Irwin Dam is an earth dam located in Tripp County, South Dakota, built in 1938. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 1,400 ft long. 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 Irwin Dam
The primary purpose of Irwin Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Don Manscheim (private). It impounds the White River Off Stream.
The dam stands 20 feet tall and stretches 1,400 feet across, creates a reservoir covering 45 acres, has a maximum storage capacity of 315 acre-feet, and collects water from a drainage area of 17 square miles. Completed in 1938, the structure is well-established, with more than 75 years of service.
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 05/09/1990. That was over 36 years ago.
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Location
| State | South Dakota |
| County | Tripp |
| Nearest City | None |
| River/Stream | White River Off Stream |
| Coordinates | 43.30833, -99.59666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,400 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 684 acre-ft |
| Max Storage | 315 acre-ft |
| Normal Storage | 684 acre-ft |
| Surface Area | 45 acres |
| Drainage Area | 17 sq mi |
| Max Discharge | 1,946 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Don Manscheim |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/09/1990 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00543 |
| Federal ID | SD00543 |
| More Info | State Dam Safety Program |