Will Reservoir Report
Nearby: Government No. 1 Stock Marton
Last Updated: December 13, 2025
Located in Johnson, Wyoming, the Will dam stands as a vital structure for fish and wildlife conservation.
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Summary
Constructed in 2008 by designer Hugh Lowham, this Federal-owned earth dam serves multiple purposes including fire protection and small fish pond. With a height of 33 feet and a hydraulic height of 28 feet, the dam spans a length of 432 feet and has a storage capacity of 40 acre-feet.
Despite a low hazard potential and fair condition assessment, the Will dam is subject to regular inspections to ensure its structural integrity. With a drainage area of 0.05 square miles and a maximum discharge of 497 cubic feet per second, this dam plays a crucial role in managing water resources in the region. The dam is regulated by the State of Wyoming, with inspection, enforcement, and permitting carried out by the state regulatory agencies. For water resource and climate enthusiasts, the Will dam represents a key component of environmental conservation efforts in the area.
Year Completed |
2008 |
Dam Length |
432 |
Dam Height |
33 |
River Or Stream |
WILL DRAW |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
28 |
Drainage Area |
0.05 |
Nid Storage |
40 |
Structural Height |
33 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Clear Creek Near Buffalo
|
18cfs |
Powder River At Arvada
|
180cfs |
Wild Horse Creek Near Arvada
|
0cfs |
Rock Creek Near Buffalo
|
70cfs |
Piney Creek At Kearny
|
113cfs |
Powder River At Sussex
|
144cfs |
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.
Will