Cottage Grove Dam and Reservoir
Cottage Grove Lake Project, on the Coast Fork of the Willamette River about 5 miles south of Cottage Grove, is one of 13 multi-purpose water projects operated by the Corps of Engineers in the Willamette Valley. Cottage Grove dam provides flood control, irrigation, navigation, improved downstream water quality, and water-related recreation opportunities. To learn more about recreation at Cottage Grove Lake, click here.
Cottage Grove dam, an earthfill dam with a concrete spillway, impounds 33,000 acre-feet of water at full pool. The dam was completed in 1942 at a cost of $3.3 million.
PROJECT DATA
| Dam | Measure | Metric | |
| Length | 1,750ft | 533.4m | |
| Height | 95ft | 29m | |
| Elevation (NGVD*) | 808ft | 246.3m | |
| Lake | |||
| Length | 3mi | 4.8km | |
| Area when full | 1,156ac | 486.6ha |
*National Geodetic Vertical Datum (Mean Sea Level)