Lost Creek Watershed Site C-2 Reservoir Report

Last Updated: December 5, 2025

Lost Creek Watershed Site C-2, also known as Lost Creek Watershed Site C-2 Dam, is a local government-owned structure located in Newton County, Missouri.


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Summary

Designed by the USDA NRCS, this earth dam stands at 55 feet tall and stretches 800 feet in length, serving primarily for flood risk reduction along the tributary of Little Lost Creek. Completed in 1992, the dam has a storage capacity of 88 acre-feet and covers a surface area of 13 acres, with a drainage area of 1685 acres.

The dam features a stone core and rests on a rock foundation, with a spillway type of uncontrolled and a slide (sluice gate) outlet gate. Despite its high hazard potential, Lost Creek Watershed Site C-2 is reported to be in satisfactory condition as of the last assessment in 2007. Regular inspections are conducted every two years, with the most recent being in January 2012. Although the risk assessment categorizes it as moderate, the dam remains a crucial structure for managing flood risks in the Seneca area, highlighting the importance of ongoing monitoring and maintenance efforts to ensure its continued effectiveness and safety.

Year Completed

1992

Dam Length

800

Dam Height

55

River Or Stream

TRIBUTARY, LITTLE LOST CREEK

Primary Dam Type

Earth

Surface Area

13

Drainage Area

1685

Nid Storage

88

Structural Height

55

Outlet Gates

Slide (sluice gate)

Hazard Potential

High

Foundations

Rock

Nid Height

55
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.