Vernon Marsh-n.flowage is an earth dam located in Waukesha County, Wisconsin, built in 1962. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 7 ft7 ft tall. 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 Vernon Marsh-n.flowage
The primary purpose of Vernon Marsh-n.flowage is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Wisconsin Department of Natural Resources (state). It impounds the Pebble Brook.
The dam stands 7 feet tall, creates a reservoir covering 155 acres, has a maximum storage capacity of 500 acre-feet, and collects water from a drainage area of 5 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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/07/2020.
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Location
| State | Wisconsin |
| County | Waukesha |
| Nearest City | None |
| River/Stream | Pebble Brook |
| Coordinates | 42.92348, -88.28423 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 500 acre-ft |
| Max Storage | 500 acre-ft |
| Normal Storage | 200 acre-ft |
| Surface Area | 155 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 87 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Wisconsin Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/07/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI01104 |
| Federal ID | WI01104 |
| More Info | State Dam Safety Program |