North Logan Det. Dam Reservoir Report
Last Updated: December 15, 2025
North Logan Detention Dam, located in Fremont, Wyoming, is a gravity dam built in 1952 by the Bureau of Land Management for fire protection, stock, and a small fish pond.
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Summary
Situated on the North Logan Draw, this dam has a hydraulic height of 21 feet and a structural height of 25 feet. With a normal storage capacity of 180 acre-feet and a maximum storage of 552.8 acre-feet, the dam covers a surface area of 40.5 acres and spans a length of 845 feet.
Despite its low hazard potential, North Logan Detention Dam is in poor condition according to the last inspection conducted in July 2017. The dam has no outlet gates and features an uncontrolled spillway. While the risk assessment categorizes it as moderate, there is room for improvement in its maintenance and emergency preparedness measures. With Liz Cheney (R) as the Congressional representative for the area, there is an opportunity to address the dam's condition and ensure its continued effectiveness in managing water resources in the region.
Year Completed |
1952 |
Dam Length |
845 |
River Or Stream |
NORTH LOGAN DRAW |
Primary Dam Type |
Gravity |
Surface Area |
40.5 |
Hydraulic Height |
21 |
Nid Storage |
552.8 |
Structural Height |
25 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wind River Ab Boysen Reservoir
|
555cfs |
Little Wind River Near Riverton
|
142cfs |
Wind River At Riverton
|
418cfs |
Fivemile Creek Near Shoshoni
|
38cfs |
Wind R Bl Boysen Res Wyo
|
819cfs |
Sweetwater River Near Sweetwater Station
|
21cfs |
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.
North Logan Det. Dam