Fridley Dam Reservoir Report

Last Updated: December 8, 2025

Fridley Dam, located in Warren County, Iowa, was completed in 2001 and serves primarily for fire protection, stock, and small fish pond purposes.


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Summary

This private dam, designed by NRCS, stands at a height of 28 feet and has a length of 378 feet, with a normal storage capacity of 22 acre-feet. The dam is situated on TR- Otter Creek near RED ROCK RESERVOIR, with a low hazard potential and a moderate risk assessment rating.

Managed by the Iowa Department of Natural Resources, Fridley Dam is subject to state regulations, permitting, inspection, and enforcement. It is built with earth materials on a soil foundation and features an uncontrolled spillway with a width of 1 foot. The dam is positioned within the Kansas City District of the US Army Corps of Engineers and falls under the jurisdiction of the state and federal agencies.

Despite not having a condition assessment rating, Fridley Dam remains operational and plays a vital role in water resource management in the area. With its strategic location and purpose, this structure contributes to the overall ecosystem health and water supply sustainability in the region, making it a key asset for water resource and climate enthusiasts to monitor and study.

Year Completed

2001

Dam Length

378

Dam Height

28

River Or Stream

TR- OTTER CREEK

Primary Dam Type

Earth

Surface Area

3.3

Drainage Area

0.11

Nid Storage

38

Hazard Potential

Low

Foundations

Soil

Nid Height

28
       
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.