Riggs Flat is an earth dam located in Graham County, Arizona, built in 1951. It carries a Low hazard potential classification.
Dam profile
NID height · 45 ft45 ft tall and 390 ft long, taller than 90% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Riggs Flat
The primary purpose of Riggs Flat is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Arizona Game & Fish Department (state). It impounds the Grant Creek - Tr near Willcox.
The dam stands 45 feet tall and stretches 390 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 155 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1951, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 12/03/2013. That was over 12 years ago.
At 45 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Arizona |
| County | Graham |
| Nearest City | Willcox |
| River/Stream | Grant Creek - Tr |
| Coordinates | 32.70806, -109.96611 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 390 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 155 acre-ft |
| Max Storage | 155 acre-ft |
| Normal Storage | 123 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Arizona Game & Fish Department |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 12/03/2013 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ00090 |
| Federal ID | AZ00090 |
| More Info | State Dam Safety Program |