Upper Locust Creek Watershed Site L-40 Reservoir Report
Last Updated: December 10, 2025
Located in Wayne County, Iowa, the Upper Locust Creek Watershed Site L-40 is a local government-owned structure designed by USDA NRCS to reduce flood risks in the area.
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Summary
Completed in 2007, this earth dam stands at a height of 23 feet and spans a length of 570 feet, with a storage capacity of 155 acre-feet. Situated on the East Fork of Locust Creek, this watershed site plays a crucial role in flood risk reduction for the surrounding area.
Managed by the Iowa DNR, Upper Locust Creek Watershed Site L-40 is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. With a low hazard potential and a not yet rated condition assessment, this structure serves as a key component in managing water resources and climate-related challenges in the region. With a drainage area of 0.54 square miles and a maximum discharge of 362 cubic feet per second, this site plays a vital role in protecting the community from potential flooding events.
Despite its relatively small surface area of 9 acres, Upper Locust Creek Watershed Site L-40 provides essential flood risk reduction benefits to the area. With a primary purpose of flood risk reduction, this structure aligns with the mission of the Natural Resources Conservation Service to promote sustainable water management practices. As a significant infrastructure project in the region, this site underscores the importance of proactive measures in addressing water resource and climate challenges in a collaborative and efficient manner.
Year Completed |
2007 |
Dam Length |
570 |
Dam Height |
23 |
River Or Stream |
E Fork Locust Creek |
Primary Dam Type |
Earth |
Surface Area |
9 |
Drainage Area |
0.54 |
Nid Storage |
155 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
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.
Upper Locust Creek Watershed Site L-40
Corydon Lake