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 526–550 of 856
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| North Fork Diversion Dam Jackson County | 55 | 1928 | High | Fair |
| Oakridge Mill Log Pond Lane County | 14 | 1947 | Low | Not Rated |
| Obenchain Reservoir Klamath County | 30 | 1958 | Low | Not Rated |
| Oberg Reservoir Yamhill County | 38 | 1970 | Low | Not Rated |
| Ochoco Dam Crook County | 146 | 1920 | High | Not Available |
| Oconnor Puddle Klamath County | 13 | 1969 | Low | Not Rated |
| Odell, Ben Malheur County | 16 | 1954 | Low | Not Rated |
| O.E.Loe Dam 2 Porter Place Marion County | 25 | — | Low | Not Available |
| Officer Reservoir Grant County | 35 | 1970 | Low | Not Rated |
| Olalla Lincoln County | 83 | 1968 | High | Fair |
| Olive Lake Grant County | 39 | 1907 | High | Not Rated |
| Olson Flashboard Dam Yamhill County | 16 | 1975 | Significant | Not Rated |
| Olson, Phillip 2-B Yamhill County | 18 | 1977 | Low | Not Rated |
| Olson Reservoir (Mark) Polk County | 25 | 1988 | Significant | Not Rated |
| Opal Springs Jefferson County | 21 | 1985 | Low | Satisfactory |
| Oregon End Dam Harney County | 16 | 1955 | Low | Not Rated |
| Oregon Pride Nursery Dam Yamhill County | 39 | — | Low | Not Rated |
| Oriana Reservoir Harney County | 16 | 1931 | Low | Not Rated |
| Osborne Creek Jackson County | 65 | 1964 | High | Poor |
| Osburn Reservoir Multnomah County | 35 | 1967 | Low | Not Rated |
| Oscar Dam Harney County | 12 | 1975 | Low | Satisfactory |
| Oswego Lake Dam Clackamas County | 34 | 1921 | Significant | Not Rated |
| Owen Jackson County | 31 | 1975 | Low | Not Rated |
| Owyhee Dam Malheur County | 417 | 1932 | High | Not Available |
| Oxbow Dam (Klamath) Klamath County | 24 | 1919 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.