Hirsig No. 4 Reservoir Report
Nearby: Hirsig No. 2 Hirsig No. 1
Last Updated: December 5, 2025
Hirsig No.
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Summary
4 is a privately owned dam located in Hawk Springs, Wyoming, along the North Bear Creek. Built in 1974 by designer J.H. Coffman, this earth dam stands at 27 feet high with a hydraulic height of 22 feet and a structural height of 32 feet. With a primary purpose of serving as a Fish and Wildlife Pond, it also supports irrigation activities in the area.
The dam has a storage capacity of 58 acre-feet and covers a surface area of 5 acres, with a drainage area of 2.6 square miles. It features an uncontrolled spillway with a width of 100 feet and is equipped with a slide (sluice gate) outlet. Despite being classified with a low hazard potential, the dam's condition assessment is rated as poor, indicating a need for improvement and maintenance to ensure its structural integrity and safety.
Given its moderate risk level and the last inspection date in August 2019, stakeholders and regulators need to prioritize the assessment and management of potential hazards associated with Hirsig No. 4. With its importance for fish and wildlife conservation and irrigation, proactive measures must be taken to address the dam's poor condition and minimize risks to the surrounding community and environment.
Year Completed |
1974 |
Dam Length |
520 |
Dam Height |
27 |
River Or Stream |
NORTH BEAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Hydraulic Height |
22 |
Drainage Area |
2.6 |
Nid Storage |
58 |
Structural Height |
32 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Sybille Creek Ab Mule Creek
|
143cfs |
Sybille Creek Ab Canal No. 3
|
93cfs |
Crow Creek At 19th Street
|
3cfs |
Laramie River Near Bosler
|
1950cfs |
Laramie River At Laramie
|
48cfs |
Laramie River Near Fort Laramie
|
41cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Hirsig No. 4