Ray Martinmaas Dam is an earth dam located in Hand County, South Dakota, built in 2022. It carries a Low hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 388 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 Ray Martinmaas Dam
The primary purpose of Ray Martinmaas Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ray Martinmaas (private). It impounds the Matter Creek.
The dam stands 17 feet tall and stretches 388 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 86 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2022, 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 | Hand |
| River/Stream | Matter Creek |
| Coordinates | 44.84846, -99.14057 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 388 ft |
| Year Completed | 2022 (4 years old) |
Storage & Hydraulics
| NID Storage | 86 acre-ft |
| Max Storage | 86 acre-ft |
| Normal Storage | 43 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 990 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Ray Martinmaas |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02651 |
| Federal ID | SD02651 |
| More Info | State Dam Safety Program |