Upper South Dam

Low HazardSatisfactory ConditionEmergency Action Plan: Not Required

Location

StateMichigan
CountyAlpena
Nearest CityLachine
River/StreamThunder Bay
Coordinates45.02400, -83.79100

Physical Characteristics

Dam TypeGravity
NID Height20 ft
Dam Height20 ft
Dam Length350 ft
Year Completed1930 (96 years old)

Storage & Hydraulics

NID Storage55,000 acre-ft
Max Storage55,000 acre-ft
Normal Storage40,100 acre-ft
Surface Area7,000 acres
Drainage Area182 sq mi
Max Discharge4,850 cfs
Spillway TypeControlled

Ownership & Safety

PurposeHydroelectric
Owner TypeNot Listed
Hazard ClassificationLow
Condition AssessmentSatisfactory
Last Inspection09/17/2019
Emergency Action PlanNot Required

Identifiers

NID IDMI00202
Federal IDMI00202
More InfoState Dam Safety Program

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