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U.S. Fish & Wildlife Service National Fish Passage Program: Truckee River

The Numana Diversion Dam was constructed in 1971 to divert Truckee River water for agricultural purposes to the Pyramid Lake Paiute Tribe Reservation. The dam is located about 12 miles upstream from the Pyramid Lake shoreline. The dam is a lowhead diversion and includes a fish ladder on the east abutment. On the opposite side of the river, water is diverted through a headgate and is filtered through three electrical powered revolving screens. This screen system is designed to prevent entrainment of adult fish and debris into the irrigation system, and conveys fish back to the river via a culvert. The fish ladder and screens were retrofitted in 1976 to facilitate fish passage. By 2000, the screens were badly corroded and not functional.

Project Status: In 2001, the Service partnered with the Bureau of Reclamation to assess the integrity of the screens. The structural frameworks of the screens were found corroded beyond repair and it was recommended to rebuild the screen system with stainless steel rather than high carbon steel. Currently, funds have been expended to replace a hoist, cables, and the trolley framework, and bids are being circulated to estimate the cost for complete renovation.

Benefits: Renovating the fish screens will maintain the endangered cui-ui lakesucker and threatened Lahontan cutthroat trout within 24 miles of its native habitat.

Wikipedia: Lahontan Cutthroat Trout

Lahontan cutthroat trout (Oncorhynchus clarki henshawi) is the largest cutthroat trout subspecies, and the state fish of Nevada. It is native to the drainages of the Truckee River, Humboldt River, Carson River, Walker River, Quinn River and several smaller rivers in the Great Basin of North America. Irrigation developments along these rivers have severely disrupted its habitat. It was classified as an endangered species between 1970 and 1975, and is currently listed as a threatened species.

Pyramid Lake Fisheries

Pyramid Lake, famous for its Lahontan cutthroat trout (LCT) fishery, is located about 35 miles northeast of Reno on the Pyramid Lake Paiute Indian Reservation. Pyramid Lake covers approximately 112,000 acres on land and is 350 feet at its deepest point. Pyramid is a "high desert" lake (elevation 3,817 feet), and after travelling through the desert to its end, the water is about 1/6 as salty as sea water.

Pyramid Lake contains two fish species on the federal threatened & endangered species list: the Lahontan Cutthroad Trout, and the ancient Cui-ui. The lake is flanked on the east and west by rugged mountain ranges, and around the lake shore there are many large "tufa" rock formations (formed by calcium carbonate deposits).

The Tribe's interesting wildlife website is accessible at:

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