Cottage Grove Dam
Dam in Lane County, Oregon · Coast Fork Willamette River · forms Cottage Grove Lake
Height
103 ft
31 m (NID height)
Length
2,110 ft
643 m
Completed
1942
Cottage Grove Lake today
755.11 ft
7 days ▼ 3.58 ft
vs full pool
▼ 34.89 ft
Normal storage
33,000 acre-ft
Below normal for the date
Reservoir level measured Oct 23, 2026, 12:10 PM PDT. Full level page →
Facts
- Purposes
- Flood Risk Reduction; Other; Irrigation; Navigation; Recreation
- Dam type
- Earth
- Structural height
- 103 ft
- Owner
- USACE - Portland District (Federal)
- Maximum storage
- 50,000 acre-ft
- Surface area
- 1,158 acres
- Hydraulic height
- 76 ft
- Drainage area
- 104 sq mi
- Spillway
- Uncontrolled, 264 ft wide
- Army Corps district
- Portland District
- Also known as
- Cottage Grove Lake
- NID ID
- OR00005
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 5, 2026. Search NID ID OR00005 at nid.sec.usace.army.mil. Project website.