Johnson is an earth dam located in Eau Claire County, Wisconsin, built in 1978. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 18 ft18 ft tall and 800 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
The primary purpose of Johnson is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by City of Augusta (local government). It impounds the Diamond Valley Creek near Augusta.
The dam stands 18 feet tall and stretches 800 feet across, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1978, the structure is 48 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 07/27/2018.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wisconsin |
| County | Eau Claire |
| Nearest City | Augusta |
| River/Stream | Diamond Valley Creek |
| Coordinates | 44.61567, -91.10672 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 800 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Drainage Area | 2 sq mi |
| Max Discharge | 100 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | City of Augusta |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/27/2018 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00993 |
| Federal ID | WI00993 |
| More Info | State Dam Safety Program |