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 101–125 of 856
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Tribbett Reservoir Marion County | 27 | 1969 | Low | Not Rated |
| Traverse Lake Reservoir Union County | 10 | 1922 | Low | Not Rated |
| Trail Bridge Saddle Dike Linn County | 35 | 1963 | High | Satisfactory |
| Toketee Douglas County | 58 | 1949 | High | Unsatisfactory |
| Timothy Lake Clackamas County | 100 | 1956 | High | Satisfactory |
| Timber Lake Clackamas County | 46 | — | Significant | Not Rated |
| Three Mile Flat Reservoir Klamath County | 27 | 1964 | Low | Not Rated |
| Three Mile Falls Diversion Umatilla County | 28 | 1913 | Low | Not Available |
| Three Mile Creek Reservoir Harney County | 14 | 1946 | Low | Not Rated |
| Three Creeks Natural Area Clackamas County | 14 | — | Significant | Not Rated |
| Three Creek Deschutes County | 21 | — | Significant | Not Rated |
| Thompson Valley Reservoir Lake County | 48 | 1922 | Significant | Not Rated |
| Thompson Valley Diversion (Slid) Lake County | 48 | 1915 | Significant | Not Rated |
| Thompson (Benton) Benton County | 44 | 1956 | Significant | Not Rated |
| Thomas-Cavender Grant County | 32 | 1985 | Low | Not Rated |
| Thief Valley Dam Union County | 73 | 1932 | High | Not Available |
| The Dalles Lock and Dam Klickitat County | 200 | 1957 | High | Not Available |
| Teasel Creek Clackamas County | 23 | 1972 | Significant | Not Rated |
| Taylor Reservoir Lake County | 33 | 1985 | Low | Not Rated |
| Taverner Marsh Dam Polk County | 9 | 1998 | Low | Poor |
| Tarheel Coos County | 20 | 1924 | High | Satisfactory |
| Tall Timber Lake Josephine County | 28 | 1965 | Low | Not Rated |
| Tahkenitch Lake Douglas County | 12 | 1964 | Low | Not Rated |
| Taft Miller Homestead Harney County | 12 | — | Low | Not Rated |
| Swamp Creek Reservoir (Harney) Harney County | 24 | 1925 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.