Enl. Eddie Reservoir Report
Last Updated: December 5, 2025
Enl.
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Summary
Eddie, located in Sheridan, Wyoming, is a privately owned earth dam designed by HUGH LOWHAM and completed in 1953 for flood risk reduction along the Rye Draw river. With a dam height of 30 feet and a hydraulic height of 21 feet, this structure serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The dam has a storage capacity of 68 acre-feet and covers a surface area of 3 acres, with a drainage area of 0.14 square miles.
Despite its low hazard potential and fair condition assessment, Enl. Eddie is regulated by the Wyoming State Engineer's Office (SEO) with state jurisdiction, permitting, inspection, and enforcement in place. The dam features an uncontrolled spillway and one uncontrolled outlet gate. While the risk assessment indicates a moderate risk level, the dam has not undergone recent risk management measures or updates to its emergency action plan. Liz Cheney (R) represents the area in the US Congress, but the dam is not under the jurisdiction of the US Army Corps of Engineers.
Water resource and climate enthusiasts will find Enl. Eddie an interesting case study in dam infrastructure, highlighting the importance of private ownership in maintaining flood risk reduction structures. The dam's historical significance, combined with its multiple purposes and state-regulated status, offer a unique perspective on water management in the region. With its moderate risk level and fair condition, there may be opportunities for further assessment and potential improvements to ensure the long-term safety and effectiveness of Enl. Eddie in mitigating flood risks along the Rye Draw river.
Year Completed |
1953 |
Dam Length |
264 |
Dam Height |
30 |
River Or Stream |
RYE DRAW |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
21 |
Drainage Area |
0.14 |
Nid Storage |
68 |
Structural Height |
33 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Prairie Dog Creek Near Acme
|
19cfs |
Tongue River At State Line Nr Decker Mt
|
195cfs |
Goose Creek Near Acme
|
123cfs |
Tongue River At Monarch
|
383cfs |
Tongue River At Tongue R Dam Nr Decker Mt
|
118cfs |
Tongue River Near Dayton
|
48cfs |
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 |
|---|---|---|
Sheridan KOA
|
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Tongue River Reservoir State Park
|
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Washington Park - Sheridan
|
Enl. Eddie