I-75 NB over Portage ST

Fair Condition66 years old2,555 vehicles/day

Location

StateMichigan
CountyMackinac
LocationIn ST Ignace Portage ST
CarriesI-75 NB
CrossesPortage ST
Coordinates45.86668, -84.73454

Condition Ratings

Overall ConditionFair
Deck6 (Satisfactory)
Superstructure6 (Satisfactory)
Substructure5 (Fair)
Scour CriticalNot applicable

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length137.1 ft (41.8 m)
Max Span56.4 ft (17.2 m)
Deck Width47.2 ft (14.4 m)
Deck Area601.9 sq m
Main Spans3
Year Built1960

Traffic

Avg Daily Traffic2,555 (2007)
Truck Traffic8%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last Inspection423
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number000000000005950

Nearby Bridges

I-75 SB over Portage ST 0.0 mi Fair Us-2|i-75 Bl over I-75 NB 0.7 mi Fair I-75 NB over Cheeseman RD 0.8 mi Poor I-75 SB over Cheeseman RD 0.8 mi Poor I-75 N Appr over Straits Of Mackinac 1.5 mi Fair I-75 over Straits Of Mackinac 2.1 mi Fair I-75 Bl over I-75 NB 2.8 mi Fair Mackinac Trl. Fh41 over Rabbits Back Creek 3.7 mi Fair