Little Wood Res Nr Carey Id Reservoir Report

Last Updated: December 13, 2025

Little Wood Reservoir is located near Carey, Idaho and was completed in 1937 as an irrigation reservoir.


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Summary

It has a capacity of 38,000 acre-feet of water and is fed by the Little Wood River. The reservoir supplies water for irrigation in the surrounding agricultural area and also provides opportunities for recreation such as boating, fishing, and camping. The hydrology of the reservoir is influenced by snowpack in the surrounding mountains, which provides a significant portion of the water supply. Specific surface flow providers include the Little Wood River, which flows into the reservoir, and the Big Wood River, which is fed by the reservoir. The area is also home to a variety of wildlife, including waterfowl and fish species such as rainbow trout and smallmouth bass.

Reservoir Details

24hr Change 0.6%
Percent of Normal 102%
Minimum 416.0
2021-08-07
Maximum 29,940.0
2017-06-22
Average 13,016
Dam_Height 129
Drainage_Area 286
Year_Completed 1941
Nid_Storage 33300
Structural_Height 169
Foundations Rock, Soil
Surface_Area 590
Outlet_Gates Slide (sluice gate) - 0
River_Or_Stream LITTLE WOOD RIVER MALAD RIVER
Dam_Length 3100
Hazard_Potential High
Primary_Dam_Type Earth
Nid_Height 169
       
Seasonal Comparison
Reservoir Storage, Acre-Ft Levels

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.