Site 120 - Branson Sp Dam Reservoir Report

Last Updated: December 5, 2025

Site 120, also known as Branson Sp Dam, is a vital flood risk reduction structure located in Douglass, Kansas.


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Summary

Built in 1973 by the USDA NRCS, this earth dam stands at a height of 33 feet and has a storage capacity of 800 acre-feet. The dam's primary purpose is to protect the area from the potential devastation of flooding, particularly along the Four Mile Creek-TR.

With a low hazard potential and a moderate risk assessment rating, Site 120 is a crucial piece of infrastructure in Butler County, Kansas. Managed by the local government and regulated by the Kansas Department of Agriculture, the dam is regularly inspected and maintained to ensure its effectiveness in flood risk reduction. Despite its uncontrolled spillway type, Site 120 has a spillway width of 50 feet, ready to handle a maximum discharge of 100 cfs in times of high water flow. For water resource and climate enthusiasts, this dam serves as a fascinating example of how engineering and nature can work together to protect communities from the forces of nature.

Year Completed

1973

Dam Length

1290

Dam Height

33

River Or Stream

FOUR MILE CREEK-TR

Primary Dam Type

Earth

Surface Area

15.8

Hydraulic Height

23

Nid Storage

800

Structural Height

33

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

33
       
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.