Upper Diversion Dam #1 Reservoir Report
Last Updated: December 19, 2025
Upper Diversion Dam #1, located in Idaho Falls, Idaho, is a gravity dam completed in 1982 with a primary purpose of hydroelectric power generation.
°F
°F
mph
Wind
%
Humidity
Summary
This dam, situated on the Snake River, has a height of 23 feet and a length of 600 feet, providing a storage capacity of 1230 acre-feet. With a maximum discharge rate of 60,000 cubic feet per second, the dam serves as a vital component in the region's water resource management and flood control efforts.
Managed by the Federal Energy Regulatory Commission, Upper Diversion Dam #1 also offers recreational opportunities in addition to its hydroelectric function. The dam features a controlled spillway with a width of 430 feet, ensuring safe and efficient water flow during times of excess. Despite its low hazard potential, the dam is subject to regular inspections to ensure its structural integrity and operational reliability.
With a risk assessment ranking of very high, Upper Diversion Dam #1 underscores the critical importance of proactive risk management measures. As a key infrastructure asset in the region, the dam plays a crucial role in water resource sustainability and climate resilience efforts. Its strategic location and multifaceted functionalities make it a significant contributor to the overall water management framework in the area.
Year Completed |
1982 |
Dam Length |
600 |
Dam Height |
23 |
River Or Stream |
Snake River |
Primary Dam Type |
Gravity |
Surface Area |
100 |
Drainage Area |
9800 |
Nid Storage |
1230 |
Outlet Gates |
Other Controlled - 2 |
Hazard Potential |
Low |
Nid Height |
23 |
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.
Upper Diversion Dam #1