Little Boxelder No. 1 Reservoir Report

Last Updated: December 5, 2025

Little Boxelder No.


°F

°F

mph

Wind

%

Humidity

Summary

1 is a privately owned earth dam located in Converse, Wyoming, along the Little Box Elder Creek. Built in 1971 for irrigation purposes, this dam stands at a height of 54 feet and has a storage capacity of 1184 acre-feet. Despite its significant hazard potential and poor condition assessment, it continues to serve as a vital water resource for the surrounding area.

With a spillway width of 70 feet and an uncontrolled spillway type, the dam poses a risk that is considered moderate. It is regularly inspected, with the last assessment conducted in July 2018, indicating a need for maintenance and potential safety improvements. Despite these challenges, the dam remains operational and crucial for fire protection, stock watering, and small fish pond purposes in the region.

Concerns about the dam's condition and hazard potential highlight the importance of ongoing monitoring and maintenance to ensure the safety and sustainability of this water resource. Climate enthusiasts and water resource managers alike are urged to stay informed about Little Boxelder No. 1's status and advocate for responsible stewardship of this essential infrastructure.

Year Completed

1971

Dam Length

1075

Dam Height

54

River Or Stream

LITTLE BOX ELDER CREEK

Primary Dam Type

Earth

Surface Area

59

Hydraulic Height

48

Nid Storage

1184

Structural Height

54

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Significant

Foundations

Soil

Nid Height

54
       
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.