East Yellow Creek L- 40 Reservoir Report
Last Updated: December 24, 2025
East Yellow Creek L-40 is a local government-owned Earth dam located in Linn, Missouri, designed by USDA NRCS.
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Summary
Completed in 2006 for flood risk reduction on the TR-LONG BRANCH river or stream, this dam stands at a height of 25.5 feet with a structural height of 32 feet and a length of 527 feet. With a storage capacity of 78.4 acre-feet and a drainage area of 172.8 square miles, it serves the primary purpose of flood risk reduction.
Despite being categorized with a low hazard potential and a moderate risk assessment rating, the dam has not been assessed for condition rating. The uncontrolled spillway with a width of 24 feet and outlet gates also contribute to its flood risk reduction capabilities. The dam's location in the Rock Island District and its association with Natural Resources Conservation Service highlight the collaborative efforts in managing water resources and climate challenges in the region. While the dam has not been inspected recently, its design and purpose reflect a commitment to safeguarding communities from potential flood events.
Year Completed |
2006 |
Dam Length |
527 |
Dam Height |
25.5 |
River Or Stream |
TR-LONG BRANCH |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
23 |
Drainage Area |
172.8 |
Nid Storage |
78.4 |
Structural Height |
32 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
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.
East Yellow Creek L- 40