Oakridge Lake Estates Dam Reservoir Report

Last Updated: December 5, 2025

Oakridge Lake Estates Dam, located in Johnson County, Iowa, was completed in 1977 with a primary purpose of providing recreational opportunities for the community.


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Summary

The dam is classified as an Earth-type structure with a height of 42 feet and a length of 620 feet, creating a reservoir with a maximum storage capacity of 326 acre-feet. The dam is situated on TR-McAllister Creek, within the CORALVILLE RESERVOIR area, and is owned and regulated by a private entity.

Despite being categorized as having a low hazard potential, the dam is considered to have a moderate risk level, with a rating of 3 out of 5. The condition of the dam has not been formally rated, and there is no designated Emergency Action Plan in place. The Iowa Department of Natural Resources oversees the regulation, permitting, inspection, and enforcement of the dam, ensuring its compliance with state standards and safety measures. With its scenic surroundings and recreational offerings, Oakridge Lake Estates Dam serves as both a functional water resource structure and a popular destination for outdoor enthusiasts in the region.

As climate change continues to impact water resources and infrastructure, the maintenance and monitoring of dams like Oakridge Lake Estates Dam become increasingly important. Understanding the risk factors and implementing proper risk management measures are essential in ensuring the safety and longevity of such structures in the face of changing climate patterns and potential extreme weather events. Interested parties and stakeholders in water resource management and climate resilience can find valuable insights in the data and management practices associated with Oakridge Lake Estates Dam in Johnson County, Iowa.

Year Completed

1977

Dam Length

620

Dam Height

42

River Or Stream

TR-MCALLISTER CREEK

Primary Dam Type

Earth

Surface Area

12

Drainage Area

0.33

Nid Storage

326

Hazard Potential

Low

Foundations

Soil

Nid Height

42
       
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.