New Bullards Bar Reservoir
From Wikipedia, the free encyclopedia
| New Bullards Bar Reservoir | |
|---|---|
| Location | Yuba County, California |
| Lake type | reservoir |
| Basin countries | United States |
| Max. length | 16 mi (26 km) |
| Water volume | 969,600 acre-foot (1.20 km³) |
| Shore length1 | 56 mi (90 km) |
| Surface elevation | 2,000 ft (610 m) |
| Settlements | Dobbins |
| 1 Shore length is not a well-defined measure. | |
New Bullards Bar Reservoir is a large reservoir in northeastern Yuba County, California, at an elevation of 2,000 feet (610 m) in the Tahoe National Forest and about 30 miles (50 km) northeast of Yuba City, California. The 969,600 acre-foot (1.196 km³) reservoir is formed by New Bullards Bar Dam on the North Fork of the Yuba River, a tributary of the Sacramento River. It also receives a portion of the Middle Fork's flow that is diverted to the reservoir via tunnels.
The dam is a 635-foot (194 m) high concrete variable radius arch dam. It was finished in 1970 and is owned by the Yuba County Water Agency. It is a multipurpose dam, but its most important function is flood control, which 170,000 acre-feet (0.21 km³) of the reservoir's capacity is dedicated to. While this is only 17.5% of the reservoir's total capacity, it is enough to create a medium-sized reservoir by itself. The dam also provides water for irrigation, hydroelectricity production and recreation, including boating, water skiing, fishing and camping.
The reservoir provides water to power two hydroelectric plants, New Colgate Powerhouse and Fish Release Powerhouse. New Colgate Powerhouse is not located at the base of the dam, like most hydroelectric plants. Instead, the 14-foot (4.3 m) diameter New Colgate Tunnel carries the water about 5 miles (8 km) southwest of the dam to the powerhouse. This increases the head, which allows the plant to produce more electricity. The dam's Pelton wheels are the largest ever built and have a combined capacity of 315 MW. Some water is released at the base of the dam so that the streambed is not completely dewatered upstream of the New Colgate Powerhouse tailrace. This water powers the 150 kW Fish Release Powerhouse. In the event of a power outage, this plant can operate the dam's massive spillway gates.
