Costich Dam
Key Takeaway
Costich Dam is classified as high hazard in Montana. It was completed in 1956 and is 70 years old. Its primary use is irrigation. 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 Height | 29 ft (taller than 82.2% in MT) |
| Dam Length | 215 ft |
| Dam Type | Earth |
| Max Storage | 570 acre-ft |
| Normal Storage | 470 acre-ft |
| Surface Area | 44 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 82 cfs |
| Year Completed | 1956 (70 years old) |
| Year Modified | 1999 |
| NID ID | MT01025 |
Safety Information
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?
Ownership
GLEN LAKE IRRIGATION DISTRICT
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Costich Dam?
Costich 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 Costich Dam?
Costich Dam is owned by GLEN LAKE IRRIGATION DISTRICT (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Costich Dam built?
Costich Dam was completed in 1956, making it 70 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 Costich Dam?
Costich Dam serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Costich Dam?
Costich Dam has a dam height of 29 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 Costich Dam last inspected?
Costich Dam was last inspected on June 22, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.