Rock Cowan No.2
Rock Cowan No.2 is an earth dam located in Dewey County, South Dakota, built in 1951. It carries a Low hazard potential classification.
About Rock Cowan No.2
The primary purpose of Rock Cowan No.2 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 Rock Cowan (private). It impounds the Tr Moreau.
The dam stands 19 feet tall and stretches 430 feet across, and has a maximum storage capacity of 65 acre-feet. 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.
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Location
| State | South Dakota |
| County | Dewey |
| Nearest City | None |
| River/Stream | Tr Moreau |
| Coordinates | 45.08833, -101.44666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 430 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 65 acre-ft |
| Max Storage | 65 acre-ft |
| Normal Storage | 40 acre-ft |
| Max Discharge | 1,470 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | ROCK COWAN |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00353 |
| Federal ID | SD00353 |
| More Info | State Dam Safety Program |