Held Watershed Site B-1 Reservoir Report
Last Updated: December 13, 2025
Held Watershed Site B-1, located in Plymouth County, Iowa, is a local government-owned earth dam completed in 1965 by the USDA NRCS.
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Summary
With a primary purpose of fire protection, stock, or small fish pond, this dam also serves flood risk reduction in the area. The dam stands at a height of 26 feet and has a length of 602 feet, providing a storage capacity of 79 acre-feet and a surface area of 5.3 acres.
Situated on the TR-Floyd River, this dam is regulated by the Iowa DNR and undergoes state permitting, inspection, and enforcement. With a low hazard potential and a moderate risk assessment rating, the dam's condition is currently not rated. While the spillway type is uncontrolled, the dam's drainage area is 0.54 square miles. Despite its age, Held Watershed Site B-1 continues to play a crucial role in water resource management and climate resilience efforts in the region.
As an integral part of the watershed, this dam not only provides essential water storage but also contributes to the overall ecosystem health and water quality of the area. With its strategic location and purposeful design, Held Watershed Site B-1 stands as a testament to sustainable water resource management practices and the importance of community-led initiatives in mitigating the impacts of climate change.
Year Completed |
1965 |
Dam Length |
602 |
Dam Height |
26 |
River Or Stream |
TR-FLOYD RIVER |
Primary Dam Type |
Earth |
Surface Area |
5.3 |
Drainage Area |
0.54 |
Nid Storage |
79 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Floyd River At James
|
187cfs |
Perry Creek Near Milnerville
|
25cfs |
Missouri River At Sioux City
|
15100cfs |
Big Sioux River At Akron
|
816cfs |
Omaha Cr At Homer
|
45cfs |
Little Sioux River At Correctionville
|
327cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Held Watershed Site B-1