Held Watershed Site B-5 Reservoir Report
Last Updated: December 13, 2025
Held Watershed Site B-5, located in Plymouth County, Iowa, is a vital water resource managed by local government authorities.
°F
°F
mph
Wind
%
Humidity
Summary
With a primary purpose of fire protection, stock, or small fish pond, this watershed site also serves flood risk reduction functions. The earth dam, completed in 1965, stands at a height of 24 feet and has a storage capacity of 105 acre-feet.
Situated along the TR-Floyd River, Held Watershed Site B-5 covers a surface area of 10 acres and has a drainage area of 1.7 square miles. Despite its low hazard potential, the site is subject to moderate risk assessment due to its critical location and function. Managed by the Iowa Department of Natural Resources, the state jurisdiction ensures that the dam is regularly inspected, permitted, and enforced to maintain its structural integrity and safety measures.
Climate and water resource enthusiasts will find Held Watershed Site B-5 to be an intriguing case study in sustainable water management and flood control. With its historical significance dating back to the 1960s, this site exemplifies the collaborative efforts between local government, federal agencies like USDA NRCS, and state regulators to safeguard water resources and mitigate flood risks in the region.
Year Completed |
1965 |
Dam Length |
447 |
Dam Height |
24 |
River Or Stream |
TR-FLOYD RIVER |
Primary Dam Type |
Earth |
Surface Area |
10 |
Drainage Area |
1.7 |
Nid Storage |
105 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
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-5