A.w. Spiry
A.w. Spiry is an earth dam located in Walworth County, South Dakota, built in 1956. It carries a Low hazard potential classification.
About A.w. Spiry
The primary purpose of A.w. Spiry is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by A.w. Spiry (private). It impounds the Tr-missouri.
The dam stands 25 feet tall and stretches 380 feet across, and has a maximum storage capacity of 70 acre-feet. Completed in 1956, 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.
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Location
| State | South Dakota |
| County | Walworth |
| Nearest City | None |
| River/Stream | Tr-missouri |
| Coordinates | 45.53499, -100.35666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 380 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 35 acre-ft |
| Max Discharge | 600 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | A.W. SPIRY |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01090 |
| Federal ID | SD01090 |
| More Info | State Dam Safety Program |