Larson #1 Wsp Reservoir Report

Last Updated: December 5, 2025

Larson #1 Water Storage Pond (Wsp) is a private water resource structure located in Okeechobee, Florida, designed by the USDA NRCS and completed in 1988.


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Summary

This Earth-type dam has a height of 6 feet and a length of 7300 feet, with a storage capacity of 155 acre-feet and a surface area of 22 acres. Situated along the Kissimmee River, this structure serves multiple purposes and is primarily used for flood control and water storage.

Despite being non-regulated by the state and having a low hazard potential, Larson #1 Wsp is considered to have a moderate risk level. The dam is currently in a 'Not Rated' condition, with the last inspection conducted in June 1994. With 'Other Controlled' outlet gates and an uncontrolled spillway type, the structure poses a moderate risk that requires management measures to ensure its safety and longevity. The risk assessment for Larson #1 Wsp indicates the need for continued monitoring and potentially updating emergency action plans to meet guidelines and mitigate any potential risks.

In conclusion, Larson #1 Water Storage Pond is an important water resource infrastructure in Okeechobee, Florida, designed to manage water levels along the Kissimmee River. While the structure has a low hazard potential, it is crucial to address the moderate risk level and ensure proper maintenance and monitoring to prevent any potential issues. With its significant storage capacity and strategic location, Larson #1 Wsp plays a vital role in water resource management in the region.

Year Completed

1988

Dam Length

7300

Dam Height

6

River Or Stream

KISSIMMEE RIVER - OS

Primary Dam Type

Earth

Surface Area

22

Hydraulic Height

6

Drainage Area

0.07

Nid Storage

155

Structural Height

7

Outlet Gates

Other Controlled

Hazard Potential

Low

Foundations

Soil

Nid Height

7
       
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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.