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 501–525 of 856
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mortimer Canyon Dam Harney County | 30 | 1951 | Low | Not Rated |
| Mosley Reservoir Baker County | 20 | 1950 | Low | Not Rated |
| Moss Flat Lake County | 11 | — | Low | Not Rated |
| Mt. Hood Community College Dam Multnomah County | 58 | 1968 | Significant | Not Rated |
| Mt. Springs Ranch Dam Polk County | 42 | 1969 | Significant | Not Rated |
| Mud Creek #1 Reservoir Malheur County | 10 | 1957 | Low | Not Rated |
| Mud Creek Dam Malheur County | 7 | 1961 | Low | Not Rated |
| Muddy Creek Reservoir Lake County | 26 | 1962 | Significant | Not Rated |
| Mud Flat Reservoir Malheur County | 18 | 1917 | Low | Not Rated |
| Mud Lake Lake County | 23 | 1962 | Low | Not Rated |
| Muhs Quarry Dam Yamhill County | 40 | — | Significant | Not Rated |
| Mulkey, Gryland Reservoir Polk County | 10 | 1981 | Low | Not Rated |
| Multnomanh Channel Dam #2 Multnomah County | 12 | — | Low | Not Rated |
| Munn Reservoir Baker County | 23 | 1947 | Low | Not Rated |
| Murphy Dam Malheur County | 62 | 1950 | Low | Not Rated |
| Murray Reservoir Baker County | 21 | 1927 | Low | Not Rated |
| Neil Creek Reservoir Marion County | 39 | 1955 | Significant | Not Rated |
| Nelson Reservoir No. 1 Jackson County | 36 | 1957 | Low | Not Rated |
| New England Bolt and Thread Reservoir Yamhill County | 15 | — | Low | Not Rated |
| N. Fk. Indian Creek Reservoir Malheur County | 59 | 1951 | Low | Not Rated |
| Noble Reservoir 1 Klamath County | 12 | 1961 | Low | Not Rated |
| North Canal Diversion Deschutes County | 35 | 1906 | High | Fair |
| North Fork Benton County | 83 | 1960 | High | Fair |
| North Fork Clackamas County | 207 | 1958 | High | Satisfactory |
| North Fork Diversion Dam Jackson County | 50 | 1965 | Significant | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.