Lower Rimrock Dam
Key Takeaway
Lower Rimrock Dam is classified as low hazard in Washington. It was completed in 1972 and is 54 years old. Its primary use is recreation.
Physical Details
| Dam Length | 255 ft |
| Dam Type | Rockfill |
| Max Storage | 550 acre-ft |
| Normal Storage | 550 acre-ft |
| Surface Area | 550 acres |
| Drainage Area | 256 sq mi |
| Max Discharge | 22,400 cfs |
| Year Completed | 1972 (54 years old) |
| NID ID | WA00036 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
The Nature Conservancy
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Lower Rimrock Dam?
Lower Rimrock Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Lower Rimrock Dam?
Lower Rimrock Dam is owned by The Nature Conservancy (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Rimrock Dam built?
Lower Rimrock Dam was completed in 1972, making it 54 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Lower Rimrock Dam?
Lower Rimrock Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.