| Abstract: | A 25-mile reach of the Merced River was studied to provide the U.S. National Park Service with water-quality data prior to the operation of a new sewage treatment plant. Water-quality variables investigated were discharge, temperature, major chemical constituents, selected trace metals, specific conductance, suspended sediment, turbidity, dissolved oxygen, pH , total alkalinity, carbon dioxide, total organic carbon, nitrogen, phosphorus, algal growth potential, coliform bacteria, periphyton, and benthic invertebrates. Results indicate that water in the reach of the Merced River studied is a dilute system of good quality. Mean concentrations of nitrogen and phosphorus were highest in the Merced River at Rancheria Flat. Algal growth potential tests revealed that phosphorus was limiting algal growth at Happy Isles Bridge, El Capitan Bridge, and South Fork Merced River, which nitrogen was limiting it at Rancheria Flat. Input of excessive nitrogen and phosphorus concentrations in the Merced River during the summer low-flow period, and mixing with warm tributary inflow could cause excessive algal growth and production. (Woodard-USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 19376 |
| Citation Author: | Hoffman, Ray J.; Dong, Alex E.; Keeter, Gail L. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | - |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | iv, 66 p. :ill. ;27 cm.; (74 p. - PGS) |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | Dept. of the Interior, Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 76-326 |
| Citation Search Results Text: | Water-quality study of a reach of the Merced River in Yosemite National Park and vicinity, California, April 1973 through September 1974; 1976; OFR; 76-326; Hoffman, Ray J.; Dong, Alex E.; Keeter, Gail L. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 1976 |
| Type: | citation/reference |
| Text: | Water-quality study of a reach of the Merced River in Yosemite National Park and vicinity, California, April 1973 through September 1974; 1976; OFR; 76-326; Hoffman, Ray J.; Dong, Alex E.; Keeter, Gail L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | Dept. of the Interior, Geological Survey, |
