Lucas Co. Grade Stab. Reservoir Report

Last Updated: December 8, 2025

Lucas Co.


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Summary

Grade Stab., located in Lucas County, Iowa, is a privately owned earth dam completed in 1981 by SCS. The dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 26 feet and a length of 488 feet, Lucas Co. Grade Stab. has a storage capacity of 68 acre-feet and covers a surface area of 2.7 acres.

Managed by the Iowa Department of Natural Resources, Lucas Co. Grade Stab. is regulated and inspected regularly to ensure its structural integrity and safety. The dam has a low hazard potential and a moderate risk assessment score of 3. Despite not being rated for condition assessment, the dam meets state permitting and enforcement requirements, making it a crucial structure for water resource management in the region.

Located in the city of Red Rock Reservoir, Lucas Co. Grade Stab. is situated along the TR-Stony Fork river/stream. With a state-regulated status and a primary purpose of flood risk reduction, this dam plays a vital role in protecting the surrounding area from potential water-related emergencies. Water resource and climate enthusiasts can appreciate the significance of Lucas Co. Grade Stab. in ensuring water security and environmental resilience in Lucas County, Iowa.

Year Completed

1981

Dam Length

488

Dam Height

26

River Or Stream

TR- STONY FORK

Primary Dam Type

Earth

Surface Area

2.7

Drainage Area

0.42

Nid Storage

68

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
Seasonal Comparison

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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.