Dump Draw Reservoir Report

Last Updated: December 5, 2025

Dump Draw is a private earth dam located in Buffalo, Wyoming, specifically designed for flood risk reduction along the Dump Draw river.


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Summary

Constructed in 2019, this 42-foot-high dam has a storage capacity of 156 acre-feet and covers a surface area of 7.3 acres. With a spillway width of 60 feet and a maximum discharge capacity of 8,421 cubic feet per second, Dump Draw is equipped to handle high hazard potential events.

Managed by the Wyoming State Engineer's Office, Dump Draw undergoes regular inspections, with the last assessment in April 2020 revealing a satisfactory condition. The dam is designed to meet state regulatory requirements, including permitting, inspection, and enforcement. With its strategic location and efficient design, Dump Draw serves as a crucial infrastructure for protecting the surrounding area from the impacts of flooding, making it a noteworthy site for water resource and climate enthusiasts to explore and study.

Year Completed

2019

Dam Length

580

Dam Height

42

River Or Stream

DUMP DRAW

Primary Dam Type

Earth

Surface Area

7.3

Hydraulic Height

42

Nid Storage

156

Structural Height

42

Outlet Gates

None

Hazard Potential

High

Foundations

Soil

Nid Height

42
       
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.