Concow
Key Takeaway
Concow is classified as high hazard in California. It was completed in 1925 and is 101 years old. Its primary use is water supply. 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 | 94 ft (taller than 80.5% in CA) |
| Dam Length | 335 ft |
| Dam Type | Arch |
| Max Storage | 6.4K acre-ft |
| Surface Area | 280 acres |
| Drainage Area | 15 sq mi |
| Year Completed | 1925 (101 years old) |
| NID ID | CA00277 |
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
Thermalito Water and Sewer District
Public Utility
Nearby Dams
Kunkle
Butte, CA
Significant Hazard 54 ftMagalia
Butte, CA
High Hazard 103 ftBig Bend
Butte, CA
Low Hazard 61 ftParadise
Butte, CA
High Hazard 175 ftPoe
Butte, CA
Low Hazard 80 ftDe Sabla Forebay
Butte, CA
Low Hazard 52 ftLake Madrone
Butte, CA
High Hazard 37 ftCresta
Plumas, CA
Significant Hazard 113 ftFrequently Asked Questions
What is the hazard classification of Concow?
Concow 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 Concow?
Concow is owned by Thermalito Water and Sewer District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Concow built?
Concow was completed in 1925, making it 101 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 Concow?
Concow serves the following purposes: Water Supply, Irrigation, Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Concow?
Concow has a dam height of 94 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 Concow last inspected?
Concow was last inspected on April 5, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.