Blockton Watershed Site J-1 Reservoir Report
Last Updated: December 13, 2025
Blockton Watershed Site J-1 is a vital water resource located in Taylor, Iowa, near the city of Athelstan.
°F
°F
mph
Wind
%
Humidity
Summary
This site is a local government-owned earth dam completed in 1966 by the USDA NRCS, with a primary purpose of providing fire protection, stock, or a small fish pond. The dam stands at a height of 28 feet and spans a length of 698 feet, creating a storage capacity of 249 acre-feet and a surface area of 16.5 acres. It is regulated by the Iowa DNR and serves to reduce flood risks in the area.
The Blockton Watershed Site J-1 is situated along the TR-Platte River and falls under the jurisdiction of the Rock Island District of the USACE. Despite its low hazard potential, the dam is considered to have a moderate risk level and is currently not rated for its condition. With a drainage area of 1.16 square miles, this site plays a crucial role in managing water resources and safeguarding against potential emergencies. For water resource and climate enthusiasts, this site presents an intriguing case study in dam infrastructure and watershed management in the heart of Iowa.
As an essential component of the local water infrastructure, Blockton Watershed Site J-1 offers a fascinating glimpse into the intersection of water resource management, environmental conservation, and climate resilience. With its connection to the Platte River and its role in flood risk reduction, this dam serves as a valuable asset for the community of Athelstan and beyond. For those passionate about water resources and climate adaptation, exploring the design, construction, and regulation of this site provides valuable insights into the challenges and opportunities in managing our natural resources effectively.
Year Completed |
1966 |
Dam Length |
698 |
Dam Height |
28 |
River Or Stream |
TR-PLATTE RIVER |
Primary Dam Type |
Earth |
Surface Area |
16.5 |
Drainage Area |
1.16 |
Nid Storage |
249 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
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 J-1