Chapman

About Chapman

The primary purpose of Chapman is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Prima Ranches, Llc (gates, Valerie) (private). It impounds the Little Oak Creek near Oak Creek.

The dam stands 34 feet tall and stretches 250 feet across, creates a reservoir covering 22 acres, and has a maximum storage capacity of 471 acre-feet. Completed in 1940, the structure is well-established, with more than 75 years of service.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 09/22/2021.

At 34 feet, this dam is taller than 80% of dams nationwide.

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