Held Watershed Site B-2 Reservoir Report
Last Updated: December 13, 2025
Held Watershed Site B-2 is a crucial water resource located in Plymouth, Iowa, along the TR-Floyd River.
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Summary
Managed by the local government, this site serves multiple purposes including fire protection, stock, and small fish pond use, as well as flood risk reduction. Constructed in 1965 by the USDA NRCS, this earth dam stands at a height of 43 feet and has a storage capacity of 62 acre-feet.
With a low hazard potential and a moderate risk assessment, Held Watershed Site B-2 plays a significant role in water management and conservation efforts in the region. Although the dam's condition assessment is not rated, its importance for the community's water supply and environmental health cannot be understated. With state regulation, inspection, and enforcement in place, this site ensures the safety and sustainability of the surrounding ecosystem, making it an essential component of the local water infrastructure.
As a site that meets state permitting and inspection requirements, Held Watershed Site B-2 demonstrates a commitment to responsible water resource management. Its location and design, in collaboration with the Natural Resources Conservation Service, highlight the importance of sustainable practices in maintaining water quality and quantity for the community. With a history dating back to the 1960s, this site continues to serve as a vital resource for both water supply and environmental protection in the region.
Year Completed |
1965 |
Dam Length |
370 |
Dam Height |
43 |
River Or Stream |
TR-FLOYD RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.1 |
Drainage Area |
0.41 |
Nid Storage |
62 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
43 |
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-2
Bacon Creek Sioux City