Mississippi River Lock And Dam 22 Reservoir Report
Nearby: Daniels Lake Dam Griffith Lake Dam
Last Updated: December 22, 2025
Mississippi River Lock and Dam 22, also known as Pool 22, is a concrete structure located in Ashburn, Missouri, owned and operated by the US Army Corps of Engineers.
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Summary
Completed in 1938, the dam serves primarily for navigation purposes on the Mississippi River, with a length of 3,264 feet and a hydraulic height of 11 feet. It features a single lock with a length of 600 feet and a width of 110 feet, facilitating the movement of vessels along the river.
With a significant hazard potential and moderate risk assessment, the dam is subject to regular inspections and risk management measures by the USACE. These measures include continuous monitoring of the dam's condition, prioritizing activities to mitigate risks, and collaborating with local emergency managers to raise awareness and develop emergency response plans. The USACE also updates the emergency action plan for the dam, performs maintenance and repairs as needed, and prepares inundation maps to address potential flood risks associated with the structure.
In the face of varying water levels and potential weather-related challenges, the Mississippi River Lock and Dam 22 plays a crucial role in managing water flow along the river. By implementing proactive risk management strategies and engaging with local stakeholders, the USACE ensures the safety and functionality of the dam while addressing the complex challenges posed by natural events and maintaining the structural integrity of this vital water resource infrastructure.
Year Completed |
1938 |
Dam Length |
3264 |
River Or Stream |
MISSISSIPPI RIVER |
Primary Dam Type |
Concrete |
Surface Area |
8540 |
Length Of Locks |
600 |
Hydraulic Height |
11 |
Drainage Area |
137500 |
Nid Storage |
80000 |
Structural Height |
32 |
Outlet Gates |
Roller - 3, Tainter (radial) - 9, Uncontrolled - 0 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Salt River Near New London
|
63cfs |
Bear Creek At Hannibal
|
2cfs |
Spencer Cr. Bl Plum Cr. Nr Frankford
|
24cfs |
Salt River Near Center
|
49cfs |
North River At Palmyra
|
13cfs |
Bay Creek At Pittsfield
|
43cfs |
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.
Mississippi River Lock And Dam 22