Dry Creek Main Reservoir Report
Nearby: Dry Creek Dike Dry Creek Diversion
Last Updated: December 17, 2025
Dry Creek Main, located in Idaho, is a private irrigation dam built in 1976 on the Dry Creek and Big Willow Creek rivers.
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Summary
Standing at a height of 67.81 feet with a storage capacity of 1859.1 acre-feet, this earth dam plays a vital role in the irrigation of surrounding lands. Despite a fair condition assessment, the dam poses a high hazard potential and is regulated by the Idaho Department of Water Resources.
With a spillway width of 300 feet and an uncontrolled spillway type, the dam's infrastructure includes a slide gate for outlet control. The surrounding area covers a surface area of 160 acres and has a drainage area of 2.58 square miles. The last inspection in May 2020 revealed a moderate risk level, prompting the need for a comprehensive risk management plan to ensure the safety and effectiveness of the structure.
Dry Creek Main serves as a critical water resource for agricultural activities in the region, highlighting the importance of maintaining its integrity and functionality. As climate change continues to impact water availability and usage patterns, ensuring the sustainability of dams like Dry Creek Main is essential for supporting the local ecosystem and economy. With proper regulation, inspection, and maintenance, this dam will continue to play a vital role in water management for years to come.
Year Completed |
1976 |
Dam Length |
570 |
Dam Height |
67.81 |
River Or Stream |
DRY CREEK BIG WILLOW CREEK |
Surface Area |
160 |
Hydraulic Height |
62.81 |
Drainage Area |
2.58 |
Nid Storage |
1859.1 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
68 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Payette River Nr Emmett Id
|
1270cfs |
Payette River Nr Letha Id
|
1320cfs |
Weiser River Nr Weiser Id
|
286cfs |
Crane Creek At Mouth Nr Weiser Id
|
6cfs |
Payette River Nr Payette Id
|
1450cfs |
Payette River Nr Horseshoe Bend Id
|
1180cfs |
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.
Dry Creek Main