Held Watershed Site B-6 Reservoir Report
Last Updated: December 13, 2025
Held Watershed Site B-6, located in Plymouth County, Iowa, is a vital structure managed by local government authorities for fire protection, stock maintenance, and small fish pond purposes.
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Summary
Built in 1965 by the USDA NRCS, this earth dam stands at a height of 44 feet and stretches 362 feet in length, providing a storage capacity of 40 acre-feet. Situated along the TR-Floyd River, this dam serves the crucial function of flood risk reduction in the region, with a low hazard potential and a moderate risk assessment score of 3.
The dam, constructed on soil foundation, covers a surface area of 2.8 acres and drains a watershed area of 0.19 square miles. Despite being uncontrolled, the spillway type allows for effective water management in the event of excess inflow. While the condition assessment remains unrated, regular state inspections, permitting, and enforcement ensure the dam's operational integrity and safety. With a dedicated emergency action plan and contingency measures in place, Held Watershed Site B-6 plays a pivotal role in safeguarding the local community and environment from potential water-related risks.
Managed by the Iowa DNR and with a designated state jurisdiction, this watershed site exemplifies sustainable water resource management practices, aligning with climate resilience goals in the region. As part of ongoing efforts to mitigate flood risks and ensure water security, the dam continues to be a focal point for collaboration between local stakeholders, regulatory agencies, and conservation authorities. By leveraging the expertise of the Natural Resources Conservation Service and upholding stringent operational standards, Held Watershed Site B-6 stands as a testament to the importance of proactive water infrastructure management in the face of evolving climatic challenges.
Year Completed |
1965 |
Dam Length |
362 |
Dam Height |
44 |
River Or Stream |
TR-FLOYD RIVER |
Primary Dam Type |
Earth |
Surface Area |
2.8 |
Drainage Area |
0.19 |
Nid Storage |
40 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
44 |
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-6