Boulder Lane Reservoir Report

Last Updated: December 5, 2025

Boulder Lane is a privately owned irrigation dam located in Johnson, Wyoming, along the Looney Draw river.


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Summary

Completed in 2007, this Earth-type dam stands at a height of 34 feet and has a storage capacity of 77 acre-feet, primarily used for irrigation purposes. The dam also serves for fire protection, stock watering, and as a small fish pond within a drainage area of 1 square mile.

With a relatively low hazard potential and fair condition assessment, Boulder Lane has a moderate risk level as assessed in 2017. The dam features an uncontrolled spillway with a width of 100 feet and is equipped with one valve as an outlet gate. The structure underwent its last inspection in September 2017 and is subject to regular inspections, enforcement, and permitting by the state regulatory agency to ensure compliance with safety standards. Water resource and climate enthusiasts can appreciate Boulder Lane as a vital infrastructure supporting agricultural activities in the region, while also contributing to local water management and conservation efforts.

Year Completed

2007

Dam Length

324

Dam Height

34

River Or Stream

LOONEY DRAW

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

29

Drainage Area

1

Nid Storage

77

Structural Height

34

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

34
       
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.