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Mississippi River Lock and Dam 9

Wisconsin — Allamakee County — MISSISSIPPI RIVER

Location

StateWisconsin
CountyAllamakee
RiverMISSISSIPPI RIVER
Coordinates43.21223, -91.10015

Physical Characteristics

NID Height46 ft
Dam Height18 ft
Dam Length9,087 ft
NID Storage470,000 acre-ft
Max Storage470,000 acre-ft
Surface Area29,125 acres

Safety Classification

Hazard PotentialSignificant
Condition AssessmentNot Available
EAP StatusYes
Last InspectionSeptember 18, 2019
Inspection Frequency5

Dam Information

Year Completed1937
Primary PurposeNavigation
Dam TypeConcrete
Owner TypeFederal
OwnerUSACE - St. Paul District
Other NameLock & Dam 9 (Winthrop Rockfeller)

Location Map

About This Dam Record

Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.

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