Maria

Unnamed Stream· San Joaquin, California· Built 2003· Earth· 48 ft tall
High Hazard Water Supply Irrigation Private

Key Takeaway

Maria is classified as high hazard in California. It was completed in 2003 and is 23 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 48 ft (taller than 57.4% in CA)
Dam Length610 ft
Dam TypeEarth
Max Storage277 acre-ft
Surface Area17 acres
Drainage Area4 sq mi
Year Completed2003 (23 years old)
NID IDCA01468

Safety Information

High Hazard

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?

Emergency Action Plan: Yes
Last Inspection: October 26, 2021
State Regulated: Yes
Regulatory Agency: DWR, Division of Safety of Dams

Ownership

Studley Company

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Maria?

Maria 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 Maria?

Maria is owned by Studley Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Maria built?

Maria was completed in 2003, making it 23 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 Maria?

Maria 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 Maria?

Maria has a dam height of 48 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 Maria last inspected?

Maria was last inspected on October 26, 2021. 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.