Monterey

ASHIPPUN· Waukesha, Wisconsin· Built 1848· Gravity· 16 ft tall
Low Hazard Recreation Local Government

Key Takeaway

Monterey is classified as low hazard in Wisconsin. It was completed in 1848 and is 178 years old. Its primary use is recreation.

Physical Details

Dam Height 16 ft (taller than 48.8% in WI)
Dam Length221 ft
Dam TypeGravity
Max Storage200 acre-ft
Normal Storage70 acre-ft
Surface Area28 acres
Drainage Area41 sq mi
Max Discharge706 cfs
Year Completed1848 (178 years old)
NID IDWI00221

Safety Information

Low Hazard

No probable loss of human life and low economic/environmental losses expected.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: Yes
Last Inspection: August 5, 2013
State Regulated: Yes
Regulatory Agency: WIDNR

Ownership

Town of Oconomowoc

Local Government

Nearby Dams

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Alderly Mill

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Oconomowoc Lake

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Okauchee Lake

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Lower Lake Nemahbin

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Neosho

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Delafield Fish Hatchery

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Monches

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Frequently Asked Questions

What is the hazard classification of Monterey?

Monterey is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Monterey?

Monterey is owned by Town of Oconomowoc (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Monterey built?

Monterey was completed in 1848, making it 178 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Monterey?

Monterey serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Monterey?

Monterey has a dam height of 16 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

When was Monterey last inspected?

Monterey was last inspected on August 5, 2013. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.