Jonjak is an earth dam located in Sawyer County, Wisconsin, built in 1967. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 280 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 Jonjak
Jonjak is a dam in Sawyer, Wisconsin. The dam is owned by Tony Jonjak (private). It impounds the Minnemac Lake Outlet.
The dam stands 11 feet tall and stretches 280 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 130 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1967, 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 | Wisconsin |
| County | Sawyer |
| Nearest City | None |
| River/Stream | Minnemac Lake Outlet |
| Coordinates | 45.91048, -91.47589 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 280 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 130 acre-ft |
| Max Storage | 130 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Tony Jonjak |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WI00476 |
| Federal ID | WI00476 |
| More Info | State Dam Safety Program |