Fourmile Lake
Key Takeaway
Fourmile Lake is classified as low hazard in Oregon. It was completed in 1921 and is 105 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Height | 25 ft (taller than 43.9% in OR) |
| Dam Length | 660 ft |
| Dam Type | Rockfill |
| Max Storage | 15.8K acre-ft |
| Normal Storage | 15.6K acre-ft |
| Surface Area | 962 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 500 cfs |
| Year Completed | 1921 (105 years old) |
| NID ID | OR00022 |
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
MEDFORD ID;RECLAMATION
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Fourmile Lake?
Fourmile Lake 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 Fourmile Lake?
Fourmile Lake is owned by MEDFORD ID;RECLAMATION (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Fourmile Lake built?
Fourmile Lake was completed in 1921, making it 105 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 Fourmile Lake?
Fourmile Lake serves the following purposes: Flood Risk Reduction, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Fourmile Lake?
Fourmile Lake has a dam height of 25 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Fourmile Lake last inspected?
Fourmile Lake was last inspected on September 15, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.