Harry L. Wolff No. 1 Reservoir Report

Last Updated: December 9, 2025

Harry L.


°F

°F

mph

Wind

%

Humidity

Summary

Wolff No. 1 is a privately owned dam located in Campbell, Wyoming, along the Gap Butte Draw. Built in 1999, this earth dam stands at a height of 27 feet and serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a storage capacity of 41 acre-feet and a surface area of 2.7 acres, this dam plays a crucial role in water resource management in the area.

Managed by the Wyoming State Engineer's Office, Harry L. Wolff No. 1 has a low hazard potential and is considered to be in fair condition as of its last inspection in June 2019. The dam has a spillway type of uncontrolled with a width of 11 feet and a maximum discharge capacity of 590 cubic feet per second. Despite its moderate risk assessment rating, the dam's risk management measures and emergency action plan status are currently unclear, highlighting the importance of ongoing monitoring and maintenance for water resource and climate enthusiasts.

Located in a scenic area near Union Chappel Road, Harry L. Wolff No. 1 is a valuable asset for the local community in terms of water storage and management. As one of the key structures in the region, it provides essential services for fire protection, livestock, and recreational activities. With its strategic location and design, this dam showcases the importance of sustainable water resource practices in mitigating potential risks and ensuring the long-term viability of water sources in the area.

Year Completed

1999

Dam Length

435

Dam Height

27

River Or Stream

GAP BUTTE DRAW

Primary Dam Type

Earth

Surface Area

2.7

Hydraulic Height

22

Drainage Area

0.05

Nid Storage

41

Structural Height

35

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

35
       
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.