Alderly Mill is a gravity dam located in Dodge County, Wisconsin, built in 1962. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 9 ft9 ft tall and 220 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Alderly Mill
The primary purpose of Alderly Mill is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Deertrak Golf Club (private). It impounds the Ashippun near Alderly.
The dam stands 9 feet tall and stretches 220 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 90 acre-feet, and collects water from a drainage area of 24 square miles. Completed in 1962, 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. 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 12/03/2012. That was over 13 years ago.
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Location
| State | Wisconsin |
| County | Dodge |
| Nearest City | Alderly |
| River/Stream | Ashippun |
| Coordinates | 43.21750, -88.44740 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 220 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 90 acre-ft |
| Max Storage | 90 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 24 sq mi |
| Max Discharge | 206 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Deertrak Golf Club |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 12/03/2012 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00562 |
| Federal ID | WI00562 |
| More Info | State Dam Safety Program |