Deep Creek No 1 Reservoir Report
Nearby: Deep Creek No 2 Salmon Falls
Last Updated: December 14, 2025
Deep Creek No 1, also known as Deep Creek Lower Reservoir, is a privately owned water resource located in Twin Falls, Idaho.
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Summary
This dam was completed in 1911 and serves the primary purpose of storing water for various other uses. Constructed with an earth core and stone foundation, the dam stands at a height of 17.6 feet with a hydraulic height of 13.4 feet. With a storage capacity of 88 acre-feet and a surface area of 19 acres, this reservoir plays a crucial role in supporting the local water supply and ecosystem.
Managed by the Idaho Department of Water Resources, Deep Creek No 1 is regulated, permitted, and inspected to ensure its safety and functionality. The dam has a low hazard potential and is rated in fair condition as of the last assessment in 2019. Its spillway type is uncontrolled, with a width of 6 feet, and it has other controlled outlet gates. Despite its age, the dam continues to meet modern regulatory standards, and measures are in place for risk management and emergency response. Positioned within the Deep Creek Sinks watershed, this reservoir contributes to the overall water management strategy in the region.
Deep Creek No 1 serves as a vital infrastructure for water storage and management in the area, with a moderate risk assessment rating. The dam's association with the Sacramento District of the US Army Corps of Engineers highlights its importance for water resource management at the federal level. With a history dating back over a century, this reservoir remains a key component of the local water supply network and plays a critical role in supporting the surrounding environment and community. As climate change continues to impact water resources, the maintenance and regulation of structures like Deep Creek No 1 will be essential for ensuring water security and resilience in the face of evolving climatic conditions.
Year Completed |
1911 |
Dam Length |
880 |
Dam Height |
17.6 |
River Or Stream |
DEEP CREEK SINKS |
Surface Area |
19 |
Hydraulic Height |
13.4 |
Drainage Area |
81 |
Nid Storage |
88 |
Outlet Gates |
Other Controlled |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
18 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Lud Drexler Park
|
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Lud Drexler Park Campground
|
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Lud Drexler Park - Salmon Reservoir
|
Deep Creek No 1
Salmon River Canal Co Res Nr Rogerson Id
Salmon Falls Creek