Morr Dam Reservoir Report

Last Updated: December 8, 2025

Morr Dam, also known as Yocum Dam, is a privately owned structure located in Lucas County, Iowa.


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Summary

Built in 1958 by the USDA NRCS, this earth dam stands at a height of 18 feet and stretches 470 feet in length. Its primary purpose is for fire protection, stock, or as a small fish pond, with a storage capacity of 91 acre-feet and a surface area of 6.6 acres.

Situated on the TR-Wolf Creek near Rathbun Reservoir, Morr Dam is regulated by the Iowa Department of Natural Resources and undergoes regular state inspections and enforcement. Despite its low hazard potential and moderate risk assessment, the dam's condition remains unrated, with the last inspection conducted in October 1960. With a drainage area of 0.32 square miles and a maximum discharge capacity of 33 cubic feet per second, this dam plays a crucial role in water resource management in the area.

While Morr Dam may not be a high-profile structure, its significance in providing fire protection and supporting local wildlife cannot be understated. As a key component of the water infrastructure in Lucas County, Iowa, this earth dam serves as a vital resource for the community and highlights the importance of efficient water management practices in the face of changing climate conditions.

Year Completed

1958

Dam Length

470

Dam Height

18

River Or Stream

TR-WOLF CREEK

Primary Dam Type

Earth

Surface Area

6.6

Drainage Area

0.32

Nid Storage

91

Hazard Potential

Low

Foundations

Soil

Nid Height

18
       
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.