Aikman Reservoir Report
Nearby: Black Canyon Diversion Gatfield No 1
Last Updated: December 19, 2025
Aikman is a privately owned dam located in Gem County, Idaho, along the SOUTH FORK WILLOW CREEK and WILLOW CREEK rivers.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1999 for irrigation purposes, this Earth dam stands at a height of 76.6 feet and has a storage capacity of 2000 acre-feet. Despite its high hazard potential, Aikman is currently in fair condition, with the last inspection conducted in December 2020.
The dam features an uncontrolled spillway with a width of 170 feet and slide gates for outlet control. With a drainage area of 20.3 square miles and a maximum discharge capacity of 825 cubic feet per second, Aikman plays a crucial role in water management and agricultural activities in the region. The risk assessment for Aikman indicates a moderate level of risk, highlighting the importance of ongoing monitoring and maintenance to ensure public safety and water resource sustainability.
Managed by the Idaho Department of Water Resources, Aikman is subject to state regulations and inspections to guarantee its structural integrity and compliance with safety standards. With its strategic location and vital role in irrigation, Aikman serves as a significant asset for water resource management in Gem County, Idaho, contributing to the region's agricultural productivity and environmental sustainability.
Year Completed |
1999 |
Dam Length |
675 |
Dam Height |
76.6 |
River Or Stream |
SOUTH FORK WILLOW CREEK WILLOW CREEK |
Surface Area |
72 |
Hydraulic Height |
67 |
Drainage Area |
20.3 |
Nid Storage |
2000 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
77 |
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.
Aikman