Lewis Reservoir Report
Nearby: Nimmo No. 8 Hirsig No. 4
Last Updated: January 6, 2026
Lewis, also known as Carey No.
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Summary
1, is a privately owned irrigation dam located in Laramie, Wyoming, along the Horse Creek. Constructed in 1908, this earth dam stands at 26 feet tall and spans 1100 feet in length, with a storage capacity of 244 acre-feet. The dam's primary purpose is irrigation, serving the surrounding agricultural lands in the region.
Despite being classified as having low hazard potential and fair condition assessment, Lewis is regulated and inspected by the Wyoming State Engineer's Office. The dam features an uncontrolled spillway with a width of 90 feet and three slide gates for outlet control. The last inspection in April 2020 indicated a moderate risk level, prompting the need for continued risk management measures and regular monitoring.
Located in Congressional District 00 of Wyoming, Lewis plays a crucial role in water resource management and agricultural sustainability in the area. With its historical significance and ongoing maintenance efforts, this dam serves as a vital infrastructure component for water supply and irrigation purposes in the region, highlighting the intersection of water resource management and climate resilience.
Year Completed |
1908 |
Dam Length |
1100 |
Dam Height |
26 |
River Or Stream |
HORSE CREEK |
Primary Dam Type |
Earth |
Surface Area |
14 |
Hydraulic Height |
21 |
Nid Storage |
244 |
Structural Height |
26 |
Outlet Gates |
Slide (sluice gate) - 3 |
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.
Lewis