Mississippi River Lock and Dam 9 Quick Facts
Mississippi River Lock and Dam 9 Map
Mississippi River Lock and Dam 9 Information
Mississippi River Lock and Dam 9 is a concrete earth dam located about 12 miles from Prairie Du Chien, Allamakee, Wisconsin.
The dam, which is on the Mississippi River, was primarily built for Navigation purposes, but also serves for Recreation benefits.
The dam was designed by CEMVP and commissioned in 1937 and is currently owned by USACE – St. Paul District.
Mississippi River Lock and Dam 9 Structure
The Mississippi River Lock and Dam 9 is approximately 9,087 feet (2,770 m) long, 18 feet (5 m) high and has a structural volume of 524,200 cubic yards (400,780 cubic metres).
Mississippi River Lock and Dam 9 Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 197,000 acre-ft (242,996 Ml) and maximum capacity of 470,000 acre-ft (579,736 Ml).
The surface area of the reservoir is 29,125 acres (11,786 ha) and the total catchment area is 66,610 square miles (172,519 square kilometres).
Mississippi River Lock and Dam 9 Spillway
The dam has a 680 feet (207 m) wide controlled spillway with a maximum discharge capacity of 278000 cubic feet per second (7872 cubic metres per second).
Mississippi River Lock and Dam 9 Compared to Five Famous American Dams
Mississippi River Lock and Dam 9 Weather
Current Conditions at Mississippi River Lock and Dam 9
Failed to fetch current weather data.7-Day Forecast for Mississippi River Lock and Dam 9
Failed to fetch weather forecast data.Mississippi River Lock and Dam 9 Frequently Asked Questions
Mississippi River Lock and Dam 9 is in Wisconsin.
Mississippi River Lock and Dam 9 is in Allamakee County.
Mississippi River Lock and Dam 9 is 18 feet high.
Mississippi River Lock and Dam 9 is 9,087 feet long.
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Condition Assessment Classification
Satisfactory
No 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
High
Dams 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.
Source: National Inventory of Dams