Mississippi River Lock And Dam 4

Significant HazardNot Available ConditionEmergency Action Plan: Yes

Location

StateWisconsin
CountyWabasha
Nearest CityALMA
River/StreamMISSISSIPPI
Coordinates44.32459, -91.92266

Physical Characteristics

Dam TypeConcrete
NID Height42 ft
Dam Height22 ft
Dam Length7,270 ft
Year Completed1935 (91 years old)

Storage & Hydraulics

NID Storage878,000 acre-ft
Max Storage878,000 acre-ft
Normal Storage590,000 acre-ft
Surface Area38,820 acres
Drainage Area57,100 sq mi
Max Discharge269,000 cfs
Spillway TypeControlled

Ownership & Safety

PurposeNavigation
OwnerUSACE - St. Paul District
Owner TypeFederal
Hazard ClassificationSignificant
Condition AssessmentNot Available
Last Inspection08/08/2022
Emergency Action PlanYes

Identifiers

NID IDWI00727
Federal IDWI00727
More InfoState Dam Safety Program

Nearby Dams

Alma Mill 1 1.9 mi Low Alma Mill 2 2.7 mi Low Alma Mill 3 2.9 mi Low Alma Mill 4 3.1 mi Low Alma Mill 5 3.3 mi Low Alma Mill 6 3.4 mi Low South Nelson 1 3.9 mi Low Garden Valley 10 6.5 mi Low Sheehan-stork Pond 7.3 mi Significant Drysdale Pond 8.1 mi Low