| Cottage Grove Lake | |
| Location: | Lane County, Oregon, United States |
| Coordinates: | 43.7153°N -123.0506°W |
| Type: | Mesotrophic reservoir |
| Inflow: | Coast Fork Willamette River |
| Outflow: | Coast Fork Willamette River |
| Basin Countries: | United States |
| Agency: | U.S. Army Corps of Engineers |
| Residence Time: | 2 months |
| Pushpin Map: | Oregon#USA |
| Pushpin Label Position: | bottom |
| Pushpin Map Alt: | Cottage Grove Lake is in west-central Oregon |
| Pushpin Map Caption: | Location of Cottage Grove Lake in Oregon |
Cottage Grove Lake is a reservoir on the Coast Fork Willamette River in Lane County, Oregon, United States.[1] The lake is about long.[2]
Cottage Grove Dam, which impounds the lake, is long and high.[2] 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.[1] It is about 5miles south of Cottage Grove at river mile 29 (kilometer 47).[2]
The dam's main function, in conjunction with the Dorena Dam on the Row River, a Coast Willamette tributary, is flood control.[1] Other functions are to supply water for irrigation and improved river navigation.[2] The lake and its surrounds are used for recreation, including boating, camping, fishing, picnicking, and bird-watching.[2]