Lucky Peak Dam

BOISE RIVER· Ada, Idaho· Built 1955· Rockfill·
High Hazard Flood Risk Reduction Irrigation Recreation Hydroelectric Federal Government

Key Takeaway

Lucky Peak Dam is classified as high hazard in Idaho. It was completed in 1955 and is 71 years old. Its primary use is flood risk reduction. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.

Physical Details

Dam Length2,340 ft
Dam TypeRockfill
Max Storage307.0K acre-ft
Normal Storage293.1K acre-ft
Surface Area2,820 acres
Drainage Area2,680 sq mi
Max Discharge93,300 cfs
Year Completed1955 (71 years old)
NID IDID00288

Safety Information

High Hazard

Loss of human life is likely if the dam fails.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: Yes
Last Inspection: January 30, 2020
State Regulated: Yes

Ownership

USACE - Walla Walla District

Federal Government

Nearby Dams

Boise River Diversion

Ada, ID

High Hazard 57 ft

Barber

Ada, ID

Significant Hazard 26 ft

Blacks Creek

Ada, ID

High Hazard 52 ft

Orchard

Ada, ID

Significant Hazard 43 ft

Arrowrock

Boise, ID

High Hazard 350 ft

Cottonwood Creek Lower

Ada, ID

Significant Hazard 15 ft

Cottonwood Creek Middle

Ada, ID

Significant Hazard 20 ft

Cottonwood Creek Upper

Ada, ID

Significant Hazard 18 ft

Frequently Asked Questions

What is the hazard classification of Lucky Peak Dam?

Lucky Peak Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Lucky Peak Dam?

Lucky Peak Dam is owned by USACE - Walla Walla District (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Lucky Peak Dam built?

Lucky Peak Dam was completed in 1955, making it 71 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 Lucky Peak Dam?

Lucky Peak Dam serves the following purposes: Flood Risk Reduction, Irrigation, Recreation, Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

When was Lucky Peak Dam last inspected?

Lucky Peak Dam was last inspected on January 30, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.