WaterQuality Study of a Reach of the Merced River in Yosemite National Park and Vicinity, California April 1973 Through September 1974 Classic Reprint

Excerpt from Water-Quality Study of a Reach of the Merced River in Yosemite National Park and Vicinity, California: April 1973 Through September 1974

The Merced River, in and near Yosemite National Park (fig. 1) is a prime scenic attraction. Each summer, vacationers are attracted to the river and its environs in Yosemite Valley. In addition to having esthetic appeal, the Merced River is used for fishing and swimming; water from the river is used for power generation, and for the park water supply. Since 1931, a sewage treatment plant near Yosemite Village (no. 6 in fig. 1) has discharged effluent into the river.

During l975~76, the National Park Service plans to construct a new sewage-treatment plant (secondary treatment with phosphorus removal) near the Merced River about 2 mi km) downstream from the western park boundary. Effluent from the new treatment plant will be discharged into the Merced River downstream from El Portal (fig.

Although contamination of the Merced River from the new treatment plant is not anticipated, the California Regional Water Quality Control Board Central Valley Region, has required the National Park Service to insure that water-quality standards in the river are not violated. To evaluate subsequent changes, water-quality data are needed prior to operation of the treatment plant. To provide this water - quality base data, the National Park Service requested in 1973 that the u.s. Geological Survey start a water-quality study at sites upstream and downstream from the proposed sewage outfall. Fieldwork began in April 1973 and ended in September 1974.

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