Webb Dam Reservoir Report
Last Updated: December 11, 2025
Webb Dam, located in Decatur County, Iowa, was completed in 1978 for fire protection, livestock, and small fish pond purposes.
°F
°F
mph
Wind
%
Humidity
Summary
This earth dam stands at a height of 19 feet and spans 410 feet in length, providing a storage capacity of 52 acre-feet. The dam is regulated by the Iowa Department of Natural Resources and is subject to state permitting, inspection, and enforcement requirements. Despite its low hazard potential, the dam poses a moderate risk, prompting the need for risk management measures.
Managed by a private owner, Webb Dam is situated in the city of Lake La Shane along the TR-Lake La Shane river stream. The dam's design was overseen by the USDA NRCS, and it is only one of the associated structures in the area, with no federal agency ownership or funding attached to it. With a surface area of 3.1 acres and draining 0.26 square miles, the dam serves as a recreational spot in addition to its primary functions. While the dam has not been rated for its condition, it is crucial for enthusiasts and stakeholders to monitor its risk assessment and management strategies.
Despite its relatively low hazard potential, Webb Dam plays a vital role in providing essential services to the local community. With its strategic location and purposeful design, the dam serves as a valuable resource for fire protection, livestock, and recreational activities. As water resource and climate enthusiasts continue to monitor its risk assessment and management, Webb Dam stands as a testament to the importance of responsible dam ownership and maintenance in safeguarding water resources and enhancing environmental resilience.
Year Completed |
1978 |
Dam Length |
410 |
Dam Height |
19 |
River Or Stream |
TR-LAKE LA SHANE |
Primary Dam Type |
Earth |
Surface Area |
3.1 |
Drainage Area |
0.26 |
Nid Storage |
52 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
19 |
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.
Webb Dam
Nine Eagles State Park
Poe Hollow County Park
Shewmaker County Park