Jordan Reservoir Report

Last Updated: December 6, 2025

Jordan, also known as Mcgreer's Mill, is a gravity dam located in Park Ridge, Wisconsin, along the Big Plover River.


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Summary

Completed in 1850, this dam serves a primary purpose of recreation and has a storage capacity of 470 acre-feet. With a hydraulic height of 13 feet and a structural height of 17 feet, Jordan spans 150 feet in length and covers a surface area of 83 acres within a drainage area of 148 square miles.

Despite its historical significance, Jordan is currently rated as having poor condition and a low hazard potential. The last inspection in May 2017 revealed a need for maintenance and repairs to ensure the dam's safety and functionality. The risk assessment for Jordan is very high, indicating the importance of implementing effective risk management measures to mitigate potential dangers associated with the dam.

As water resource and climate enthusiasts, it is crucial to monitor and address the issues surrounding Jordan to protect both the environment and the community it serves. By investing in the necessary upgrades and maintenance, stakeholders can ensure the long-term sustainability and safety of this historic structure while preserving its recreational value for future generations.

Years Modified

1905 - Other

Year Completed

1850

Dam Length

150

Dam Height

17

River Or Stream

BIG PLOVER

Primary Dam Type

Gravity

Surface Area

83

Hydraulic Height

13

Drainage Area

148

Nid Storage

470

Structural Height

17

Hazard Potential

Low

Nid Height

17
       
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.