 

2011, and 2012 were collected through the river ice. The 

final sample was collected in June 2012. In total, 12 samples 

were collected. A broad range of constituents were measured, 

including field parameters, major ions, dissolved trace 

elements, nutrients, and suspended sediment (table 2).

Water-quality collection and processing procedures 

followed USGS National Field Manual (NFM) protocols (U.S. 

Geological Survey, variously dated). A two-person minimum 

field team collected samples to reduce the opportunity for 

contamination of low-concentration analytes, following the 

protocols of Horowitz and others (1994) and Shelton (1994). 

Sampling and processing equipment was cleaned prior to each 

field trip following USGS NFM procedures. 

The USGS National Water-Quality Laboratory in Denver, 

Colorado, analyzed all discrete water samples for dissolved 

and whole-water constituents using standard USGS methods 

and quality-assurance practices (Fishman and Friedman, 1989; 

Patton and Truitt, 1992; Fishman, 1993; Garbarino and others, 

2006). A summary of the standard analytical methods used and 

associated references is provided in table 3. Analytical results 

are presented in tables 4–7.

The four miscellaneous sites were visited a total of five 

times during the data-collection period. Sites were visited in 

March 2010, 2011, and 2012, a low-flow, ice-covered period, 

and twice in the summer (July 2010 and August 2011) during 

average flow or above average flow conditions. At the time 

of each visit, a discharge measurement was made and water 

-quality field parameters were measured—dissolved oxygen, 

pH, specific conductance, turbidity, and water temperature. 

Data for these sites are presented in table 4.

During the data-collection period, quality-assurance and 

quality-control protocols were used. A sample containing 

blank water was collected with the August 18, 2010 sample, 

and a replicate sample was collected with the March 9, 2011 

sample. Results from these 2010 and 2011samples are given in 

tables 8 and 9, respectively. 

Continuous-Records of Dissolved Oxygen, pH, 

Specific Conductance, Turbidity, and Water 

Temperature

At the USGS streamgage 15298040, a Yellow Springs 

Instrument Model 6920 sonde was installed during the 

open-water season in water years 2010 and 2011 to collect 

continuous dissolved oxygen, pH, specific conductance, 

turbidity, and water temperature data. Data were collected 

every 15 minutes. This period generally lasted from late May 

to the end of September. Water temperature also was collected 

from the stage sensor; therefore, these data are available for 

the entire water year. Water- quality data were compiled using 

methods outlined in Wagner and others (2006) and are shown 

in tables 10–14.

Flow Data

A sensor was installed in October 2009 at the 

streamgage to collect continuous stage data. Using methods 

outlined by Turnispeed and Sauer (2010), a number of 

discharge measurements were made over a range of flows. A 

stage‐discharge relation was then developed to compute daily 

discharge at the streamgage. Discharge data for water years 

2010 and 2011 are shown in table 15.
6 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Acknowledgments

This study was funded by the National Park Service/U.S. 

Geological Survey Water-Quality Partnership Program. 

Special thanks go to Dan Young of LACL at Port Alsworth 

who arranged housing for USGS personnel during sampling 

trips, boats to access the Chulitna River gaging station, and the 

use of the park plane to access the miscellaneous sites. 

References Cited

Alaska National Interest Lands Conservation Act, 1980, 16 

U.S.C 3101 et seq. (1988), December 2, 1980, Stat. 2371, 

Pub. L. 96–487.

American Association for the Advancement of Science, 

2011, Proposed Pebble Mine has Alaskan community 

focused on critical science and policy issues: American 

Association for the Advancement of Science news release, 

accessed October 22, 2012, at http://www.aaas.org/news/

releases/2011/1018arctic_div_pebble.shtml.

Brabets, T.P., 2002, Water quality of the Tlikakila River and 

five major tributaries to Lake Clark, Lake Clark National 

Park and Preserve, Alaska 1999–2001: U.S. Geological 

Survey Water-Resources Investigations Report 2002–4127, 

29 p. (Also available at http://pubs.er.usgs.gov/publication/

wri024127.)

Brenton, R.W., and Arnett, T.L., 1993, Methods of analysis 

by the U.S. Geological Survey National Water Quality 

Laboratory–Determination of dissolved organic carbon 

by UV-promoted persulfate of oxidation and infrared 

spectrometry: U.S. Geological Survey Open-File Report 

92–480, 12 p. (Also available at http://pubs.er.usgs.gov/

publication/ofr92480.)

Chambers, D.M., 2007, Pebble engineering geology—

Discussion of issues: Center for Science in Public 

Participation, accessed October 22, 2012, at http://

fish4thefuture.com/pdfs/Pebble%20Engineering%20

Geology%20-%20Chambers%20Sep07.pdf.

Fall, J.A., Chythlook, M.B., Schichnes, J.C., and Morris, J.M., 

1996, An overview of the harvest and use of freshwater fish 

by the communities of the Bristol Bay region, southwest 

Alaska: Alaska Department of Fish and Game, Division 

of Subsistence, Technical Paper Series, Technical Paper 

No. 166, 171 p.

Fishman, M.J., ed., 1993, Methods of analysis by the U.S. 

Geological Survey National Water-Quality Laboratory—

Determination of inorganic and organic constituents in 

water and fluvial sediments: U.S. Geological Survey OpenFile Report 93–125, 217 p. (Also available at http://pubs.

er.usgs.gov/publication/ofr93125.)

Fishman, M.J., and Friedman, L.C., eds., 1989, Method for 

determination of inorganic substances in water and fluvial 

sediments: U.S. Geological Survey Techniques of WaterResources Investigations, book 5, chap. A1, 545 p. (Also 

available at http://pubs.er.usgs.gov/publication/twri05A1.)

Fishman, M.J., Raese, J.W., Gerlitz, C. N., and Husband, 

R.A., 1994, U.S. Geological Survey approved inorganic 

and organic methods for the analysis of water and fluvial 

sediment, 1954–94: U.S. Geological Survey Open-File 

Report 94–351, 55 p. (Also available at http://pubs.er.usgs.

gov/publication/ofr94351.)

Garbarino, J.R., Kanagy, L.K., and Cree, M.E., 2006, 

Determination of elements in natural-water, biota, sediment 

and soil samples using collision-reaction cell inductively 

coupled plasma-mass spectrometry: U.S. Geological 

Survey Techniques and Methods, book 5, sec. B, chap. 1, 

87 p. (Also available at http://pubs.er.usgs.gov/publication/

tm5B1.)

Guy, H.P., 1969, Laboratory theory and methods for sediment 

analysis: U.S. Geological Survey Techniques of WaterResources Investigations, book 5, chapter C1, 58 p.

Hauser, W.J., 2007, Potential impacts of the proposed 

Pebble Mine on fish habitat and fishery resources of 

Bristol Bay: Fisheries Research and Consulting web site, 

accessed October 22, 2012, at http://fish4thefuture.com/

pdfs/Pebble%20Fish%20Habitat%20Report%20-%20

Hauser%20Sep%2007.pdf.

Horowitz, A.J., Demas, C.R., Fitzgerald, K.K., Miller, T.L., 

and Rickert, D.A., 1994, U.S. Geological Survey protocol 

for the collection and processing of surface-water samples 

for the subsequent determination of inorganic constituents 

in filtered water: U.S. Geological Survey Open-File report 

94-539, 57 p. (Also available at http://pubs.er.usgs.gov/

publication/ofr94539.)

Krieg, T., Chythlook, M.B., Coiley-Kenner, P., Holen, D., 

Kamletz, K., and Nicholson, H., 2005, Freshwater fish 

harvest and use in communities of the Kvichak watershed: 

Juneau, Alaska, Alaska Department of Fish and Game, 

Division of Subsistence, Technical Paper 297.

Moran, R.E., 2007, Pebble hydrogeology and geochemistry 

issues: Fisheries Research and Consulting web site accessed 

October 22, 2012, at http://fish4thefuture.com/pdfs/Moran_

Hydrogeology_Geochemistry_8_9_07.pdf.

Morris, J.M., 1986, Subsistence production and exchange in 

the Iliamna Lake region, southwest Alaska, 1982–1983: 

Juneau, Alaska, Alaska Department of Fish and Game, 

Division of Subsistence, Technical Paper No. 136, 187 p.
References Cited 7

Patton, C.J., and Truitt, E.P., 1992, Methods of analysis 

by the U.S. Geological Survey National Water Quality 

Laboratory—Determination of total phosphorus by a 

Kjeldahl digestion method and an automated colorimetric 

finish that includes dialysis: U.S. Geological Survey OpenFile Report 92–146, 39 p. (Also available at http://pubs.

er.usgs.gov/publication/ofr92146.)

Patton, C.J., and Truitt, E.P., 2000, Methods of analysis 

by the U.S. Geological Survey National Water Quality 

Laboratory—Determination of ammonium plus organic 

nitrogen by a Kjeldahl digestion method and an automated 

photometric finish that includes digest cleanup by gas 

diffusion: U.S. Geological Survey Open-File Report 

2000-170, 31 p. (Also available at http://pubs.er.usgs.gov/

publication/ofr00170.)

Pebble Partnership, 2012, Prospecting the future: Pebble 

Partnership web site accessed October 22, 2012, at http://

www.pebblepartnership.com/project.php.

Russell, R., 1980, A fisheries inventory of waters in the Lake 

Clark National Monument area: Alaska Department of Fish 

and Game, 124 p.

Shelton, L.R., 1994, Field guide for collecting and processing 

stream-water samples for the National Water-Quality 

Assessment Program: U.S. Geological Survey Open-File 

Report 94–455, 42 p. (Also available at http://pubs.er.usgs.

gov/publication/ofr94455.)

Turnipseed, D.P., and Sauer, V.B., 2010, Discharge 

measurements at gaging stations—U.S. Geological Survey 

Techniques and Methods, book 3, chap. A8, 87 p. (Also 

available at http://pubs.er.usgs.gov/publication/tm3A8.) 

U.S. Geological Survey, variously dated, National field manual 

for the collection of water-quality data: U.S. Geological 

Survey Techniques of Water-Resources Investigations, 

book 9, chaps. A1-A9. (Also available at http://pubs.er.usgs.

gov/publication/twri09.)

U.S. Geological Survey, 2012, USGS water data for Alaska: 

U.S. Geological Survey National Water Information System 

web interface, accessed September 14, 2012, at http://

waterdata.usgs.gov/ak/nwis/.

Wagner, R.J., Boulger, R.W., Oblinger, C.J., and Smith, B.A., 

2006, Guidelines and standard procedures for continuous 

water-quality monitors—Station operation, record 

computation, and data reporting: U.S. Geological Survey 

Techniques and Methods, book 1, chap. D3, 51 p. (also 

available at http://pubs.er.usgs.gov/publication/tm1D3.)

Woody, C.A., and Young, D.Y., 2007, Life history and 

essential habitats of humpback whitefish in Lake Clark 

National Park, Kvichak River watershed, Alaska: 

Anchorage, U.S. Fish and Wildlife Service Office of 

Subsistence Management, Annual Report for Study 

FIS 05-403.
8 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Table 1. Description of data-collection sites, Chulitna River basin, southwest Alaska.

[Site No.: Location of Site No. is shown in figure 3. Abbreviations: USGS, U.S. Geological Survey; mi2, square mile]

Site

No. USGS No. Latitude/ longitude Station name Area(mi2) Remarks

1 600524155254200 60o

05'24" 155o25'42" Chulitna River 0.4 mile above Nikabuna Lake, near Nondalton 335 Miscellaneous site

2 600610154570100 60o

06'10" 154o57'01" Hoknede Lake Creek 0.4 mile below Hoknede Lake, near Nondalton 15.3 Miscellaneous site

3 601049154540600 60o

10'49" 154o54'06" Koksetna River 0.1 mile above mouth, near Nondalton 375 Miscellaneous site

4 601050154544400 60o

10'50" 154o54'44" Chulitna River 0.3 mile above Koksetna River, near Nondalton 664 Miscellaneous site

5 15298040 60o

12'16" 154o42'08" Chulitna River 5 miles above mouth, near Port Alsworth 1,120 Continuous site

Water-quality parameter Reporting 

level Units

Field measurements of water

Water temperature 0.5 °C

Specific conductance 1 μS/cm

pH 0.1 unit

Dissolved oxygen 0.1 mg/L

Turbidity 0.1 FNU

Streamflow 0.1 ft3/s

Major ions (mg/L)

Alkalinity 8

Bicarbonate 1

Calcium 0.044

Chloride 0.08

Dissolved solids 10

Fluoride 0.08

Magnesium 0.016

Potassium 0.064

Silica 0.058

Sodium 0.10

Sulfate 0.18

Trace elements (μg/L)

Aluminum 3.4

Antimony 0.402

Arsenic 0.044

Barium 0.14

Beryllium 0.012

Boron 2.8

Cadmium 0.02

Chromium 0.12

Table 2. Analyses of water samples collected at USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near 

Port Alsworth, Alaska, March 2010–June 2012.

[Abbreviations: °C, degrees Celsius; μS/cm, microsiemens per centimeter at 25 degrees Celsius; mg/L, milligram per liter; FNU, Formazin nephelometric unit; 

ft3/s, cubic foot per second; μg/L, microgram per liter; mm, millimeter]

Water-quality parameter Reporting 

level Units

Trace elements (μg/L)—Continued

Cobalt 0.1090

Copper 1.0

Iron 6

Lead 0.030

Lithium 0.44

Manganese 0.2272

Molybdenum 0.028

Nickel 0.12

Selenium 0.04

Silver 0.010

Strontium 0.40

Thallium 0.02

Uranium 0.008

Vanadium 0.16

Zinc 2.8

Suspended sediment in water (mg/L)

Concentration 1

Percent finer than 0.062 mm 1

Nutrients in water (mg/L)

Nitrogen, ammonia, dissolved 0.02

Nitrogen, ammonia+organic, dissolved 0.10

Nitrogen, ammonia+organic, total 0.10

Nitrogen, nitrite+nitrate, dissolved 0.016

Nitrogen, nitrite, dissolved 0.002

Phosphorus, dissolved 0.006

Orthophosphorus, dissolved 0.008

Phosphorus, total 0.008

Dissolved organic carbon 0.66
Tables 9

Table 3. Summary of standard analytical methods and associated references used in this study.

[Abbreviations: Dis, dissolved; fet, fixed end-point; tot, total; IT, incremental titration; mm, millimeter]

Water-quality parameter Reference Analytical method

Solids, residue, dissolved Fishman and others (1994) Gravimetric, residue on evaporation at 180oC

Turbidity Fishman and Friedman (1989) Nephelometry

Oxygen, dissolved U.S. Geological Survey (1997–99) Amperometric

pH, whole water U.S. Geological Survey (1997–99) Electrometric electrode

Specific conductance U.S. Geological Survey (1997–99) Wheatstone Bridge

Major ions

Calcium, dissolved Fishman (1993) Inductively Coupled Plasma–Atomic Emission Spectrometry

Magnesium, dissolved Fishman (1993) Inductively Coupled Plasma–Atomic Emission Spectrometry

Potassium, dissolved Fishman and Friedman (1989) Flame atomic absorption

Sodium, dissolved Fishman (1993) Inductively Coupled Plasma–Atomic Emission Spectrometry

Alkalinity, Dis fet lab, as CaCO3 U.S. Geological Survey (1997–99) Dissolved fixed end point titration

Alkalinity, Dis tot IT, field U.S. Geological Survey (1997–99) Dissolved incremental end point titration

Bicarbonate Dis IT, field U.S. Geological Survey (1997–99) Calculated

Chloride, dissolved Fishman and Friedman (1989) Ion chromatography

Fluoride, dissolved Fishman and Friedman (1989) Automated segmented flow-ion-selective electrode

Silica, dissolved Fishman (1993) Inductively Coupled Plasma–Atomic Emission Spectrometry

Sulfate, dissolved Fishman and Friedman (1989) Ion chromatography

Nutrients

Nitrogen, ammonia, dissolved Fishman (1993) Colorimetry, automated segmented flow–salicylate-hypochlorite

Nitrogen, ammonia+organic, dissolved Patton and Truitt (2000) Colorimetry, automated segmented flow–Microkjeldahl digestion

Nitrogen, ammonia+organic, total Fishman and others (1994) Colorimetry, block digestor salicylate-hypochlorite

Nitrogen, nitrite+nitrate, dissolved Fishman (1993) Colorimetry, automated segmented flow–cadmium reduction-diazotization

Nitrogen, nitrate, dissolved Fishman and Friedman (1989) Ion chromatography

Phosphorus, dissolved Patton and Truitt (1992) Colorimetry, automated segmented flow–Microkjeldahl digestion

Orthophosphorus Fishman (1993) Colorimetry, automated segmented flow–phosphomolybdate

Phosphorus, total Patton and Truitt (1992) Colorimetry, automated segmented flow–Microkjeldahl digestion

Carbon, organic, dissolved (DOC) Brenton and Arnett (1993) Wet-chemical oxidation, nondispersive infrared detector

Trace elements

Aluminum, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Antimony, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Arsenic, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Barium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Beryllium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Boron, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Cadmium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Chromium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Cobalt, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Copper, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Iron, dissolved Fishman (1993) Inductively Coupled Plasma–Atomic Emission Spectrometry

Lead, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Lithium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Manganese, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Molybdenum, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Nickel, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Selenium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Silver, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Strontium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Thallium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Uranium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Vanadium, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Zinc, dissolved Garbarino and others (2006) Inductively Coupled Plasma–Mass Spectrometry

Suspended-sediment

Suspended-sediment Guy (1969) Evaporation

Percent finer than 0.062 mm Guy (1969) Pipet
10 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Table 4. Physical field parameters measured at surface-water sites in the Chulitna River basin, Alaska, March 2010–June 2012.

[Number in parentheses below constituent is number used by both U.S. Environmental Protection Agency and U.S. Geological Survey to identify parameters in 

computerized databases. Values represent the average of the cross section. Measurements were taken at four to five locations along the cross section. Site No.:

Location of site No. is shown in figure 3. Abbreviations: ft3/s, cubic foot per second; mg/L, milligram per liter; μs/cm at 25°C, microsiemens per centimeter at 

25 degrees Celsius; °C, degrees Celsius; LED, light-emitting diode; nm, nanometer; FNU, Formazin Nephelometric Unit; <, less than; –, not measured]

Site 

No. Date Time

Streamflow

(ft3

/s)

(00061)

Dissolved

oxygen

(mg/L)

(00300)

pH

(units)

(00400)

Specific 

conductance

(μs/cm at

25°C)

(00095)

Water

temperature

(°C)

(00010)

Turbidity, water, unfiltered,

near infra-red LED light,

780–900 nm detection angle

90 ± 2.5 degrees (FNU)

(63680)

Chulitna River 0.4 mile above Nikabuna Lake, near Nondalton

1 03-25-2010 1504 52 6.8 6.8 131 0.4 –

07-22-2010 1725 791 10.1 7.4 62 11.3 13

03-09-2011 1602 65 7.4 6.9 131 0.0 <2.0

08-23-2011 1430 1,020 9.5 7.0 61 11.4 9.2

03-14-2012 1325 88 9.4 7.0 122 0.0 <2

Hoknede Lake Creek 0.4 mile below Hoknede Lake, near Nondalton

2 03-24-2010 1410 2.9 9.5 6.8 63 1.4 –

07-22-2010 1608 20 10.9 7.6 47 13.5 2.5

03-09-2011 1334 2.7 10.3 6.9 68 0.6 <2.0

08-23-2011 1720 24 10.7 7.5 43 14.4 <2.0

03-13-2012 1600 3 9.6 6.6 41 0.4 <2

Koksetna River 0.1 mile above mouth, near Nondalton

3 03-25-2010 1215 109 13.0 7.4 97 0.0 –

07-22-2010 1344 1,070 11.7 7.9 79 10.0 3.1

03-08-2011 1535 76 13.3 7.4 98 0.0 <2.0

08-24-2011 1341 1,310 12.0 7.6 79 8.0 <2.0

03-12-2012 1730 159 14 7.3 91 0.0 <2

Chulitna River 0.3 mile above Koksetna River, near Nondalton

4 03-25-2010 1050 106 6.4 6.8 129 0.0 –

07-22-2010 1445 1,100 10.5 7.7 65 12.4 4.8

03-08-2011 1418 138 9.4 6.9 126 0.0 <2.0

08-24-2011 1300 1,670 10.2 7.4 66 11.8 <2.0

03-13-2012 1436 212 7.5 6.7 119 0.0 <2

Chulitna River 5 miles above mouth, near Port Alsworth

5 03-23-2010 1810 277 – 7.0 114 0.1 –

05-25-2010 2046 2,230 12.6 7.5 59 9.7 4.1

07-21-2010 1912 2,770 11.5 7.6 71 10.9 9.0

08-18-2010 1531 5,830 10.7 7.3 57 10.0 5.1

09-29-2010 1300 1,830 12.3 7.5 78 3.3 6.1

03-09-2011 1100 331 10.7 6.9 108 0.0 <2.0

05-26-2011 1752 2,580 12.1 7.5 63 7.8 8.4

07-13-2011 1410 2,530 11.1 7.4 68 10.2 2.5

08-24-2011 1656 3,190 11.5 7.4 72 10.2 <2.0

09-27-2011 1728 1,960 12.0 7.3 76 7.0 <2.0

03-14-2012 1545 457 9.9 7.0 105 0.0 <2.0

06-19-2012 1408 3,480 11.5 7.5 66 10.3 7.0
Tables 11

Table 5. Concentrations of major ions in water samples collected at USGS streamflow-gaging station 15298040, Chulitna River 5 miles 

above mouth, near Port Alsworth, Alaska, March 2010–June 2012.

[Number in parentheses below constituent is number used by both U.S. Environmental Protection Agency and U.S. Geological Survey to identify parameters in 

computerized databases. Location of Site No. is shown in figure 3. All values in milligrams per liter. Abbreviation: E, estimated]

Date Time Alkalinity

(39086)

Bicarbonate

(00453)

Calcium

(00915)

Chloride

(00940)

Dissolved 

solids

(70300)

Fluoride

(00950)

Magnesium

(00925)

Potassium

(00935)

Silica

(00955)

Sodium

(00930)

Sulfate

(00945)

Site 5 – Chulitna River 5 miles above mouth, near Port Alsworth (15298040)

03-23-2010 1810 46 56 14.5 0.808 66 0.080 2.48 0.694 12.0 2.66 8.43

05-25-2010 1530 23 28 7.38 .590 48 .084 1.39 .610 6.34 1.68 4.20

07-21-2010 1720 33 40 9.10 .348 61 E.058 1.77 .320 7.15 1.79 5.78

08-18-2010 1450 21 25 7.64 .345 46 E.049 1.48 .339 7.90 1.61 4.96

09-29-2010 1230 28 34 10.2 .497 51 E.061 1.88 .402 8.15 2.17 6.67

03-09-2011 1740 40 49 15.3 .709 66 .062 2.65 .632 11.8 2.72 8.80

05-26-2011 1740 22 27 8.43 .543 42 .049 1.54 .486 6.91 1.77 6.29

07-13-2011 1320 25 31 8.97 .380 50 .061 1.73 .318 8.03 1.86 5.36

08-24-2011 1710 29 35 8.96 .422 58 .056 1.79 .349 8.41 1.94 5.18

09-27-2011 1740 30 37 10.2 .614 60 .041 1.96 .454 9.13 2.02 5.08

03-14-2012 1510 52 64 15.5 .81 67 .075 2.92 .587 13.3 2.81 7.87

06-19-2012 1350 24 29 8.29 .49 44 .082 1.51 .354 6.66 1.76 4.90
12 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Table 6. Dissolved trace-element concentrations in water samples collected at USGS streamflow-gaging station 15298040, 

Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, March 2010–June 2012.

[Number in parentheses below constituent is number used by both U.S. Environmental Protection Agency and U.S. Geological Survey to identify 

parameters in computerized databases. Location of Site No. is shown in figure 3. All values in micrograms per liter. Abbreviations: E,estimated; 

<, less than]

Site 5 – Chulitna River 5 miles above mouth, near Port Alsworth (15298040)

Date Time Aluminum

(01106)

Antimony

(01095)

Arsenic

(01000)

Barium

(01005)

Beryllium

(01010)

03-23-2010 1810 E2.9 0.09 1.21 7.08 <0.012

05-25-2010 1530 18.3 .19 1.56 4.25 <.012

07-21-2010 1720 17.1 .145 1.27 4.24 <.012

08-18-2010 1450 45.0 .099 1.21 3.79 E.006

09-29-2010 1230 12.2 .174 1.33 4.20 <.012

03-09-2011 1740 3.8 .116 1.02 5.47 <.006

05-26-2011 1740 17.9 .143 .943 4.28 <.006

07-13-2011 1320 19.6 .108 1.25 4.21 <.006

08-24-2011 1710 16.1 .096 1.59 3.87 <.006

09-27-2011 1740 12.6 .084 1.68 4.52 <.006

03-14-2012 1510 4.4 .085 1.31 6.46 <.006

06-19-2012 1350 9.9 .129 1.16 3.67 <.006

Boron

(01020)

Cadmium

(01025)

Chromium

(01030)

Cobalt

(01035)

Copper

(01040)

Iron

(01046)

Lead

(01049)

3.95 <0.02 E0.067 0.806 <1.0 257 0.122

E2.72 E.013 E.104 1.040 E.92 356 .0699

2.94 <.02 E.101 .268 E.87 151 .0677

2.98 <.02 .154 .157 E.70 200 .0449

E2.73 <.02 .121 1.690 E.64 263 .0504

3.68 <.016 .090 .534 <.50 212 .0239

<3 <.016 .072 .798 .51 176 .0716

<3 <.016 .137 .200 .55 162 .0595

<3 <.016 .116 .334 .56 241 .0380

<3 <.016 .099 1.480 <.50 363 .0432

3.83 <.016 .303 .072 <.80 310 .0251

3.40 <.016 .076 .402 <.80 125 .1315

Lithium

(01130)

Manganese

(01056)

Molybdenum

(01060)

Nickel

(01065)

Selenium

(01145)

Silver

(01075)

Strontium

(01080)

1.30 36.7 0.375 0.239 0.152 <0.010 76.4

.571 14.2 .304 .471 .0688 <.010 39.4

.577 15.3 .280 .266 .0800 <.010 52.4

.656 11.0 .277 .302 .0947 E.006 43.2

.600 26.2 .316 .641 .0898 <.010 56.2

.942 30.2 .343 .509 .1454 <.005 72.5

.573 10.0 .319 .497 .1132 <.005 44.9

.665 12.7 .356 .241 .1173 <.005 50.0

.690 12.7 .341 .337 .1017 <.005 57.1

.841 22.7 .357 .402 .0897 <.005 57.4

.944 62.1 .394 .202 .1211 <.005 78.5

.592 10.3 .353 .242 .1207 <.005 47.4

Thallium

(01057)

Uranium

(22703)

Vanadium

(01085)

Zinc

(01090)

<0.020 0.0293 E0.139 <2.8

<.020 .0221 .521 <2.8

<.020 .0234 .314 <2.8

<.020 .0266 .360 <2.8

<.020 .0257 .238 <2.8

<.010 .0233 .156 <1.4

<.010 .0170 .307 <1.4

<.010 .0223 .266 <1.4

<.010 .0235 .272 <1.4

<.010 .0257 .279 <1.4

.066 .0287 .162 <1.4

<.010 .0216 .220 <1.4
Tables 13

Table 7. Concentrations of nutrients, dissolved organic carbon, and suspended sediment in water samples collected at USGS 

streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, March 2010–June 2012. 

[Number in parentheses below constituent is number used by both U.S. Environmental Protection Agency and U.S. Geological Survey to identify parameters in 

computerized databases. All values in milligrams per liter unless otherwise noted. Abbreviations: mm, millimeter; E, estimated; <, less than; –, constituent not 

measured]

Date Time

Dissolved

ammonia

nitrogen 

(NH4

)

(00608)

Dissolved

nitrogen

(NH4

+Org)

(00623)

Total

nitrogen

(NH4 + 

Org)

(00625)

Dissolved

nitrogen

(NO2

+NO3)

(00631)

Dissolved

nitrogen

(NO2

)

(00613)

Dissolved

phosphorus

(P)

(00666)

Dissolved

phosphorus

ortho

(PO4

)

(00671)

Total

phosphorus

(P)

(00665)

Dissolved 

organic

carbon

(DOC)

(00681)

Suspended 

sediment

(80154)

Percent 

finer than

0.0625 

(mm)

(70331)

Site 5 – Chulitna River 5 miles above mouth, near Port Alsworth (15298040)

03-23-2010 1810 E0.016 0.101 E0.085 0.179 <0.002 E0.0037 0.0086 0.0088 1.01 2 86

05-25-2010 1530 <.020 .173 .234 .0958 <.002 .0070 E.0054 .0243 3.53 12 90

07-21-2010 1720 <.020 .165 .266 .0968 E.0017 <.006 E.0072 .0288 4.25 22 87

08-18-2010 1450 <.020 .175 .227 .0699 E.0012 E.0048 E.0058 .0298 5.26 21 70

09-29-2010 1230 <.020 .175 .249 .0749 <.002 E.0047 E.0063 .0222 3.25 9 95

03-09-2011 1740 .015 .092 .057 .175 <.001 .0064 .00566 .0074 1.18 2 92

05-26-2011 1740 <.010 .085 .188 .176 <.001 .0046 <.004 .0276 2.19 20 86

07-13-2011 1320 <.010 .117 .196 .067 .001 .0032 .00587 .0139 3.72 9 95

08-24-2011 1710 <.010 .150 .213 .056 <.001 .0043 <.004 .0146 4.45 6 79

09-27-2011 1740 .011 .167 .166 .044 <.001 .0047 .00467 .0142 3.71 4 87

03-14-2012 1510 .019 .104 E.072 .165 .001 .0099 .00683 E.0128 1.59 2 90

06-19-2012 1350 .014 .098 .129 .117 <.001 <.0030 <.004 .0137 2.42 9 –

Table 8. Results from a blank sample collected at USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near 

Port Alsworth, Alaska, August 18, 2010.

[Number in parentheses below constituent is number used by both U.S. Environmental Protection Agency and U.S. Geological Survey to identify parameters in 

computerized databases. All values in milligrams per liter unless otherwise noted. Abbreviations: μg/L, microgram per liter; E, estimated; <, less than]

Date Time Alkalinity

(39086)

Calcium

(00915)

Chloride

(00940)

Dissolved 

solids

(70300)

Fluoride

(00950)

Magnesium

(00925)

Potassium

(00935)

Silica

(00955)

Sodium

(00930)

Sulfate

(00945)

08-18-2010 1458 <8.0 <0.044 E0.08 <10 <0.08 <0.016 <0.06 <0.058 <0.10 <0.18

Dissolved

ammonia

nitrogen 

(NH4

)

(00608)

Dissolved

nitrogen

(NH4

+Org)

(00623)

Total

nitrogen

(NH4

 + Org)

(00625)

Dissolved

nitrogen

(NO2

+NO3)

(00631)

Dissolved

nitrogen

(NO2

)

(00613)

Dissolved

phosphorus

(P)

(00666)

Phosphorus

ortho

(PO4

)

(00671)

Total

phosphorus

(P)

(00665)

Dissolved

organic

carbon

(DOC)

(00681)

Aluminum

(01106)

(μg/L)

Antimony

(01095) 

(μg/L)

Arsenic

(01000) 

(μg/L)

<0.020 <0.10 <0.10 <0.016 <0.002 <0.006 <0.008 <0.008 <0.66 <3.4 E0.04 <0.04

Barium

(01005) 

(μg/L)

Beryllium

(01010) 

(μg/L)

Boron

(01020) 

(μg/L)

Cadmium

(01025) 

(μg/L)

Chromium

(01080) 

(μg/L)

Cobalt

(01035) 

(μg/L)

Copper

(01040) 

(μg/L)

Iron

(10146) 

(μg/L)

Lead

(01049) 

(μg/L)

Lithium

(01130) 

(μg/L)

Manganese

(01056) 

(μg/L)

Molybdenum

(01060) 

(μg/L)

<0.14 <0.012 <3 <0.020 <0.12 0.109 <1.0 <6.0 <0.030 <0.44 E0.23 <0.028

Nickel

(01065) 

(μg/L)

Selenium

(01145) 

(μg/L)

Silver

(01075) 

(μg/L)

Strontium

(01080) 

(μg/L)

Thallium

(01057) 

(μg/L)

Uranium

(22703) 

(μg/L)

Vanadium

(01085) 

(μg/L)

Zinc

(01090) 

(μg/L)

<0.12 <0.04 <0.010 <0.40 <0.020 <0.008 <0.16 <2.8
14 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Table 9. Results from a replicate sample collected at USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, 

near Port Alsworth, Alaska, March 9, 2011.

[Number in parentheses below constituent is number used by both U.S. Environmental Protection Agency and U.S. Geological Survey to identify parameters in 

computerized databases. Abbreviations: mg/L, milligram per liter; μg/L, microgram per liter; E, estimated; <, less than]

Date Time

Calcium

(mg/L)

(00915)

Chloride

(mg/L)

(00940)

Dissolved 

solids

(mg/L)

(70300)

Fluoride

(mg/L)

(00950)

Magnesium

(mg/L)

(00925)

Potassium

(mg/L)

(00935)

Silica

(mg/L)

(00955)

Sodium

(mg/L)

(00930)

Sulfate

(mg/L)

(00945)

Sample 03-09-11 1740 15.3 0.71 66 0.06 2.65 0.63 11.8 2.72 8.80

Replicate 03-09-11 1750 15.1 .71 69 .08 2.62 .58 11.8 2.71 8.87

Dissolved

ammonia

nitrogen 

(NH4

)

(mg/L)

(00608)

Dissolved

nitrogen

(NH4

+Org)

(mg/L)

(00623)

Total

nitrogen

(NH4

 + Org)

(mg/L)

(00625)

Dissolved

nitrogen

(NO2

+NO3)

(mg/L)

(00631)

Dissolved

nitrogen

(NO2

)

(mg/L)

(00613)

Dissolved

phosphorus

(P)

(mg/L)

(00666)

Phosphorus

Ortho

(PO4

)

(mg/L)

(00671)

Total

phosphorus

(P)

(mg/L)

(00665)

Dissolved 

organic

carbon

(DOC)

(mg/L)

(00681)

Aluminum

(μg/L)

(01106)

Antimony

(μg/L)

(01095)

Sample 0.015 0.09 0.06 0.175 <0.001 0.006 0.006 0.007 1.18 3.8 0.116

Replicate .016 .06 .23 .180 <.001 .010 .006 .008 1.45 3.4 .129

Arsenic

(μg/L)

(01000)

Barium

(μg/L)

(01005)

Beryllium

(μg/L)

(01010)

Boron

(μg/L)

(01020)

Cadmium

(μg/L)

(01025)

Chromium

(μg/L)

(01030)

Cobalt

(μg/L)

(01035)

Copper

(μg/L)

(01040)

Iron

(μg/L)

(01046)

Lead

(μg/L)

(01049)

Lithium

(μg/L)

(01130)

Sample 1.0 5.47 <0.006 4 <0.016 0.09 0.534 <0.50 212 0.024 0.94

Replicate 1.0 5.55 <.006 4 <.016 .09 .849 <.50 204 .024 .96

Manganese

(μg/L)

(01056)

Molybdenum

(μg/L)

(01060)

Nickel

(μg/L)

(01065)

Selenium

(μg/L)

(01145)

Silver

(μg/L)

(01075)

Strontium

(μg/L)

(01080)

Thallium

(μg/L)

(01057)

Uranium

(μg/L)

(22703)

Vanadium

(μg/L)

(01085)

Zinc

(μg/L)

(01090)

Sample 30.2 0.343 0.51 0.15 0.005 72.5 <0.010 0.023 0.16 <1.4

Replicate 30.8 .346 .53 .14 .005 72.3 <.010 .022 .14 <1.4
Tables 15

Table 10. Water temperature data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

Temperature, water, degrees Celsius, water year October 2009 to September 2010

October November December January

Max Min Mean Max Min Mean Max Min Mean Max Min Mean

1 – – – 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

2 – – – 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

3 – – – 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

4 – – – 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

5 – – – 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

6 – – – 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

7 – – – 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

8 7.0 6.0 6.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

9 8.0 7.0 7.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

10 8.5 8.0 8.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

11 8.0 7.5 8.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

12 8.5 8.0 8.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

13 8.5 8.0 8.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

14 8.0 7.5 7.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

15 7.5 6.0 6.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

16 6.0 5.0 5.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

17 5.5 4.5 4.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

18 4.5 4.0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

19 4.0 3.5 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

20 4.0 3.5 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

21 4.0 3.0 3.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

22 3.0 2.5 2.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

23 3.0 2.5 2.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

24 3.5 3.0 3.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

25 3.5 3.0 3.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

26 3.0 2.0 2.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

27 2.0 1.0 1.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

28 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

29 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

31 0.0 0.0 0.0 – – – 0.0 0.0 0.0 0.0 0.0 0.0 

Month – – – 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 
16 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Table 10. Water temperature data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

Temperature, water, degrees Celsius, water year October 2009 to September 2010

February March April May

Max Min Mean Max Min Mean Max Min Mean Max Min Mean

1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.5 0.0 0.0 

4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.5 0.0 0.0 

5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.0 0.0 0.5 

6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.0 1.5 2.0 

7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.5 1.5 2.5 

8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.0 1.5 2.5 

9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.5 2.5 3.0 

10 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.0 2.5 3.0 

11 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.0 2.5 3.0 

12 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.0 2.5 3.0 

13 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.5 2.0 3.0 

14 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.5 2.5 3.0 

15 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 6.0 3.5 4.5 

16 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 6.5 5.0 5.5 

17 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 7.0 5.0 6.0 

18 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 7.0 5.0 6.0 

19 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 7.5 6.0 7.0 

20 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 8.5 7.0 7.5 

21 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 8.5 6.0 7.5 

22 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 8.5 7.5 7.5 

23 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 8.0 6.5 7.5 

24 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 8.0 7.0 7.5 

25 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 10.0 7.0 8.0 

26 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 12.0 8.5 10.0 

27 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 13.0 10.0 11.0 

28 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 12.5 10.5 11.0 

29 – – – 0.0 0.0 0.0 0.0 0.0 0.0 13.0 10.0 11.5 

30 – – – 0.0 0.0 0.0 0.0 0.0 0.0 13.5 11.5 12.5 

31 – – – 0.0 0.0 0.0 – – – 13.5 11.5 12.5 

Month 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 13.5 0.0 5.4 
Tables 17

Table 10. Water temperature data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day

Temperature, water, degrees Celsius, water year October 2009 to September 2010

June July August September

Max Min Mean Max Min Mean Max Min Mean Max Min Mean

1 14.0 11.5 12.5 14.5 12.5 13.0 11.0 10.0 10.5 11.5 10.5 11.0 

2 13.5 12.0 12.5 12.5 11.0 12.0 13.5 10.5 11.5 11.0 10.0 10.5 

3 12.5 10.5 11.5 13.0 11.5 12.0 13.5 12.0 12.5 11.0 9.5 10.5 

4 10.5 9.5 10.0 13.0 12.0 12.5 12.5 12.0 12.0 11.0 10.5 10.5 

5 10.0 7.5 9.0 12.5 11.5 12.0 12.5 11.5 12.0 11.0 10.0 10.5 

6 11.0 9.0 10.0 11.5 10.5 10.5 12.0 11.0 11.5 11.0 10.0 10.5 

7 11.5 10.0 10.5 10.5 10.0 10.0 11.0 10.0 10.5 11.0 10.5 11.0 

8 12.5 10.0 11.5 12.5 9.5 11.0 10.0 10.0 10.0 10.5 10.0 10.5 

9 12.5 10.5 11.0 12.5 11.0 12.0 10.0 10.0 10.0 10.0 9.5 10.0 

10 11.5 10.0 10.5 12.0 11.5 12.0 10.0 9.5 10.0 10.5 9.0 9.5 

11 12.5 9.5 11.0 12.0 11.0 11.5 10.0 9.0 9.5 10.5 9.0 9.5 

12 13.0 11.0 12.0 14.5 11.5 12.5 9.0 8.5 9.0 10.5 9.0 10.0 

13 14.0 11.5 12.5 14.5 13.0 13.5 10.0 9.0 9.5 11.0 9.5 10.0 

14 13.5 11.5 12.5 14.0 12.5 13.0 12.0 10.0 10.5 11.0 9.5 10.0 

15 11.5 9.5 10.5 14.0 12.5 13.0 12.0 11.5 11.5 11.0 9.0 10.0 

16 10.0 9.0 9.5 15.0 12.0 13.5 11.5 10.5 10.5 11.0 9.5 10.0 

17 10.5 9.0 9.5 16.0 13.5 14.5 10.5 10.0 10.5 10.5 9.5 10.0 

18 11.0 9.5 10.0 16.0 14.5 15.0 10.0 9.5 10.0 10.0 9.0 9.5 

19 12.5 10.0 11.0 14.5 12.5 13.5 10.5 9.0 9.5 10.0 8.5 9.5 

20 13.5 10.5 12.0 12.5 11.0 12.0 11.0 9.5 10.0 10.0 8.5 9.0 

21 15.0 12.0 13.0 11.5 10.0 11.0 11.0 10.0 10.5 9.5 8.5 9.0 

22 15.5 13.5 14.5 12.5 10.5 11.5 12.0 10.5 11.0 9.5 8.5 9.0 

23 17.0 14.5 15.5 12.0 10.0 11.0 12.5 10.5 11.5 8.5 7.5 8.0 

24 16.5 14.5 15.5 10.0 9.0 9.5 13.5 11.5 12.5 8.0 6.5 7.0 

25 15.5 13.5 14.5 9.0 9.0 9.0 13.5 12.0 12.5 7.0 5.5 6.0 

26 15.0 13.5 14.5 9.5 8.5 9.0 13.5 12.5 13.0 5.5 4.0 4.5 

27 15.0 13.5 14.0 10.0 9.0 9.5 13.0 12.5 12.5 4.0 2.5 3.0 

28 15.0 12.5 13.5 10.0 9.5 9.5 12.5 11.5 11.5 3.0 2.0 2.5 

29 14.5 13.5 14.0 10.0 9.0 9.5 12.0 10.5 11.5 4.0 2.5 3.5 

30 15.0 12.5 13.5 9.5 9.0 9.0 12.0 11.0 11.5 5.0 4.0 4.5 

31 – – – 10.0 9.5 9.5 12.0 11.0 11.5 – – – 

Month 17.0 7.5 12.1 16.0 8.5 11.5 13.5 8.5 11.0 11.5 2.0 8.6 
18 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Table 10. Water temperature data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

Temperature, water, degrees Celsius, water year October 2010 to September 2011

October November December January

Max Min Mean Max Min Mean Max Min Mean Max Min Mean

1 6.0 5.0 5.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

2 5.5 5.5 5.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

3 5.5 4.0 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

4 4.0 3.5 3.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

5 4.0 3.0 3.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

6 3.5 2.0 3.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

7 3.0 2.0 2.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

8 2.5 1.5 2.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

9 2.5 2.0 2.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

10 2.0 1.5 2.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

11 2.0 1.5 2.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

12 2.0 1.0 1.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

13 1.5 0.5 1.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

14 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

15 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

16 1.0 0.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

17 2.0 1.0 1.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

18 2.0 2.0 2.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

19 2.0 1.5 1.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

20 2.0 1.5 1.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

21 2.5 2.0 2.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

22 3.0 2.0 2.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

23 3.0 2.5 2.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

24 2.5 2.5 2.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

25 2.5 1.5 2.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

26 1.5 1.5 1.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

27 1.5 0.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

28 1.0 1.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

29 1.0 1.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

30 1.0 0.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 – – – 

31 0.0 0.0 0.0 – – – 0.0 0.0 0.0 – – – 

Month 6.0 0.0 2.0 0.0 0.0 0.0 0.0 0.0 0.0 – – – 
Tables 19

Table 10. Water temperature data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

Temperature, water, degrees Celsius, water year October 2010 to September 2011

February March April May

Max Min Mean Max Min Mean Max Min Mean Max Min Mean

1 – – – – – – 0.0 0.0 0.0 0.0 0.0 0.0

2 – – – – – – 0.0 0.0 0.0 2.0 0.0 0.5

3 – – – – – – 0.0 0.0 0.0 3.0 1.0 2.0

4 – – – – – – 0.0 0.0 0.0 3.5 1.5 2.5

5 – – – – – – 0.0 0.0 0.0 3.5 1.5 2.5

6 – – – – – – 0.0 0.0 0.0 4.5 1.5 3.0

7 – – – – – – 0.0 0.0 0.0 4.0 2.0 3.0

8 – – – – – – 0.0 0.0 0.0 3.5 2.5 3.0

9 – – – 0.0 0.0 0.0 0.0 0.0 0.0 4.0 2.5 3.0

10 – – – 0.0 0.0 0.0 0.0 0.0 0.0 5.5 2.5 3.5

11 – – – 0.0 0.0 0.0 0.0 0.0 0.0 6.0 3.5 4.5

12 – – – 0.0 0.0 0.0 0.0 0.0 0.0 6.0 3.0 4.5

13 – – – 0.0 0.0 0.0 0.0 0.0 0.0 7.5 4.0 5.5

14 – – – 0.0 0.0 0.0 0.0 0.0 0.0 7.0 6.0 6.0

15 – – – 0.0 0.0 0.0 0.0 0.0 0.0 6.0 5.0 5.5

16 – – – 0.0 0.0 0.0 0.0 0.0 0.0 6.0 5.0 5.5

17 – – – 0.0 0.0 0.0 0.0 0.0 0.0 6.0 5.0 5.5

18 – – – 0.0 0.0 0.0 0.0 0.0 0.0 7.0 5.0 6.0

19 – – – 0.0 0.0 0.0 0.0 0.0 0.0 7.0 6.5 7.0

20 – – – 0.0 0.0 0.0 0.0 0.0 0.0 7.0 5.5 6.0

21 – – – 0.0 0.0 0.0 0.0 0.0 0.0 8.0 6.0 7.0

22 – – – 0.0 0.0 0.0 0.0 0.0 0.0 8.5 6.5 7.5

23 – – – 0.0 0.0 0.0 0.0 0.0 0.0 8.5 7.0 7.5

24 – – – 0.0 0.0 0.0 0.0 0.0 0.0 7.5 6.5 7.0

25 – – – 0.0 0.0 0.0 0.0 0.0 0.0 8.5 5.5 7.0

26 – – – 0.0 0.0 0.0 0.0 0.0 0.0 8.5 7.5 8.0

27 – – – 0.0 0.0 0.0 0.0 0.0 0.0 10.0 7.5 8.5

28 – – – 0.0 0.0 0.0 0.0 0.0 0.0 10.0 9.0 9.5

29 – – – 0.0 0.0 0.0 0.0 0.0 0.0 9.5 8.5 9.0

30 – – – 0.0 0.0 0.0 0.0 0.0 0.0 11.0 8.5 9.5

31 – – – 0.0 0.0 0.0 – – – 11.0 9.5 10.0

Month – – – – – – 0.0 0.0 0.0 11.0 0.0 5.5
20 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Table 10. Water temperature data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day

Temperature, water, degrees Celsius, water year October 2010 to September 2011

June July August September

Max Min Mean Max Min Mean Max Min Mean Max Min Mean

1 9.5 7.5 8.5 13.5 11.0 12.0 13.5 12.5 12.5 10.5 9.5 10.0

2 10.5 7.0 8.0 13.5 12.0 12.5 12.5 11.5 11.5 10.5 10.0 10.0

3 10.0 8.5 9.0 12.5 12.0 12.0 11.5 10.5 11.0 10.5 10.0 10.0

4 8.5 7.5 8.0 12.0 11.0 11.5 11.5 10.5 11.0 10.5 9.5 10.0

5 9.5 7.0 8.0 13.5 10.5 11.5 10.5 9.5 10.0 10.5 9.0 9.5

6 9.0 7.5 8.5 14.5 12.5 13.0 10.5 9.0 9.5 10.0 8.5 9.0

7 9.0 8.0 8.5 14.0 12.5 13.0 10.5 8.5 9.5 10.0 9.0 9.5

8 9.5 7.5 8.5 12.5 11.0 11.5 10.0 9.5 9.5 10.0 9.5 9.5

9 10.0 8.5 9.0 12.0 11.0 11.5 10.0 8.5 9.0 10.0 8.0 9.0

10 11.0 9.0 10.0 11.5 10.5 11.0 11.0 9.5 10.0 9.5 9.0 9.5

11 11.0 10.0 10.5 11.0 10.5 10.5 12.0 10.0 11.0 10.5 9.0 10.0

12 11.0 10.0 10.5 11.0 10.5 10.5 11.5 11.0 11.5 10.0 9.0 9.5

13 10.5 10.0 10.5 11.5 10.0 10.5 12.0 11.0 11.5 9.5 9.0 9.5

14 10.5 9.5 10.0 12.0 10.5 11.0 12.5 12.0 12.0 9.5 9.0 9.0

15 11.0 8.5 9.5 14.0 11.0 12.0 12.5 11.0 12.0 9.5 8.5 9.0

16 13.0 9.5 11.0 15.0 12.5 13.5 13.0 11.0 12.0 9.0 8.0 9.0

17 13.5 11.0 12.5 15.0 12.0 13.0 13.5 12.0 13.0 9.0 8.0 8.5

18 14.5 12.0 13.0 12.5 11.0 11.5 13.0 12.0 12.5 9.0 8.0 8.5

19 14.0 12.0 13.0 14.5 11.0 12.5 13.0 11.5 12.0 8.5 7.5 8.0

20 12.0 9.5 11.0 15.0 13.0 14.0 12.0 11.0 11.5 8.5 7.5 8.0

21 9.5 8.0 8.5 14.5 13.5 14.0 12.0 11.0 11.5 9.0 8.0 8.5

22 9.0 8.0 8.0 16.0 13.0 14.5 12.0 11.0 11.0 9.0 8.0 8.5

23 11.0 8.0 9.0 16.0 13.5 14.5 11.5 10.0 11.0 8.5 7.5 8.0

24 12.0 10.0 11.0 13.5 11.5 12.0 11.0 10.0 10.5 8.5 7.5 7.5

25 12.0 10.5 11.0 12.0 10.5 11.0 11.0 10.0 10.5 8.0 6.5 7.5

26 11.5 9.5 10.5 12.5 11.0 12.0 12.0 10.0 11.0 8.0 6.5 7.0

27 11.5 10.5 11.0 13.5 11.5 12.5 11.5 10.0 10.5 7.5 6.5 7.0

28 10.5 9.5 10.0 14.5 12.0 13.0 12.5 10.5 11.0 7.0 5.5 6.0

29 10.5 9.0 10.0 14.0 13.0 13.5 12.0 10.5 11.5 6.5 5.5 6.0

30 12.0 10.0 11.0 14.5 13.0 13.5 12.5 11.5 12.0 5.5 4.0 4.5

31 – – – 14.5 13.0 13.5 12.0 10.5 11.0 – – –

Month 14.5 7.0 9.9 16.0 10.0 12.3 13.5 8.5 11.1 10.5 4.0 8.5
Tables 21

Table 11. Dissolved oxygen data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

Dissolved oxygen, water, unfiltered, milligrams per liter, water year October 2009 to September 2010

April May June July August September

Max Min Max Min Max Min Max Min Max Min Max Min 

1 – – – – 11.5 10.9 11.3 10.3 11.1 10.9 10.6 10.2 

2 – – – – 11.4 10.7 11.4 10.8 11.0 10.6 10.7 10.3 

3 – – – – 11.6 10.8 11.4 10.8 10.6 10.3 10.7 10.4 

4 – – – – 12.2 11.4 11.2 10.5 10.5 10.2 10.4 10.2 

5 – – – – 12.6 12.1 11.3 10.6 10.4 10.2 10.5 10.2 

6 – – – – 12.4 11.8 11.8 11.0 10.4 10.1 10.5 10.3 

7 – – – – 12.1 11.5 11.8 11.3 10.7 10.3 10.4 10.1 

8 – – – – 12.0 11.5 11.9 11.3 10.7 10.6 10.7 10.3 

9 – – – – 11.9 11.2 11.5 10.9 10.7 10.5 10.8 10.5 

10 – – – – 12.1 11.4 11.3 10.6 10.8 10.5 10.9 10.5 

11 – – – – 12.0 11.5 11.4 10.6 11.1 10.7 11.0 10.5 

12 – – – – 11.7 11.1 11.2 10.6 11.2 11.0 11.0 10.5 

13 – – – – 11.6 10.9 10.8 10.0 11.1 10.8 11.0 10.4 

14 – – – – 11.4 10.7 11.1 10.2 10.8 10.4 10.9 10.3 

15 – – – – 11.8 11.0 11.1 10.3 10.4 10.1 10.9 10.4 

16 – – – – 12.1 11.6 11.3 10.4 10.5 10.3 10.9 10.3 

17 – – – – 12.3 11.7 11.1 9.8 10.8 10.3 10.9 10.3 

18 – – – – 12.3 11.6 10.6 9.6 10.8 10.6 11.0 10.5 

19 – – – – 12.1 11.4 10.8 9.8 11.0 10.7 11.0 10.5 

20 – – – – 12.0 11.1 11.0 10.4 10.8 10.5 11.1 10.5 

21 – – – – 11.6 10.8 11.7 10.8 10.6 10.3 11.0 10.6 

22 – – – – 11.3 10.3 11.6 10.9 10.5 10.3 11.1 10.4 

23 – – – – 11.1 10.2 11.3 10.8 10.6 10.2 11.2 10.6 

24 – – – – 10.9 9.9 11.7 11.2 10.2 10.0 11.2 10.6 

25 – – – – 11.1 10.2 11.8 11.3 10.2 9.9 11.6 10.9 

26 – – 12.5 11.9 11.1 10.2 11.8 11.4 10.0 9.8 12.2 11.3 

27 – – 12.2 11.7 10.9 10.0 11.7 11.4 10.1 9.7 12.7 12.0 

28 – – 12.2 11.5 11.3 10.4 11.5 11.2 10.3 9.9 12.8 12.2 

29 – – 11.9 11.5 11.1 10.2 11.5 11.2 10.4 10.1 – 12.2 

30 – – 11.6 11.1 11.3 10.3 11.4 11.2 10.3 10.1 – – 

31 – – 11.6 10.8 – – 11.2 11.0 10.4 10.1 – – 

Month – – – – 12.6 9.9 11.9 9.6 11.2 9.7 – – 
22 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Table 11. Dissolved oxygen data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

Dissolved oxygen, water, unfiltered, milligrams per liter, water year October 2010 to September 2011

April May June July August September

Max Min Max Min Max Min Max Min Max Min Max Min 

1 – – – – 12.1 11.3 11.0 10.6 10.5 10.1 11.4 10.9 

2 – – – – 12.2 11.5 10.8 10.3 10.8 10.3 11.1 10.7 

3 – – – – 11.8 11.1 11.0 10.3 11.0 10.6 11.1 10.6 

4 – – – – 12.3 11.5 11.1 10.5 11.0 10.5 11.2 10.6 

5 – – – – 12.3 11.8 11.2 10.7 11.5 10.9 11.0 10.4 

6 – – – – 12.3 11.7 10.9 10.3 11.4 11.1 – – 

7 – – – – 12.0 11.5 10.9 10.3 11.7 11.3 11.3 10.5 

8 – – – – 12.2 11.7 11.1 10.5 11.4 11.2 11.7 10.8 

9 – – – – 12.0 11.4 11.1 10.6 11.6 11.2 12.2 11.2 

10 – – – – 11.8 11.2 11.4 10.8 11.4 11.0 – – 

11 – – – – 11.7 10.9 11.3 11.0 11.3 10.7 – – 

12 – – – – 11.6 10.9 11.3 10.8 11.0 10.7 – – 

13 – – – – 11.6 10.9 11.6 11.0 11.0 10.6 – – 

14 – – – – 11.7 10.9 11.5 11.0 10.8 10.2 – – 

15 – – – – 11.8 11.4 11.3 10.8 10.9 10.4 – – 

16 – – – – 11.7 11.0 11.0 10.4 10.9 10.4 – – 

17 – – – – 11.3 10.6 10.8 10.2 10.8 10.2 – – 

18 – – – – 11.1 10.4 11.4 10.8 10.7 10.1 – – 

19 – – – – 11.0 10.2 11.2 10.7 10.4 9.9 – – 

20 – – – – 11.3 10.4 11.0 10.2 10.6 9.8 – – 

21 – – – – 11.9 11.3 10.8 10.1 10.6 9.8 – – 

22 – – – – 11.8 11.5 10.8 10.2 10.7 9.7 – – 

23 – – – – 11.8 11.1 10.4 9.8 11.0 10.3 – – 

24 – – – – 11.2 10.8 11.0 10.2 11.0 10.5 – – 

25 – – – – 11.1 10.7 11.3 10.8 11.1 10.6 – – 

26 – – – – 11.4 10.9 11.1 10.7 11.1 10.6 – – 

27 – – 12.2 11.6 11.0 10.6 11.1 10.6 11.2 10.5 – – 

28 – – 11.8 11.2 11.3 10.9 11.1 10.5 11.1 10.6 – – 

29 – – 12.1 11.4 11.3 11.0 10.8 10.2 11.2 10.5 – – 

30 – – 12.0 11.4 11.2 10.8 10.8 10.2 11.0 10.4 – – 

31 – – 11.7 11.0 – – 10.7 10.0 11.1 10.5 – – 

Month – – – – 12.3 10.2 11.6 9.8 11.7 9.7 – – 
Tables 23

Table 12. pH data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, 

water years 2010 and 2011.

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

pH, water, unfiltered, field, standard units, water year October 2009 to September 2010

April May June July August September

Max Min Max Min Max Min Max Min Max Min Max Min 

1 – – – – 7.6 7.4 7.8 7.6 7.3 7.2 7.5 7.4 

2 – – – – 7.6 7.5 7.8 7.6 7.4 7.3 7.5 7.4 

3 – – – – 7.5 7.5 7.8 7.6 7.4 7.2 7.5 7.4 

4 – – – – 7.6 7.5 7.8 7.6 7.3 7.3 7.5 7.4 

5 – – – – 7.5 7.4 7.8 7.6 7.3 7.3 7.4 7.3 

6 – – – – 7.6 7.5 7.8 7.6 7.3 7.2 7.4 7.3 

7 – – – – 7.6 7.5 7.8 7.6 7.3 7.2 7.4 7.3 

8 – – – – 7.6 7.5 7.8 7.6 7.3 7.2 7.4 7.3 

9 – – – – 7.6 7.4 7.8 7.6 7.3 7.2 7.4 7.3 

10 – – – – 7.6 7.5 7.8 7.6 7.4 7.3 7.4 7.4 

11 – – – – 7.6 7.5 7.7 7.6 7.3 7.3 7.4 7.4 

12 – – – – 7.6 7.5 7.8 7.6 7.3 7.2 7.5 7.4 

13 – – – – 7.6 7.5 7.7 7.6 7.3 7.2 7.5 7.4 

14 – – – – 7.6 7.5 7.8 7.6 7.3 7.2 7.5 7.4 

15 – – – – 7.6 7.4 7.8 7.6 7.3 7.3 7.5 7.4 

16 – – – – 7.6 7.4 7.8 7.6 7.3 7.3 7.5 7.4 

17 – – – – 7.6 7.5 7.8 7.5 7.4 7.2 7.5 7.4 

18 – – – – 7.7 7.5 7.7 7.5 7.3 7.3 7.5 7.4 

19 – – – – 7.8 7.6 7.7 7.5 7.4 7.3 7.5 7.4 

20 – – – – 7.8 7.6 7.6 7.5 7.4 7.3 7.5 7.4 

21 – – – – 7.8 7.6 7.6 7.5 7.4 7.3 7.6 7.5 

22 – – – – 7.8 7.6 7.6 7.4 7.4 7.3 7.6 7.5 

23 – – – – 7.9 7.6 7.6 7.5 7.4 7.3 7.6 7.5 

24 – – – – 7.8 7.6 7.6 7.5 7.4 7.3 7.6 7.5 

25 – – – – 7.8 7.6 7.6 7.5 7.4 7.4 7.6 7.5 

26 – – 7.5 7.4 7.8 7.6 7.5 7.4 7.4 7.3 7.6 7.5 

27 – – 7.5 7.4 7.8 7.6 7.4 7.3 7.4 7.4 7.6 7.5 

28 – – 7.5 7.4 7.8 7.6 7.4 7.3 7.5 7.4 7.6 7.5 

29 – – 7.5 7.4 7.8 7.6 7.4 7.3 7.4 7.4 – 7.5 

30 – – 7.5 7.4 7.8 7.6 7.4 7.3 7.5 7.4 – – 

31 – – 7.5 7.4 – – 7.3 7.2 7.5 7.4 – – 

Month – – – – 7.9 7.4 7.8 7.2 7.5 7.2 – – 
24 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

 Day 

pH, water, unfiltered, field, standard units, water year October 2010 to September 2011

April May June July August September

Max Min Max Min Max Min Max Min Max Min Max Min 

1 – – – – 7.6 7.5 7.5 7.4 7.4 7.3 7.4 7.3 

2 – – – – 7.5 7.4 7.5 7.4 7.4 7.3 7.3 7.1 

3 – – – – 7.5 7.4 7.4 7.3 7.4 7.2 7.3 7.2 

4 – – – – 7.5 7.5 7.4 7.3 7.3 7.2 7.3 7.2 

5 – – – – 7.6 7.5 7.4 7.3 7.4 7.3 7.3 7.2 

6 – – – – 7.5 7.4 7.3 7.1 7.3 7.3 7.3 7.2 

7 – – – – 7.5 7.4 7.6 7.1 7.4 7.3 7.3 7.2 

8 – – – – 7.5 7.4 7.6 7.5 7.3 7.2 7.3 7.2 

9 – – – – 7.5 7.4 7.6 7.5 7.3 7.2 7.3 7.2 

10 – – – – 7.6 7.4 7.6 7.5 7.3 7.2 7.3 7.1 

11 – – – – 7.6 7.4 7.6 7.5 7.4 7.2 7.4 7.2 

12 – – – – 7.5 7.4 7.6 7.5 7.4 7.3 7.3 7.2 

13 – – – – 7.6 7.4 7.5 7.4 7.4 7.2 7.4 7.2 

14 – – – – 7.5 7.4 7.5 7.4 7.4 7.3 7.4 7.2 

15 – – – – 7.5 7.4 7.6 7.4 7.4 7.3 7.4 7.2 

16 – – – – 7.5 7.4 7.6 7.4 7.4 7.3 7.4 7.2 

17 – – – – 7.6 7.5 7.5 7.4 7.5 7.3 7.4 7.2 

18 – – – – 7.5 7.4 7.5 7.3 7.4 7.3 7.4 7.2 

19 – – – – 7.5 7.4 7.5 7.3 7.4 7.3 7.3 7.1 

20 – – – – 7.5 7.4 7.5 7.3 7.4 7.3 7.3 7.1 

21 – – – – 7.5 7.2 7.6 7.4 7.4 7.2 7.3 7.1 

22 – – – – 7.3 7.2 7.6 7.4 7.4 7.3 7.3 7.1 

23 – – – – 7.3 7.2 7.5 7.4 7.5 7.3 7.3 7.1 

24 – – – – 7.3 7.2 7.4 7.3 7.4 7.3 7.3 7.1 

25 – – – – 7.3 7.3 7.4 7.3 7.5 7.3 7.3 7.1 

26 – – – – 7.4 7.3 7.4 7.3 7.5 7.3 7.3 7.1 

27 – – 7.6 7.5 7.4 7.3 7.5 7.3 7.5 7.3 – – 

28 – – 7.6 7.5 7.5 7.4 7.5 7.3 7.5 7.3 – – 

29 – – 7.6 7.5 7.5 7.4 7.5 7.3 7.5 7.3 – – 

30 – – 7.7 7.5 7.5 7.4 7.5 7.3 7.5 7.3 – – 

31 – – 7.6 7.5 – – 7.5 7.3 7.4 7.3 – – 

Month – – – – 7.6 7.2 7.6 7.1 7.5 7.2 – – 

Table 12. pH data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, 

water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]
Tables 25

Table 13. Specific conductance data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius,

water year October 2009 to September 2010

April May June July August September

Max Min Max Min Max Min Max Min Max Min Max Min 

1 – – – – 66 64 80 77 61 59 69 69 

2 – – – – 67 66 79 77 62 61 70 69 

3 – – – – 67 66 79 78 63 62 71 70 

4 – – – – 68 66 79 78 62 61 71 70 

5 – – – – 67 65 79 77 61 60 70 69 

6 – – – – 68 65 77 74 60 60 70 69 

7 – – – – 69 67 75 73 60 59 70 70 

8 – – – – 74 69 76 74 60 58 70 69 

9 – – – – 74 68 76 76 60 59 70 69 

10 – – – – 69 69 77 75 63 60 72 70 

11 – – – – 69 68 75 71 61 58 76 72 

12 – – – – 70 69 73 71 58 58 75 74 

13 – – – – 70 70 74 73 61 58 75 75 

14 – – – – 71 70 75 72 61 59 76 75 

15 – – – – 71 70 73 72 61 59 76 75 

16 – – – – 70 68 73 72 60 59 76 75 

17 – – – – 73 69 73 72 59 56 76 75 

18 – – – – 72 68 73 72 57 55 77 76 

19 – – – – 73 69 72 71 60 57 77 76 

20 – – – – 72 68 72 71 62 60 77 77 

21 – – – – 72 70 71 70 64 62 78 77 

22 – – – – 73 72 73 71 64 63 78 78 

23 – – – – 74 73 75 73 64 63 81 78 

24 – – – – 76 74 75 74 64 64 79 78 

25 – – – – 76 75 75 73 66 64 79 78 

26 – – 60 59 77 76 73 64 67 66 78 78 

27 – – 60 60 78 76 66 62 68 67 79 78 

28 – – 60 58 78 77 67 63 68 68 79 78 

29 – – 62 60 79 78 67 65 69 68 – 78 

30 – – 63 62 79 78 65 60 69 69 – – 

31 – – 65 63 – – 60 59 70 69 – – 

Month – – – – 79 64 80 59 70 55 – – 
26 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Day 

Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius,

water year October 2010 to September 2011

April May June July August September

Max Min Max Min Max Min Max Min Max Min Max Min 

1 – – – – 79 76 69 68 74 73 73 71 

2 – – – – 81 71 69 69 75 71 73 71 

3 – – – – 77 71 69 69 71 64 73 72 

4 – – – – 83 77 69 67 68 64 74 72 

5 – – – – 84 76 67 66 67 65 73 72 

6 – – – – 83 77 67 66 70 65 73 72 

7 – – – – 83 75 68 67 67 65 73 72 

8 – – – – 75 72 69 68 67 65 73 71 

9 – – – – 88 74 70 69 65 64 72 70 

10 – – – – 91 87 70 69 65 64 72 70 

11 – – – – 91 76 69 68 67 65 72 70 

12 – – – – 78 74 68 68 68 66 74 70 

13 – – – – 76 74 68 68 69 67 72 71 

14 – – – – 78 72 70 68 69 68 72 70 

15 – – – – 74 72 72 70 73 68 74 71 

16 – – – – 77 74 76 71 70 69 73 71 

17 – – – – 77 74 73 71 73 70 77 71 

18 – – – – 86 75 71 69 71 71 79 74 

19 – – – – 86 81 70 69 71 71 77 73 

20 – – – – 82 76 72 70 71 69 76 73 

21 – – – – 76 61 73 71 71 69 74 72 

22 – – – – 61 59 74 73 71 70 74 71 

23 – – – – 65 61 75 73 72 71 76 73 

24 – – – – 66 65 74 70 71 71 78 72 

25 – – – – 67 66 72 68 72 71 78 73 

26 – – – – 67 66 69 68 73 72 78 73 

27 – – 67 63 67 66 71 69 73 72 – – 

28 – – 70 67 67 66 73 71 74 72 – – 

29 – – 70 68 67 66 73 71 75 74 – – 

30 – – 73 70 68 67 76 72 75 74 – – 

31 – – 76 73 – – 75 72 75 73 – – 

Month – – – – 91 59 76 66 75 64 – – 

Table 13. Specific conductance data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port 

Alsworth, Alaska, water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]
Tables 27

Table 14. Turbidity data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, 

water years 2010 and 2011.

[Abbreviations: Max, maximum; Min, minimum; –, no data]

Day 

Turbidity, water, unfiltered, near Ir light-emitting diode light, 780–900 nanometers, detect angle

90 degrees formazin nephelometric units (FNU), water year October 2009 to September 2010

April May June July August September

Max Min Max Min Max Min Max Min Max Min Max Min 

1 – – – – 6.2 3.1 4.5 3.0 12 8.6 – – 

2 – – – – 4.6 3.0 5.3 3.0 12 8.5 – – 

3 – – – – 6.1 2.9 3.8 3.1 12 8.0 – – 

4 – – – – 6.2 3.3 4.1 3.2 20 8.6 13 3.9 

5 – – – – 9.9 5.2 5.0 3.2 13 9.2 8.3 3.8 

6 – – – – 14 3.6 5.5 3.4 13 8.3 6.2 3.8 

7 – – – – 6.3 3.4 5.4 3.7 11 7.4 6.1 3.9 

8 – – – – 5.4 3.5 5.7 3.7 10 7.1 8.8 4.1 

9 – – – – 7.1 3.9 5.6 4.1 11 6.8 7.9 4.8 

10 – – – – 6.9 3.4 5.8 4.1 9.9 7.9 6.2 3.9 

11 – – – – 5.0 3.0 11 4.5 40 8.1 5.1 3.0 

12 – – – – 5.2 2.8 9.3 5.2 48 10 3.6 2.3 

13 – – – – 5.2 3.0 6.6 5.2 16 8.8 3.0 2.3 

14 – – – – 11 3.1 8.4 5.6 17 7.3 3.9 2.2 

15 – – – – 7.2 3.3 9.1 5.9 20 7.5 4.3 1.7 

16 – – – – 8.4 3.9 8.6 6.2 25 11 2.8 1.5 

17 – – – – 8.0 5.7 9.6 5.9 – 10 2.4 1.5 

18 – – – – 9.2 5.9 8.7 5.8 – – 2.3 1.0 

19 – – – – 7.4 5.4 8.8 5.9 – – 3.2 0.8 

20 – – – – 9.3 5.8 10 5.9 – – 3.0 0.7 

21 – – – – 7.2 4.8 12 7.9 – – 2.4 0.6 

22 – – – – 8.0 3.9 8.9 5.1 – – 2.4 0.9 

23 – – – – 5.2 3.3 6.7 4.4 – – 3.2 1.3 

24 – – – – 5.1 3.5 8.2 4.7 – – 4.2 1.5 

25 – – – – 5.2 3.2 7.3 4.9 – – 2.8 1.3 

26 – – 5.2 3.8 4.5 2.8 23 5.3 – – 4.2 2.3 

27 – – 4.6 3.3 3.8 2.7 20 10 – – 7.0 3.8 

28 – – 5.1 3.6 4.8 2.8 11 7.1 – – 12 6.5 

29 – – 5.4 3.8 4.2 2.9 10 6.8 – – – – 

30 – – 5.4 3.6 4.3 2.9 15 7.8 – – – – 

31 – – 5.8 3.1 – – 17 9.7 – – – – 

Month – – – – 14 2.7 23 3.0 – – – – 
28 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

Day 

Turbidity, water, unfiltered, near Ir light-emitting diode light, 780–900 nanometers, detect angle

90 degrees formazin nephelometric units (FNU), water year October 2010 to September 2011

April May June July August September

Max Min Max Min Max Min Max Min Max Min Max Min 

1 – – – – 18 1.8 10 4.1 23 15 1.7 <1.0 

2 – – – – 28 6.0 29 3.4 30 22 5.9 <1.0 

3 – – – – 7.9 2.3 9.9 3.4 – – 1.3 <1.0 

4 – – – – 8.6 0.4 11 3.7 – – 1.9 <1.0 

5 – – – – 16 8.0 8.5 4.2 – – 0.8 <1.0 

6 – – – – 12 7.9 12 4.3 – – 2.7 <1.0 

7 – – – – 19 4.6 23 4.8 – – 4.1 <1.0 

8 – – – – 7.9 4.8 17 4.9 – – 3.0 <1.0 

9 – – – – 16 5.3 12 3.4 – – 9.0 0.2 

10 – – – – 15 4.8 19 3.9 – – 2.8 0.7 

11 – – – – 8.3 4.1 13 5.3 – – 4.1 0.1 

12 – – – – 12 5.0 7.5 5.4 – – 1.3 <1.0 

13 – – – – 8.9 5.3 7.9 2.8 – – 6.7 0.7 

14 – – – – 9.5 3.9 6.3 2.8 – – 2.7 0.5 

15 – – – – 12 2.3 4.0 2.5 – – 3.1 1.0 

16 – – – – 6.7 1.5 6.7 2.4 – – 7.2 1.6 

17 – – – – 3.4 0.7 5.5 1.9 – – 4.7 1.4 

18 – – – – 9.2 1.3 7.7 1.5 – – 3.9 0.7 

19 – – – – 3.4 0.8 11 1.1 – – 1.7 0.1 

20 – – – – 9.8 1.4 5.3 1.0 – – 1.2 <1.0 

21 – – – – 44 8.7 2.8 0.6 – – 7.2 <1.0 

22 – – – – 23 8.7 2.9 0.8 – – 11 <1.0 

23 – – – – 26 6.7 7.0 2.1 – – 5.7 <1.0 

24 – – – – 21 7.0 8.6 3.9 e2.0 <1.0 1.0 <1.0 

25 – – – – 18 7.7 13 6.1 0.7 <1.0 0.9 <1.0 

26 – – – – 14 6.4 12 3.0 0.4 <1.0 1.0 <1.0 

27 – – 12 5.3 11 5.4 14 6.7 1.3 <1.0 – – 

28 – – 7.3 4.1 25 5.9 16 7.2 2.2 <1.0 – – 

29 – – 6.2 1.7 11 7.1 18 11 0.4 <1.0 – – 

30 – – 5.9 1.6 17 5.6 19 3.2 1.7 <1.0 – – 

31 – – 8.7 1.8 – – 18 11 0.9 <1.0 – – 

Month – – – – 44 0.4 29 0.6 – – – – 

Table 14. Turbidity data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Port Alsworth, Alaska, 

water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; –, no data]
Tables 29

Table 15. Discharge data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Point Alsworth, 

Alaska, water years 2010 and 2011.

[Abbreviations: Max, maximum; Min, minimum; e, estimated; Acre-ft, acre-foot; Cfsm, cubic foot per second per square mile; In., inch]

 Day 

Discharge, cubic feet per second,

water year October 2009 to September 2010 daily mean values

Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept. 

1 e1,400 e1,250 e600 e430 e280 e280 e270 e1,900 1,860 1,090 4,030 3,270 

2 e1,350 e1,230 e570 e420 e280 e280 e270 e2,200 1,820 1,070 3,850 3,060 

3 e1,300 e1,230 e560 e420 e270 e280 e270 e2,500 1,760 1,090 3,720 2,920 

4 e1,320 e1,220 e550 e420 e270 e280 e270 e2,800 1,930 1,150 3,700 2,940 

5 e1,380 e1,200 e540 e420 e270 e270 e270 e4,200 2,060 1,180 3,800 3,180 

6 e1,410 e1,160 e540 e430 e270 e270 e260 3,610 1,890 1,510 3,990 3,090 

7 e1,500 e1,100 e540 e430 e270 e270 e260 3,320 1,800 1,520 4,460 3,200 

8 1,880 e1,050 e530 e420 e260 e270 e260 3,180 1,740 1,510 4,740 3,590 

9 2,700 e1,000 e530 e420 e260 e270 e260 3,120 1,720 1,460 4,600 4,150 

10 2,270 e1,000 e520 e410 e260 e260 e260 3,080 1,790 1,450 4,580 3,980 

11 2,140 e980 e510 e410 e260 e260 e270 2,950 1,730 1,880 5,550 3,810 

12 2,260 e950 e500 e400 e260 e260 e270 2,880 1,690 1,940 5,970 3,640 

13 2,270 e920 e490 e390 e270 e260 e270 2,870 1,690 1,840 5,710 3,470 

14 2,190 e890 e480 e380 e270 e260 e270 2,750 1,600 1,910 5,310 3,300 

15 2,150 e850 e470 e370 e280 e260 e270 2,620 1,650 1,890 4,990 3,160 

16 2,100 e810 e460 e360 e280 e260 e270 2,610 1,700 1,830 5,110 3,010 

17 2,030 e780 e450 e350 e290 e250 e270 2,510 1,670 1,760 5,470 2,870 

18 1,960 e760 e440 e340 e290 e260 e290 2,410 1,640 1,740 5,900 2,740 

19 1,900 e740 e430 e330 e290 e260 e320 2,310 1,570 1,810 5,450 2,620 

20 1,840 e720 e420 e320 e300 e270 e340 2,430 1,570 1,910 5,080 2,500 

21 1,790 e700 e410 e310 e300 e270 e360 2,660 1,520 2,660 4,780 2,400 

22 1,730 e690 e410 e300 e300 e270 e390 2,520 1,450 2,560 4,530 2,300 

23 1,710 e680 e410 e300 e290 e280 e420 2,360 1,380 2,470 4,330 2,230 

24 1,770 e670 e420 e300 e290 e280 e460 2,280 1,340 2,590 4,050 2,150 

25 1,840 e650 e420 e290 e290 e280 e550 2,230 1,300 2,680 3,790 2,070 

26 1,780 e640 e430 e290 e290 e280 e650 2,200 1,280 3,370 3,560 1,980 

27 1,740 e630 e430 e290 e290 e280 e820 2,190 1,250 3,800 3,470 1,900 

28 1,620 e620 e440 e280 e280 e280 e1,000 2,150 1,230 3,560 3,510 1,830 

29 e1,500 e610 e440 e280 – e270 e1,250 2,080 1,190 3,590 3,390 1,820 

30 e1,400 e600 e440 e280 – e270 e1,570 2,050 1,140 4,020 3,210 1,930 

31 e1,320 – e430 e280 – e270 – 1,960 – 4,280 3,210 – 

Total 55,550 26,330 14,810 11,070 7,810 8,360 12,960 80,930 47,960 67,120 137,840 85,110 

Mean 1,792 878 478 357 279 270 432 2,611 1,599 2,165 4,446 2,837 

Max 2,700 1,250 600 430 300 280 1,570 4,200 2,060 4,280 5,970 4,150 

Min 1,300 600 410 280 260 250 260 1,900 1,140 1,070 3,210 1,820 

Acre-ft 110,200 52,230 29,380 21,960 15,490 16,580 25,710 160,500 95,130 133,100 273,400 168,800 

Cfsm 1.60 0.78 0.43 0.32 0.25 0.24 0.39 2.33 1.43 1.93 3.97 2.53

In. 1.85 0.87 0.49 0.37 0.26 0.28 0.43 2.69 1.59 2.23 4.58 2.83
30 Water-Quality and Flow Data , Chulitna River Basin, Southwest Alaska, October 2009–June 2012

 Day 

Discharge, cubic feet per second,

water year October 2010 to September 2011 daily mean values

Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept.

1 2,040 e1,400 e690 e405 e365 e335 e340 e3,900 2,880 2,580 2,700 3,280 

2 2,050 e1,380 e680 e410 e360 e335 e340 e4,650 3,290 2,510 2,890 3,130 

3 2,150 e1,360 e670 e415 e360 e335 e340 4,090 2,880 2,560 3,750 3,170 

4 2,240 e1,300 e660 e415 e355 e335 e345 3,930 2,700 2,810 3,710 3,220 

5 2,270 e1,200 e640 e420 e355 e335 e345 3,800 2,640 2,870 4,070 3,160 

6 2,190 e1,100 e630 e420 e355 e330 e345 3,730 2,580 2,630 3,960 3,080 

7 2,120 e1,020 e610 e415 e360 e330 e345 3,630 2,500 2,470 4,160 3,030 

8 2,060 e950 e590 e415 e360 e330 e345 3,440 2,490 2,360 4,200 3,040 

9 2,020 e900 e580 e405 e365 e330 e350 3,390 2,450 2,240 4,550 3,000 

10 1,960 e870 e570 e400 e365 e330 e350 3,400 2,340 2,280 4,710 2,910 

11 1,890 e860 e565 e400 e360 e330 e345 3,180 2,200 2,280 4,440 2,820 

12 1,820 e850 e560 e395 e360 e325 e345 2,960 2,140 2,460 4,260 2,720 

13 1,760 e840 e550 e395 e355 e325 e345 2,890 2,080 2,560 4,300 2,630 

14 1,640 e820 e545 e390 e355 e325 e345 2,850 2,060 2,410 4,070 2,530 

15 e1,620 e800 e540 e390 e350 e325 e350 2,690 2,000 2,340 3,840 2,430 

16 1,610 e790 e530 e385 e350 e325 e355 2,650 1,920 2,280 3,640 2,380 

17 1,580 e780 e520 e385 e350 e325 e360 2,530 1,830 2,250 3,450 2,330 

18 1,620 e770 e500 e380 e350 e325 e365 2,480 1,760 2,660 3,290 2,280 

19 1,580 e760 e490 e380 e350 e325 e385 2,540 1,710 2,550 3,230 2,210 

20 1,530 e750 e480 e375 e345 e330 e400 2,550 2,220 2,370 3,610 2,160 

21 1,490 e740 e465 e375 e345 e330 e450 2,490 3,940 2,290 3,520 2,180 

22 1,450 e740 e460 e370 e345 e330 e500 2,500 4,060 2,260 3,360 2,180 

23 1,470 e750 e455 e370 e345 e330 e560 2,470 3,710 2,230 3,330 2,130 

24 1,470 e770 e445 e370 e340 e335 e700 2,410 3,440 2,690 3,220 2,100 

25 1,470 e760 e430 e375 e340 e335 e1,200 2,280 3,280 2,970 3,090 2,050 

26 1,440 e750 e425 e370 e340 e340 e2,500 2,360 3,170 3,030 2,990 2,010 

27 1,390 e740 e410 e370 e340 e340 e4,400 2,390 2,990 2,930 2,890 1,970 

28 1,500 e730 e405 e365 e340 e340 e4,200 2,440 2,950 2,900 2,820 1,910 

29 1,590 e720 e405 e370 – e345 e3,900 2,460 2,880 3,000 2,710 1,850 

30 1,540 e700 e400 e370 – e345 e3,750 2,460 2,720 2,860 2,650 1,790 

31 e1,460 – e400 e365 – e345 – 2,560 – 2,730 2,950 – 

Total 54,020 26,900 16,300 12,065 9,860 10,300 29,200 92,100 79,810 79,360 110,360 75,680 

Mean 1,743 897 526 389 352 332 973 2,971 2,660 2,560 3,560 2,523 

Max 2,270 1,400 690 420 365 345 4,400 4,650 4,060 3,030 4,710 3,280 

Min 1,390 700 400 365 340 325 340 2,280 1,710 2,230 2,650 1,790 

Acre-ft 107,100 53,360 32,330 23,930 19,560 20,430 57,920 182,700 158,300 157,400 218,900 150,100 

Cfsm 1.56 0.80 0.47 0.35 0.31 0.30 0.87 2.65 2.38 2.29 3.18 2.25 

In. 1.79 0.89 0.54 0.40 0.33 0.34 0.97 3.06 2.65 2.64 3.67 2.51 

Table 15. Discharge data for USGS streamflow-gaging station 15298040, Chulitna River 5 miles above mouth, near Point Alsworth, 

Alaska, water years 2010 and 2011.—Continued

[Abbreviations: Max, maximum; Min, minimum; e, estimated; Acre-ft, acre-foot; Cfsm, cubic foot per second per square mile; In., inch]
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Publishing Network, Tacoma Publishing Service Center

For more information concerning the research in this 

report, contact the

 Director, Alaska Science Center

U.S. Geological Survey

4210 University Dr.

Anchorage, Alaska 99508-4560

http://alaska.usgs.gov
Brabets— Water-Quality and Flow Data, Chulitna River Basin, Southwest Alaska, October 2009–June 2012—Open-File Report 2013–1009