| Abstract: | In 1991, a water-quality investigation of the upper Snake River Basin was initiated as part of the U.S. Geological Survey‘s (USGS) National Water-Quality Assessment Program. Nearly 9,000 analyses of nutrients and suspended sediment from more than 450 stations were retrieved from data bases for retro- spective analysis. Few pesticide data were available. Data indicate that nitrite plus nitrate and total phosphorus concentrations are largest at the mouths of drainage basins tributary to the Snake River. Statistical analysis indicated that concen- trations of most nutrient species were significantly larger (p<O.05) at agriculturally affected stations than at unaffected and main-stem stations. Main-stem stations also had significantly larger concen- trations of most nutrient species compared with unaffected stations. Significant seasonal differences in nutrient concentrations also were noted. Sufficient data for assessment of suspended sediment were available for only six stations. A direct positive relation exists between suspended sediment concentration and streamflow; concentra- tions are largest in April, May, and June. Bottom sediment collected near the mouth of the Henrys Fork during the late 1970‘s had the largest concentra- tions of pesticides in the basin; DDD, DDE, and DDT concentrations exceeded 10 micrograms per kilogram. Mass movement of nutrients and suspended sediment in the upper Snake River Basin is controlled primarily by changes in streamflow. Between two and three times as much total nitrogen, total phos- phorus, and suspended sediment were transported out of the basin in water year 1984 (high-flow year), compared with water year 1989 (low-flow year). |
| Genre: | USGS Numbered Series |
| ProdID: | 26589 |
| Citation Author: | Clark, G. M. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | v, 49 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
USGS Earth Science Information Center, Open-File Reports Section [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 93-4229 |
| Citation Search Results Text: | Assessment of selected constituents in surface water of the upper Snake River basin, Idaho and western Wyoming, water years 1975-89; 1994; WRI; 93-4229; Clark, G. M. |
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| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Assessment of selected constituents in surface water of the upper Snake River basin, Idaho and western Wyoming, water years 1975-89; 1994; WRI; 93-4229; Clark, G. M. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1993/4229/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1993/4229/report.pdf |
| Date Other: | Wed, 1 Mar 1995 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
USGS Earth Science Information Center, Open-File Reports Section [distributor], |
