Yesness Reservoir Report
Last Updated: December 14, 2025
Yesness is a water resource infrastructure located in Natrona, Wyoming, specifically in the city of Casper.
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Summary
This local government-owned structure serves as a Fish and Wildlife Pond, with purposes including Fire Protection, Stock, and Small Fish Pond. Built in 1944, Yesness is an Earth-type dam with a height of 26 feet and a hydraulic height of 21 feet, providing a storage capacity of 53 acre-feet.
Managed by the Wyoming State Regulatory Agency, Yesness has a low hazard potential and is deemed to be in fair condition as of the last assessment in April 2021. The dam has a spillway width of 100 feet and an uncontrolled spillway type. Despite being located on the Eastdale Draw river, the drainage area associated with Yesness is reported as zero, indicating its relatively smaller scale in comparison to other water resource structures in the region. The site is subject to regular inspections every 5 years to ensure its continued safety and functionality.
In conclusion, Yesness serves as an important component of the local water management infrastructure in Natrona County, Wyoming. With its primary purpose of supporting fish and wildlife habitats, as well as providing fire protection and stock water, this dam plays a crucial role in the region's ecosystem and agricultural activities. Despite its moderate risk assessment, ongoing monitoring and maintenance efforts help ensure the continued safety and effectiveness of Yesness for both the environment and the community it serves.
Year Completed |
1944 |
Dam Length |
400 |
Dam Height |
26 |
River Or Stream |
EASTDALE DRAW |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
21 |
Nid Storage |
53 |
Structural Height |
26 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Beartrap - Casper Mountain Park
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Casper KOA Journey
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Lodge Pole
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Rim Campsite 1
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Rim Campsite 4
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Rim Campsite 2
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Yesness
North Platte River