Clearwell Phase 2
Key Takeaway
Clearwell Phase 2 is classified as low hazard in California. It was completed in 1977 and is 49 years old. Its primary use is water supply.
Physical Details
| Dam Height | 30 ft (taller than 30.4% in CA) |
| Dam Length | 2,090 ft |
| Dam Type | Earth |
| Max Storage | 100 acre-ft |
| Surface Area | 6 acres |
| Year Completed | 1977 (49 years old) |
| NID ID | CA01109 |
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
Central Contra Costa Sanitary District
Public Utility
Nearby Dams
Mallard
Contra Costa, CA
High Hazard 30 ftMartinez
Contra Costa, CA
High Hazard 44 ftLeland
Contra Costa, CA
High Hazard 41 ftPond 2b
Solano, CA
Low Hazard 55 ftVista Del Mar Detention Basin
Contra Costa, CA
High Hazard 42 ftPine Creek Detention
Contra Costa, CA
High Hazard 30 ftLake Herman
Solano, CA
High Hazard 51 ftLafayette
Contra Costa, CA
High Hazard 132 ftFrequently Asked Questions
What is the hazard classification of Clearwell Phase 2?
Clearwell Phase 2 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 Clearwell Phase 2?
Clearwell Phase 2 is owned by Central Contra Costa Sanitary District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Clearwell Phase 2 built?
Clearwell Phase 2 was completed in 1977, making it 49 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 Clearwell Phase 2?
Clearwell Phase 2 serves the following purposes: Water Supply, Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Clearwell Phase 2?
Clearwell Phase 2 has a dam height of 30 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 Clearwell Phase 2 last inspected?
Clearwell Phase 2 was last inspected on February 8, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.