Bagnall Dam Reservoir Report

Last Updated: December 15, 2025

Bagnall Dam, located in Jasper County, Iowa, was completed in 1960 by the USDA NRCS and is privately owned.


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Summary

This earth dam, standing at a height of 26 feet and stretching 341 feet in length, serves multiple purposes including fire protection and as a small fish pond. With a storage capacity of 25 acre-feet and a surface area of 2.8 acres, the dam helps regulate the flow of TR-Alloway Creek.

Despite being classified as having a low hazard potential, Bagnall Dam poses a moderate risk due to its age and lack of recent inspections. The dam is maintained by the Iowa DNR and is subject to state regulations, inspections, and enforcement. With its uncontrolled spillway and soil foundation, the dam remains an important structure for water resource management in the region.

For water resource and climate enthusiasts, Bagnall Dam stands as a testament to the importance of maintaining and monitoring infrastructure to ensure public safety and environmental sustainability. As climate change continues to impact water resources, the role of dams like Bagnall in flood control and water supply management becomes increasingly vital. With proper oversight and maintenance, Bagnall Dam will continue to serve its purpose for years to come.

Year Completed

1960

Dam Length

341

Dam Height

26

River Or Stream

TR-ALLOWAY CREEK

Primary Dam Type

Earth

Surface Area

2.8

Drainage Area

0.1

Nid Storage

25

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
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.
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Area Campgrounds