Renner Reservoir Report

Last Updated: December 5, 2025

Renner is a state-owned irrigation dam located in MANDERSON, Wyoming, along the BUFFALO FLAT CREEK.


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Summary

Built in 1950, Renner is an Earth-type dam with a height of 16 feet and a length of 1050 feet, providing a storage capacity of 584 acre-feet for irrigation purposes. The dam is regulated, inspected, and enforced by the State of Wyoming, ensuring its safety and satisfactory condition.

Despite being classified as having a low hazard potential, Renner is considered to have a moderate risk level, with a risk assessment rating of 3. The dam features an uncontrolled spillway with a width of 85 feet and a slide (sluice gate) outlet gate. The last inspection conducted in April 2020 found the dam to be in satisfactory condition, with an inspection frequency of every 5 years. While an Emergency Action Plan (EAP) is not currently prepared, the dam meets regulatory guidelines and is equipped with emergency contacts.

Located in Big Horn County, Wyoming, Renner serves as a crucial water resource for agricultural activities in the region. With its strategic design and state jurisdiction oversight, Renner stands as a reliable infrastructure supporting the irrigation needs of the local community. Enthusiasts of water resources and climate will find Renner's operational details and risk management measures essential for understanding the sustainable management of water infrastructure in the area.

Year Completed

1950

Dam Length

1050

Dam Height

16

River Or Stream

BUFFALO FLAT CREEK

Primary Dam Type

Earth

Surface Area

70

Hydraulic Height

13

Nid Storage

584

Structural Height

16

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

16
       
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.