Ryan Henschal Watershed Site H-1 Reservoir Report

Last Updated: December 13, 2025

Ryan Henschal Watershed Site H-1, located in Council Bluffs, Iowa, is a vital resource for fire protection, stock, and small fish pond purposes.


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Summary

Built in 1962 by the USDA NRCS, this earth dam stands at a height of 39 feet and spans 451 feet in length, holding a storage capacity of 117 acre-feet. The dam sits on TR-Mosquits Creek, within the Omaha District, offering flood risk reduction benefits to the surrounding area.

Despite its low hazard potential, the dam has not been rated for its condition assessment, indicating a need for further inspection and monitoring. The last inspection was conducted in September 2003, with no reported modifications or interventions since its completion. With its moderate risk assessment score of 3, stakeholders and regulators must ensure that proper risk management measures are in place to safeguard this essential water resource for the community. For water resource and climate enthusiasts, Ryan Henschal Watershed Site H-1 presents an intriguing case study in dam management and the intersection of environmental protection and public safety.

Year Completed

1962

Dam Length

451

Dam Height

39

River Or Stream

TR-MOSQUITS CREEK

Primary Dam Type

Earth

Surface Area

8.7

Drainage Area

0.45

Nid Storage

117

Hazard Potential

Low

Foundations

Soil

Nid Height

39
       
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.