Blockton Watershed Site S-9 Reservoir Report
Last Updated: December 13, 2025
Blockton Watershed Site S-9, located in the picturesque city of Blockton, Iowa, is a vital water resource managed by the local government for various purposes including fire protection, stock, small fish pond management, flood risk reduction, and recreation.
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Summary
This dam, completed in 1973, stands at a height of 30 feet and has a storage capacity of 255 acre-feet, serving a drainage area of 0.81 square miles along the TR-Platte River. The dam's earth construction and soil foundation make it a reliable structure for water management in the region.
Managed by the Iowa Department of Natural Resources, Blockton Watershed Site S-9 has a low hazard potential and a moderate risk assessment rating. Although the dam's condition is currently not rated, it undergoes regular inspections and enforcement to ensure its integrity and safety. With its uncontrolled spillway and a surface area of 12.3 acres, this site plays a crucial role in water resource management and ecosystem conservation in the area. For water resource and climate enthusiasts, Blockton Watershed Site S-9 offers a fascinating study in sustainable water management practices and the interconnectedness of water resources with local ecosystems.
Year Completed |
1973 |
Dam Length |
610 |
Dam Height |
30 |
River Or Stream |
TR-PLATTE RIVER |
Primary Dam Type |
Earth |
Surface Area |
12.3 |
Drainage Area |
0.81 |
Nid Storage |
255 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Blockton Watershed Site S-9