South Fork Blackwater River Dam Lt-14 Reservoir Report

Last Updated: December 6, 2025

South Fork Blackwater River Dam Lt-14, also known as T.J.


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Summary

Slack Lake Dam, is a privately owned structure located in Boonville, Missouri. Built in 1981 by the USDA NRCS, this earth dam stands at a height of 25 feet and spans 520 feet in length. With a primary purpose of serving as a Fish and Wildlife Pond, it also aids in Grade Stabilization along the TR-Blackwater River.

This dam has a low hazard potential and a moderate risk assessment rating. Although it is not state-regulated or inspected, it plays a crucial role in the conservation of the surrounding area, providing a storage capacity of 62 acre-feet and covering a surface area of 9 acres. The structure's uncontrolled spillway, with a width of 18 feet, ensures the safe discharge of water during high flow events, contributing to the overall environmental health of the region.

While South Fork Blackwater River Dam Lt-14 may not be subject to regular inspections or have an Emergency Action Plan in place, its presence as a vital component of the local ecosystem highlights the importance of private investment in water resource management. As a key feature in the landscape of Johnson County, Missouri, this dam serves as a testament to the collaborative efforts between private owners and government agencies in safeguarding water resources for future generations.

Year Completed

1981

Dam Length

520

Dam Height

25

River Or Stream

TR-BLACKWATER RIVER

Primary Dam Type

Earth

Surface Area

9

Hydraulic Height

25

Drainage Area

80

Nid Storage

62

Structural Height

27

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

27
       
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.