Knapp Dam Reservoir Report

Last Updated: December 7, 2025

Knapp Dam, also known as Knapp Lake Dam, is a private structure located in Kingsville, Missouri, along the South Fork of the Blackwater River.


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Summary

This earth dam, with a height of 37 feet and a length of 450 feet, serves primarily for water supply purposes, with a storage capacity of 44 acre-feet and a surface area of 4 acres. The dam is regulated and inspected by the Missouri Dam and Reservoir Safety Program, ensuring that it meets state safety standards.

Despite its low hazard potential and satisfactory condition assessment, Knapp Dam has a regular inspection frequency of 5 years to uphold its safety and reliability. The last inspection was conducted in August 2011, with the most recent condition assessment taking place in March 2021. The dam features a spillway width of 60 feet and no outlet gates, emphasizing its design for water storage and supply. With its location in Johnson County, Missouri, Knapp Dam contributes to water resource management for the surrounding area.

Enthusiasts of water resources and climate may find Knapp Dam intriguing for its role in water supply management and its design as an earth dam with buttress core types. The dam's association with the South Fork of the Blackwater River highlights its importance in the local watershed, with a drainage area of 60 square miles. As a privately-owned structure with state regulation and enforcement, Knapp Dam showcases the collaboration between private owners and government agencies in ensuring the safety and functionality of critical water infrastructure in Missouri.

Dam Length

450

Dam Height

37

River Or Stream

TR-S FK BLACKWATER RIVER

Surface Area

4

Drainage Area

60

Nid Storage

44

Structural Height

40

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

40
       
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.