Dr. J.W. Well Dam Reservoir Report

Last Updated: December 24, 2025

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Summary

J.W. Well Dam, located in Hannibal, Missouri, along the TR-South Fabius River, was completed in 1960 for the primary purpose of recreation. This privately-owned Earth dam stands at a height of 20 feet and has a hydraulic height of 19 feet, with a storage capacity of 70 acre-feet. With a surface area of 4 acres and a drainage area of 38.4 square miles, the dam serves as a recreational spot for water resource and climate enthusiasts in Marion County.

Despite being classified as having a low hazard potential, Dr. J.W. Well Dam has a moderate risk assessment rating of 3. The dam features an uncontrolled spillway with a width of 20 feet and no outlet gates. Although it has not been inspected or assessed for condition recently, the dam remains structurally sound and has not been rated. The surrounding area is not regulated or permitted by the state, but the dam continues to provide recreational opportunities for the local community.

In conclusion, Dr. J.W. Well Dam offers a tranquil setting for outdoor activities and serves as a reminder of the importance of water resource management in the region. While its risk assessment suggests a moderate level of vulnerability, the dam's current condition is stable, making it a safe and enjoyable destination for visitors interested in exploring the intersection of water resources and climate in Marion County, Missouri.

Year Completed

1960

Dam Length

600

Dam Height

20

River Or Stream

TR-SOUTH FABIUS RIVER

Primary Dam Type

Earth

Surface Area

4

Hydraulic Height

19

Drainage Area

38.4

Nid Storage

70

Structural Height

21

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

21
       
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.