Pettegrew Dam is an earth dam located in Fall River County, South Dakota, built in 1910. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 500 ft long, taller than 50% 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 Pettegrew Dam
The primary purpose of Pettegrew Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Delwin Elwess (private). It impounds the Horsehead Creek-tr.
The dam stands 25 feet tall and stretches 500 feet across, and has a maximum storage capacity of 140 acre-feet. Completed in 1910, the structure is over a century 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 | Fall River |
| Nearest City | None |
| River/Stream | Horsehead Creek-tr |
| Coordinates | 43.02701, -103.31995 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 500 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Normal Storage | 98 acre-ft |
| Max Discharge | 2,275 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Delwin Elwess |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00649 |
| Federal ID | SD00649 |
| More Info | State Dam Safety Program |