Johnson Dam
Johnson Dam is an earth dam located in Deuel County, South Dakota, built in 1965. It carries a Low hazard potential classification.
About Johnson Dam
The primary purpose of Johnson Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by James A. Johnson (private). It impounds the Trib. Mud Creek.
The dam stands 24 feet tall and stretches 250 feet across, and has a maximum storage capacity of 180 acre-feet. Completed in 1965, the structure is well into its service life at over 50 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 | Deuel |
| Nearest City | None |
| River/Stream | Trib. Mud Creek |
| Coordinates | 44.97466, -96.62581 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 250 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 180 acre-ft |
| Max Storage | 180 acre-ft |
| Normal Storage | 50 acre-ft |
| Max Discharge | 675 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JAMES A. JOHNSON |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02236 |
| Federal ID | SD02236 |
| More Info | State Dam Safety Program |