Morrison Dam
Morrison Dam is a gravity dam located in Malheur County, Oregon, built in 1911. It carries a Low hazard potential classification and has a poor condition assessment.
About Morrison Dam
The primary purpose of Morrison Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Doi Blm (federal). It impounds the S. Fk. L Willow Creek near Farm/ranch/canal.
The dam stands 33 feet tall and stretches 425 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 115 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1911, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 09/24/2020.
At 33 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Oregon |
| County | Malheur |
| Nearest City | Farm/ranch/canal |
| River/Stream | S. Fk. L Willow Creek |
| Coordinates | 44.11368, -117.49285 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 33 ft |
| Dam Length | 425 ft |
| Year Completed | 1911 (115 years old) |
Storage & Hydraulics
| NID Storage | 115 acre-ft |
| Max Storage | 115 acre-ft |
| Normal Storage | 115 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 919 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/24/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00570 |
| Federal ID | OR00570 |
| More Info | State Dam Safety Program |