South Old Quarry Hollow Dam Reservoir Report

Last Updated: December 6, 2025

South Old Quarry Hollow Dam in Missouri is a privately owned structure designed by William K.


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Summary

Beckman and regulated by the Dam and Reservoir Safety Program. This earth and rockfill dam stands at a height of 141 feet and has a maximum storage capacity of 1150 acre-feet, with a normal storage level of 38 acre-feet. The dam, located in Ste. Genevieve County, Missouri, serves as a water resource along the TR-Mississippi River, with a drainage area of 150 square miles.

Despite its low hazard potential and satisfactory condition assessment, South Old Quarry Hollow Dam poses a moderate risk due to its moderate risk assessment rating of 3 on a scale of 1 to 5. The dam has an uncontrolled spillway type with a width of 16 feet, and last underwent inspection in May 2016 with a scheduled inspection frequency of every 5 years. Although no emergency action plan (EAP) has been prepared for the dam, it meets regulatory guidelines and has not been assigned a Dam Safety Action Classification (DSAC) date. Overall, South Old Quarry Hollow Dam presents an intriguing case study for water resource and climate enthusiasts interested in the management and assessment of dams.

Dam Length

885

Dam Height

141

River Or Stream

TR-MISSISSIPPI RIVER

Surface Area

24.7

Hydraulic Height

138

Drainage Area

150

Nid Storage

1150

Structural Height

141

Outlet Gates

None

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

141
       
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.