A and C

Sfk Willow Creek· Modoc, California· Built 1923· Earth· 13 ft tall
Low Hazard Water Supply Irrigation Private

Key Takeaway

A and C is classified as low hazard in California. It was completed in 1923 and is 103 years old. Its primary use is water supply.

Physical Details

Dam Height 13 ft (taller than 5.6% in CA)
Dam Length1,200 ft
Dam TypeEarth
Max Storage800 acre-ft
Surface Area210 acres
Drainage Area120 sq mi
Year Completed1923 (103 years old)
NID IDCA00915

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: June 28, 2022
State Regulated: Yes
Regulatory Agency: DWR, Division of Safety of Dams

Ownership

Private Entity

Private

Nearby Dams

Bayley Reservoir

Modoc, CA

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Boles Meadow

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Janes Flat

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Telephone Flat

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Reservoir C

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Significant Hazard 20 ft

Ingals Swamp

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Reservoir M

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Low Hazard 13 ft

South Mountain

Modoc, CA

Low Hazard 10 ft

Frequently Asked Questions

What is the hazard classification of A and C?

A and C 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 A and C?

A and C is owned by Private Entity (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was A and C built?

A and C was completed in 1923, making it 103 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 A and C?

A and C serves the following purposes: Water Supply, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is A and C?

A and C has a dam height of 13 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 A and C last inspected?

A and C was last inspected on June 28, 2022. 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.