Coleman Dam Reservoir Report

Last Updated: December 19, 2025

Coleman Dam, also known as Glen Coleman Dam, is a privately owned structure located in Warrenton, Missouri.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1991, this earth dam stands at a height of 51 feet and stretches 460 feet in length. With a primary purpose of recreation, the dam provides a surface area of 25 acres and a maximum storage capacity of 580 acre-feet.

Managed by the DAM AND RESERVOIR SAFETY PROG in Missouri, Coleman Dam is regulated, permitted, inspected, and enforced by the state authorities. The dam poses a significant hazard potential and has a satisfactory condition assessment as of December 2007. The risk assessment for the dam is moderate, with a DSAC assigned date yet to be determined.

Situated on the TR TO LITTLE SPRING OSAGE CK, Coleman Dam is a significant feature in the St. Charles County landscape. With its uncontrolled spillway and buttress core type, the dam provides both recreational opportunities and necessary water resource management in the region. For water resource and climate enthusiasts, Coleman Dam offers a glimpse into the intricate balance between human development and environmental stewardship.

Year Completed

1991

Dam Length

460

Dam Height

51

River Or Stream

TR TO LITTLE SPRING OSAGE CK

Primary Dam Type

Earth

Surface Area

25

Drainage Area

475

Nid Storage

580

Structural Height

50

Outlet Gates

None

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

51
       
Seasonal Comparison

Weather Forecast

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.