Scientific Investigations Report 2006-5073
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5073
Table 3. Field measurements and concentrations of major ions, nutrients, organic carbon, suspended sediment, and nitrogen isotope of nitrate (δ15N) collected at Skokomish River sampling sites during summer base-flow conditions, southern part of Hood Canal, Mason and Kitsap Counties, Washington, July and August 2004.
[Locations of sampling sites are shown in figure 1. Abbreviations: USGS, U.S. Geological Survey; CaCO3; calcium carbonate; HCO3, bicarbonate; N, nitrogen; P, phosphorus; δ15N, isotope fractionation of nitrogen (see equation 1). ft3/s, cubic foot per second; mg/L, milligram per liter; µg/L, microgram per liter; µS/cm, microsiemen per centimeter at 25°C; °C, degrees Celsius; e, estimated value; <, less than; –, not available]
| Map No. | USGS site No. | Sample date |
Distance from mouth (miles) |
Discharge, instantaneous (ft3/s) |
Dissolved oxygen (mg/L) |
pH (standard units) |
Specific conductance (µS/cm) |
Water temperature (°C) |
Calcium (mg/L) |
Magnesium (mg/L) |
|
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mainstem and North Fork | |||||||||||
| S1 | 12062515 | 07-09-04 | 0.65 | 396 | 10.3 | 7.4 | 82 | 10.8 | 9.09 | 2.50 | |
| S2 | 12062510 | 07-09-04 | 1.4 | 376 | 10.9 | 7.7 | 77 | 11.2 | 8.64 | 2.36 | |
| S3 | 12061500 | 07-09-04 | 4.4 | 323 | 10.8 | 7.7 | 75 | 12.7 | 8.78 | 2.17 | |
| S4a | 12059500 | 07-12-04 | 9.4 | 72 | 11.3 | 7.5 | 66 | 12.7 | 8.45 | 1.35 | |
| S5 | 12058800 | 08-04-04 | 15.9 | 64 | 10.6 | 7.5 | 63 | 11.1 | 9.42 | 1.03 | |
| S6 | 12056500 | 07-15-04 | 28.9 | 162 | 10.8 | 8.0 | 87 | 11.7 | 14.2 | .925 | |
| Unnamed Creek at Purdy-Cutoff Road | |||||||||||
| S2b | 12062508 | 08-04-04 | 2 | .84 | 11.2 | 7.6 | 112 | 9.8 | 11.6 | 5.31 | |
| South Fork | |||||||||||
| S4b | 12060500 | 07-12-04 | 11.5 | 124 | 10.7 | 7.5 | 76 | 13.1 | 10.2 | 1.83 | |
| Map No. | USGS site No. | Sample date |
Potassium (mg/L) |
Sodium (mg/L) |
Alkalinity (mg/L as CaCO3) |
Bicarbonate (mg/L as HCO3) |
Bromide (mg/L) |
Chloride (mg/L) |
Fluoride (mg/L) |
Silica (mg/L) |
|---|---|---|---|---|---|---|---|---|---|---|
| Mainstem and North Fork | ||||||||||
| S1 | 12062515 | 07-09-04 | 0.16 | 2.90 | 36 | 45 | <0.02 | 2.34 | <0.2 | 14.6 |
| S2 | 12062510 | 07-09-04 | e.14 | 2.43 | 36 | 44 | e.01 | 1.76 | <.2 | 14.6 |
| S3 | 12061500 | 07-09-04 | e.15 | 2.24 | 34 | 42 | e.01 | 1.72 | <.2 | 13.4 |
| S4a | 12059500 | 07-12-04 | e.13 | 1.97 | 27 | 32 | <.02 | 1.22 | <.2 | 8.83 |
| S5 | 12058800 | 08-04-04 | e.10 | 1.40 | 28 | 34 | <.02 | .88 | <.2 | 5.84 |
| S6 | 12056500 | 07-15-04 | .18 | 1.78 | 35 | 43 | <.02 | .73 | <.2 | 5.5 |
| Unnamed Creek at Purdy-Cutoff Road | ||||||||||
| S2b | 12062508 | 08-04-04 | .41 | 3.04 | 51 | 62 | <.02 | 3.06 | <.2 | 19.9 |
| South Fork | ||||||||||
| S4b | 12060500 | 07-12-04 | e.15 | 2.17 | 32 | 38 | <.02 | 2.35 | <.2 | 10.5 |
| Map No. | USGS site No. | Sample date |
Sulfate (mg/L) |
Dissolved solids (mg/L) |
Ammonia (mg/L as N) |
Nitrate plus nitrite (mg/L as N) |
Particulate-N (mg/L) |
Orthophosphate (mg/L as P) |
Total nitrogen (mg/L) |
Total carbon, particulate (mg/L) |
|
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mainstem and North Fork | |||||||||||
| S1 | 12062515 | 07-09-04 | 1.6 | 56 | <0.04 | <0.06 | 0.02 | <0.02 | 0.03 | <0.1 | |
| S2 | 12062510 | 07-09-04 | 1.5 | 56 | <.04 | E.03 | .03 | <.02 | .04 | .2 | |
| S3 | 12061500 | 07-09-04 | 1.6 | 62 | <.04 | <.06 | <.02 | <.02 | <.03 | .1 | |
| S4a | 12059500 | 07-12-04 | 3.0 | 44 | <.04 | <.06 | <.02 | <.02 | .06 | <.1 | |
| S5 | 12058800 | 08-04-04 | 3.5 | 35 | <.04 | <.06 | .04 | <.02 | <.03 | .3 | |
| S6 | 12056500 | 07-15-04 | 6.3 | 61 | <.04 | <.06 | <.02 | <.006 | 1.03 | <.1 | |
| Unnamed Creek at Purdy-Cutoff Road | |||||||||||
| S2b | 12062508 | 08-04-04 | 1.4 | 78 | <.04 | .49 | .14 | .02 | .52 | 3.1 | |
| South Fork | |||||||||||
| S4b | 12060500 | 07-12-04 | 2.0 | 50 | <.04 | <.06 | <.02 | <.02 | .09 | <.1 | |
| Map No. | USGS site No. | Sample date |
Inorganic carbon, particulate (mg/L) |
Organic carbon, particulate (mg/L) |
Organic carbon, dissolved (mg/L) |
Iron (µg/L) |
Manganese (µg/L) |
Suspended sediment (mg/L) |
δ15N (per mil) |
|---|---|---|---|---|---|---|---|---|---|
| Mainstem and North Fork | |||||||||
| S1 | 12062515 | 07-09-04 | <0.1 | <0.1 | 0.6 | 21 | 28.1 | <0.5 | 23.13 |
| S2 | 12062510 | 07-09-04 | <.1 | .2 | .7 | 20 | 16.8 | 1 | 5.43 |
| S3 | 12061500 | 07-09-04 | <.1 | .1 | .5 | 11 | 4.0 | <.5 | 21.39 |
| S4a | 12059500 | 07-12-04 | <.1 | <.1 | .7 | e5 | 1.4 | 2 | 21.09 |
| S5 | 12058800 | 08-04-04 | <.1 | .3 | .7 | <6 | e.5 | 4 | – |
| S6 | 12056500 | 07-15-04 | <.1 | <.1 | .4 | <6 | <.8 | 1 | 2-.78 |
| Unnamed Creek at Purdy-Cutoff Road | |||||||||
| S2b | 12062508 | 08-04-04 | <.1 | 3.1 | .3 | <6 | e.6 | 6 | – |
| South Fork | |||||||||
| S4b | 12060500 | 07-12-04 | <.1 | <.1 | .7 | <6 | <.8 | <.5 | 29.60 |
1Resulting concentration from an unfiltered sample.
2Data values are highly uncertain.
For more information about USGS activities in Washington, visit the USGS Washington Water Science Center home page.
U.S.
Department of the Interior | U.S. Geological
Survey
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