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 476–500 of 856
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| 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 |
| Micke Lake County | 20 | — | Significant | Not Rated |
| Middle Clatsop County | 39 | 1940 | High | Fair |
| Midway Nursery Washington County | 31 | 1992 | Low | Not Rated |
| Mill Creek Lincoln County | 74 | 1969 | High | Fair |
| 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 |
| Minam Lake Reservoir Company Wallowa County | 14 | 1922 | Low | Not Rated |
| Mission Creek Dam and Reservoir Company Marion County | 25 | 1972 | Low | Not Rated |
| Mitchell - Stanley Reservoir Clackamas County | 26 | 1960 | Low | Not Rated |
| Moffitti Marsh Dam Polk County | 10 | 1995 | Low | Fair |
| Mompano Clackamas County | 44 | 1971 | High | Satisfactory |
| Momtazi - Reservoir #2 Yamhill County | 39 | 2000 | Low | Not Rated |
| Moon Reservoir Harney County | 38 | 1969 | Significant | Not Rated |
| Moore-Emory Benton County | 33 | 1962 | Low | Not Rated |
| Moores Hollow Malheur County | 35 | 1964 | Significant | Not Available |
| Morfitt Reservoir Baker County | 20 | 1914 | Low | Not Rated |
| Morgan Brothers Dam Polk County | 35 | 1962 | Low | Poor |
| Morgan Lake Union County | 24 | 1976 | High | Poor |
| Morrison Dam Malheur County | 33 | 1911 | Low | Poor |
| Morrow Brothers (Jefferson) Jefferson County | 25 | 1970 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.