Pinnell Lake Dam Reservoir Report

Last Updated: December 6, 2025

Pinnell Lake Dam, located in Osage City, Missouri, was completed in 1973 with a primary purpose of recreation.


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Summary

This earth dam stands at a height of 25 feet and has a storage capacity of 107 acre-feet. The dam overlooks the TR-Osage River and serves as a popular spot for outdoor enthusiasts seeking recreational activities such as fishing and boating.

Despite its recreational value, Pinnell Lake Dam poses a high hazard potential due to its condition assessment being labeled as "Not Rated." The dam's emergency action plan (EAP) status is also unclear, raising concerns about the readiness and preparedness for potential emergencies. With a drainage area of 315 square miles, the dam plays a crucial role in managing water resources in the region, emphasizing the importance of regular inspections and maintenance to ensure public safety and environmental protection.

As climate change continues to impact water resources, the management and maintenance of dams like Pinnell Lake Dam become increasingly vital. With its location in the St. Louis District and oversight by private owners, the dam's role in water regulation and recreation underscores the need for proactive risk assessment and management measures. As water resource and climate enthusiasts, staying informed about the condition and management of dams like Pinnell Lake Dam is essential for preserving the sustainability and safety of water systems in the face of changing environmental conditions.

Year Completed

1973

Dam Height

25

River Or Stream

TR-OSAGE RIVER

Primary Dam Type

Earth

Surface Area

8

Drainage Area

315

Nid Storage

107

Structural Height

25

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

25
       
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.