Ortman Dam is an earth dam located in McCook County, South Dakota, built in 2001. It carries a Low hazard potential classification.
Dam profile
NID height · 22 ft22 ft tall and 375 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 Ortman Dam
The primary purpose of Ortman Dam is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Delmar Ortman (private). It impounds the Tr. W. Fork Vermillion River.
The dam stands 22 feet tall and stretches 375 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 145 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 2001, the structure is relatively new.
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 | McCook |
| River/Stream | Tr. W. Fork Vermillion River |
| Coordinates | 43.50745, -97.31550 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 375 ft |
| Year Completed | 2001 (25 years old) |
Storage & Hydraulics
| NID Storage | 145 acre-ft |
| Max Storage | 145 acre-ft |
| Normal Storage | 59 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 2,025 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Delmar Ortman |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02494 |
| Federal ID | SD02494 |
| More Info | State Dam Safety Program |