Upper Falls Control Works Reservoir Report
Last Updated: December 14, 2025
Upper Falls Control Works is a private hydroelectric facility located in Spokane, Washington, along the Spokane River.
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Summary
Built in 1922 by Washington Water Power, this gravity dam stands at a height of 23.9 feet and has a storage capacity of 800 acre-feet. With a controlled spillway width of 290 feet and a maximum discharge capacity of 38,000 cubic feet per second, the dam serves as a vital infrastructure for managing water resources in the region.
Operated under the oversight of the Federal Energy Regulatory Commission, Upper Falls Control Works plays a crucial role in generating hydroelectric power and supporting the local ecosystem. Despite its low hazard potential, the dam is subject to regular inspections and maintenance to ensure its structural integrity and operational efficiency. With a risk assessment rating of very high, the facility is equipped with emergency action plans and contingency measures to address any unforeseen events or natural disasters.
As a significant landmark in the area, Upper Falls Control Works stands as a testament to the ingenuity of early 20th-century engineering and the enduring importance of water resource management in shaping the landscape and economy of Washington. From its innovative design to its role in sustainable energy production, this hydroelectric facility continues to be a focal point for water resource and climate enthusiasts interested in the intersection of technology, nature, and human development.
Year Completed |
1922 |
Dam Length |
366 |
Dam Height |
23.9 |
River Or Stream |
Spokane River |
Primary Dam Type |
Gravity |
Surface Area |
150 |
Hydraulic Height |
17.5 |
Drainage Area |
4255 |
Nid Storage |
800 |
Structural Height |
23.9 |
Outlet Gates |
Other Controlled - 2, Vertical Lift - 4 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Spokane River At Spokane
|
17500cfs |
Hangman Creek At Spokane
|
98cfs |
Little Spokane River At Dartford
|
222cfs |
Little Spokane River Near Dartford
|
527cfs |
Spokane River Below Nine Mile Dam At Spokane
|
17300cfs |
Spokane River Nr Post Falls Id
|
19800cfs |
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 Falls Control Works