Johnson Dam is an earth dam located in Marshall County, South Dakota, built in 1993. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 190 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 Johnson Dam
The primary purpose of Johnson 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 Ron Johnson (private). It impounds the Wild Rice Creek-tr.
The dam stands 20 feet tall and stretches 190 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 52 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1993, the structure is 33 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 | Marshall |
| River/Stream | Wild Rice Creek-tr |
| Coordinates | 45.68125, -97.64598 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 190 ft |
| Year Completed | 1993 (33 years old) |
Storage & Hydraulics
| NID Storage | 52 acre-ft |
| Max Storage | 52 acre-ft |
| Normal Storage | 24 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 675 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Ron Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02672 |
| Federal ID | SD02672 |
| More Info | State Dam Safety Program |