Harriet Lake
Key Takeaway
Harriet Lake is classified as low hazard in Oregon. It was completed in 1923 and is 103 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 68 ft (taller than 90.7% in OR) |
| Dam Length | 186 ft |
| Dam Type | Arch |
| Max Storage | 400 acre-ft |
| Normal Storage | 152 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 131 sq mi |
| Max Discharge | 11,200 cfs |
| Year Completed | 1923 (103 years old) |
| NID ID | OR00546 |
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
Portland General Electric Company
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Harriet Lake?
Harriet 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 Harriet Lake?
Harriet Lake is owned by Portland General Electric Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Harriet Lake built?
Harriet Lake was completed in 1923, making it 103 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 Harriet Lake?
Harriet Lake serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Harriet Lake?
Harriet Lake has a dam height of 68 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 Harriet Lake last inspected?
Harriet Lake was last inspected on September 20, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.