Basin No. 1 Reservoir Report

Last Updated: December 5, 2025

Basin No.


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Summary

1, also known as the Enl of 6043r, is a privately owned earth dam located in Crook, Wyoming, near the city of HULETT. Completed in 1958, this dam serves multiple purposes including fire protection, stock watering, and small fish pond management. With a height of 20 feet and a hydraulic height of 15 feet, Basin No. 1 has a storage capacity of 210 acre-feet and covers a surface area of 39 acres.

Despite its low hazard potential, Basin No. 1 is currently rated as being in poor condition, according to a recent inspection in April 2021. The dam features an uncontrolled spillway with a width of 35 feet, and no outlet gates for water release. The risk assessment for Basin No. 1 categorizes it as having a moderate risk level (3), indicating the need for potential risk management measures to ensure its continued safety and functionality.

Water resource and climate enthusiasts interested in the maintenance and regulation of dams for various purposes, such as fire protection and wildlife management, may find Basin No. 1 to be a fascinating case study. Its location along Left Creek in Wyoming, its historical significance dating back to the late 1950s, and its current condition and risk assessment provide valuable insights into the challenges and considerations involved in managing and maintaining essential water infrastructure in the face of changing environmental conditions.

Year Completed

1958

Dam Length

420

Dam Height

20

River Or Stream

LEFT CREEK

Primary Dam Type

Earth

Surface Area

39

Hydraulic Height

15

Nid Storage

210

Structural Height

20

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

20
       
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.