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Cottage Grove Lake facts for kids

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Cottage Grove Lake
View upstream of a grass-covered dam impounding a lake
Cottage Grove Dam and Lake
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Location Lane County, Oregon, United States
Coordinates 43°42′55″N 123°03′02″W / 43.71528°N 123.05056°W / 43.71528; -123.05056
Type Mesotrophic reservoir
Primary inflows Coast Fork Willamette River
Primary outflows Coast Fork Willamette River
Catchment area 106 square miles (270 km2)
Basin countries United States
Managing agency U.S. Army Corps of Engineers
Max. length 3 miles (4.8 km)
Surface area 1,025.9 acres (415.2 ha)
Average depth 29 feet (8.8 m)
Max. depth 73 feet (22 m)
Water volume 33,000 acre feet (41,000,000 m3)
Residence time 2 months
Shore length1 10.6 miles (17.1 km)
Surface elevation 794 feet (242 m)
1 Shore length is not a well-defined measure.

Cottage Grove Lake is a reservoir on the Coast Fork Willamette River in Lane County, Oregon, United States. The lake is about 3 miles (4.8 km) long.

Cottage Grove Dam, which impounds the lake, is 1,750 feet (530 m) long and 95 feet (29 m) high. It was completed in 1942 as one of the 13 dams built by the United States Army Corps of Engineers in the Willamette River basin. It is about 5 miles (8 km) south of Cottage Grove at river mile 29 (kilometer 47).

The dam's main function, in conjunction with the Dorena Dam on the Row River, a Coast Willamette tributary, is flood control. Other functions are to supply water for irrigation and improved river navigation. The lake and its surrounds are used for recreation, including boating, camping, fishing, picnicking, and bird-watching.

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