Bast No. 1 Stock Reservoir Report

Last Updated: December 13, 2025

Bast No.


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Summary

1 Stock is a privately owned dam located in Niobrara, Wyoming, near the city of Edgemont SD. Built in 1968, this earth dam serves multiple purposes including fire protection, stock watering, and small fish pond habitat. With a structural height of 29 feet and a length of 505 feet, the dam holds a maximum storage capacity of 49 acre-feet and covers a surface area of 4 acres.

Managed by the Wyoming State Engineer's Office, Bast No. 1 Stock is classified as a low hazard potential structure with a fair condition assessment as of the last inspection in July 2020. The dam has a moderate risk assessment rating, indicating a moderate level of risk associated with its operation and potential impact in the event of failure. Despite being uncontrolled, the dam features a spillway width of 310 feet to safely release excess water during periods of high flow.

Though the dam has not been significantly modified over the years and has no associated structures, it plays a crucial role in water resource management in the region. Enthusiasts of water resources and climate monitoring will find Bast No. 1 Stock an interesting case study in dam engineering and maintenance practices.

Year Completed

1968

Dam Length

505

Dam Height

29

River Or Stream

CANYON CREEK DRAW

Primary Dam Type

Earth

Surface Area

4

Hydraulic Height

24

Nid Storage

49

Structural Height

29

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

29
       
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.