Hamms Detention Dam

WILLOW CK./MILK RIVER· Valley, Montana· Built 1957· Gravity·
Low Hazard Fire Protection Stock Or Small Fish Pond Federal Government

Key Takeaway

Hamms Detention Dam is classified as low hazard in Montana. It was completed in 1957 and is 69 years old. Its primary use is fire protection.

Physical Details

Dam Length2,760 ft
Dam TypeGravity
Max Storage495 acre-ft
Normal Storage0 acre-ft
Surface Area110 acres
Drainage Area12 sq mi
Year Completed1957 (69 years old)
NID IDMT00683

Safety Information

Low Hazard

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?

Emergency Action Plan: No
Last Inspection: July 16, 2011
State Regulated: No

Ownership

DOI BLM

Federal Government

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Hamms Detention Dam?

Hamms Detention 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 Hamms Detention Dam?

Hamms Detention Dam is owned by DOI BLM (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Hamms Detention Dam built?

Hamms Detention Dam was completed in 1957, making it 69 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 Hamms Detention Dam?

Hamms Detention Dam serves the following purposes: Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

When was Hamms Detention Dam last inspected?

Hamms Detention Dam was last inspected on July 16, 2011. 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.