Arsenal Power Reservoir Report
Last Updated: December 13, 2025
Arsenal Power, also known as Structure 160, is a captivating hydroelectric facility located in Rock Island, Illinois, along the picturesque Mississippi River.
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Summary
Owned and operated by the US Army, this concrete dam stands as a testament to engineering excellence since its completion in 1878. With a structural height of 29 feet and a hydraulic height of 16 feet, Arsenal Power serves multiple purposes including hydroelectric power generation and navigation support.
Managed by the US Army, Arsenal Power boasts an impressive capacity with a storage volume of 30,000 acre-feet and a maximum discharge rate of 312,000 cubic feet per second. The dam features a controlled spillway with a width of 10 feet and outlet gates designed for vertical lift operations. Despite its age, Arsenal Power has undergone modifications in 1918 to enhance its structural integrity, ensuring its continued operation and safety. With a low hazard potential and a very high risk assessment rating, the facility remains a vital component of the region's water resource infrastructure.
Visitors and enthusiasts alike can appreciate the historical significance and engineering marvel of Arsenal Power as they explore its location in Rock Island, Illinois. From its multi-arch core type to its rock foundation, the dam stands as a symbol of sustainable water resource management and climate resilience. With state-regulated operations and regular inspections conducted by the US Army, Arsenal Power continues to exemplify the intersection of renewable energy production and environmental stewardship along the majestic Mississippi River.
Years Modified |
1918 - Structural |
Year Completed |
1878 |
Dam Length |
728 |
Dam Height |
26 |
River Or Stream |
Mississippi River |
Primary Dam Type |
Concrete |
Hydraulic Height |
16 |
Nid Storage |
30000 |
Structural Height |
29 |
Outlet Gates |
Vertical Lift |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
29 |
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.
Arsenal Power
12th Street 138, Bettendorf