The Dorena Reservoir project is on the Row River about six miles east of Cottage Grove
. Dorena Dam is an earthfill structure with a concrete spillway, impounding 72,000 acre-feet of water. The project was completed in 1949 at a cost of $14 million.
The lake behind the dam is in rolling, partially wooded hill country. Three parks offer boating, swimming, sailing, fishing and water skiing. Schwartz Park, located immediately downstream from the dam, offers overnight camping for families and groups. Overnight camping is also available in Baker Bay Park on the south side of the lake.
Guided tours are available from the Corps office at Cottage Grove Lake.