Donovan No.2(Robey Group) Reservoir Report

Last Updated: December 6, 2025

Donovan No.2, part of the Robey Group, is a privately owned earth dam located in Pierce, Wisconsin, with a primary purpose classified as "Other." Constructed in 1973 by USDA NRCS, this structure stands at a height of 26 feet and spans a length of 304 feet.


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Summary

With a maximum storage capacity of 19 acre-feet and a drainage area of 0.12 square miles, Donovan No.2 regulates the flow of the Tr to Trimbelle River. The dam features an uncontrolled spillway and outlet gates, with a low hazard potential and a moderate risk assessment rating.

Managed and funded by the Natural Resources Conservation Service, Donovan No.2 is currently assessed to be in "Not Available" condition. Although the dam has not been inspected recently, it is deemed to have a moderate risk level. The emergency action plan status, inundation maps, and risk management measures for this structure are currently marked as unavailable. The surrounding area is represented by Congressman Ron Kind (D), and the dam falls under the jurisdiction of the Detroit District of the US Army Corps of Engineers. For water resource and climate enthusiasts, Donovan No.2 presents an intriguing case of a privately owned dam with unique characteristics and regulatory oversight.

Year Completed

1973

Dam Length

304

Dam Height

26

River Or Stream

Tr To Trimbelle River

Primary Dam Type

Earth

Drainage Area

0.12

Nid Storage

19

Outlet Gates

Uncontrolled

Hazard Potential

Low

Nid Height

26
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
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Area Campgrounds