Johnson #3 is an earth dam located in Niobrara County, Wyoming, built in 1944. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 444 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 #3
The primary purpose of Johnson #3 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Johnson Family Ranches Llc& State Lands (private). It impounds the Swede Draw near Edgemont S D.
The dam stands 22 feet tall and stretches 444 feet across, creates a reservoir covering 14 acres, and has a maximum storage capacity of 161 acre-feet. Completed in 1944, 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/22/2023.
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Location
| State | Wyoming |
| County | Niobrara |
| Nearest City | Edgemont S D |
| River/Stream | Swede Draw |
| Coordinates | 43.14139, -104.48417 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 444 ft |
| Year Completed | 1944 (82 years old) |
Storage & Hydraulics
| NID Storage | 161 acre-ft |
| Max Storage | 161 acre-ft |
| Normal Storage | 71 acre-ft |
| Surface Area | 14 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Johnson Family Ranches Llc& State Lands |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/22/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00528 |
| Federal ID | WY00528 |
| More Info | State Dam Safety Program |