Oregon Dams
856 dams tracked by the National Inventory of Dams
Total Dams
856
High Hazard
155
18.1%
Poor / Unsatisfactory
47
Average Age
67 yrs
Hazard Classification
High155 (18.1%)
Significant166 (19.4%)
Low535 (62.5%)
Condition Assessment
Satisfactory62 (7.2%)
Fair39 (4.6%)
Poor / Unsatisfactory47 (5.5%)
Not Rated708 (82.7%)
Federal
122
State
14
Local
94
Private
603
Tallest Dams
- Cougar Dam519 ft
- Detroit Dam463 ft
- Round Butte440 ft
- Owyhee Dam417 ft
- Brownlee395 ft
High Hazard Dams
- Cougar DamHigh
- Detroit DamHigh
- Round ButteHigh
- Owyhee DamHigh
- BrownleeHigh
Poor Condition Dams
- SmithUnsatisfactory
- Hosler (Reeder GulchUnsatisfactory
- Willow Creek 3 (Malheur)Unsatisfactory
- Clear BranchUnsatisfactory
- Bear CreekPoor
All Dams in Oregon
Showing 276–300 of 535
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mahon Reservoir Harney County | 31 | 1904 | Low | Not Rated |
| Mallories Dairy Lagoon #2 Marion County | 22 | — | Low | Not Rated |
| Mallories Lagoon #1 Marion County | 13 | — | Low | Not Rated |
| Malone Diversion Dam Klamath County | 32 | 1923 | Low | Not Available |
| Maple Grove Polk County | 38 | 1995 | Low | Not Rated |
| Marks Lake Dam Crook County | 20 | 1968 | Low | Not Rated |
| Martin Bros. Flashboard Dam Polk County | 11 | 1973 | Low | Not Rated |
| Marx Brothers Reservoir Polk County | 32 | 1977 | Low | Not Rated |
| Marx Reservoir #1 Polk County | 30 | 1964 | Low | Not Rated |
| Mc Corral Lake County | 16 | 1972 | Low | Not Rated |
| Mccoy Reservoir Klamath County | 24 | 1915 | Low | Not Rated |
| Mcfall, John Reservoir Klamath County | 22 | 1950 | Low | Not Rated |
| Mckay Acres Dam Marion County | 17 | 1968 | Low | Not Rated |
| Mc Nulty Dam Malheur County | 13 | 2004 | Low | Poor |
| Medford Forest Nursery Jackson County | 17 | 1978 | Low | Not Rated |
| Mehlhorn and Bassett Baker County | 20 | 1939 | Low | Not Rated |
| Meridian Reservoir Clackamas County | 38 | 1994 | Low | Not Rated |
| Merwin Reservoir #2 Crook County | 74 | 1968 | Low | Not Rated |
| Metolius (Lagoon) Jefferson County | 13 | — | Low | Not Rated |
| Metropolitan Sludge Ponds (Lagoon) Lane County | 17 | 1987 | Low | Not Rated |
| Midway Nursery Washington County | 31 | 1992 | Low | Not Rated |
| Miller Dam Wheeler County | 32 | 1990 | Low | Not Rated |
| Miller Reservoir (Harney) Harney County | 48 | 1947 | Low | Not Rated |
| Miller Reservoir (Wasco) Wasco County | 30 | 1952 | Low | Not Rated |
| Milton-Freewater Lagoon N-3 Umatilla County | 12 | 1988 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.