US Bridges

1 1/2 Mile Road over ST Marys River

Good

Chippewa County, Michigan · 0.4 MI W of Whitehead RD · Structure no. 000000000013987

Built
2016
9 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
625 ft
5 main spans
Daily traffic
—
2017 count
Owner
County
County Highway Agency

About this bridge

1 1/2 Mile Road over ST Marys River is a prestressed concrete stringer/multi-beam or girder carrying 1 1/2 Mile Road over ST Marys River in Chippewa County, Michigan. It was built in 2016, so it is 9 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

No traffic count is recorded. The structure is 625 ft (190.5 m) long and 38 ft wide. If it were closed, the detour would be 198.8 mi (320 km).

Location

Open in Google Maps
Carries1 1/2 Mile Road
CrossesST Marys River
Location0.4 MI W of Whitehead RD
RouteCounty Highway 0
CountyChippewa County
StateMichigan
Coordinates46.4837, -84.2893
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadGreater than HL 93
Structure length625 ft (190.5 m)
Longest span123 ft (37.5 m)
Deck width38 ft (11.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic100 by 2037
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed198.8 mi (320 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 1 1/2 Mile Road over ST Marys River built?

It was built in 2016, making it 9 years old in 2025.

What condition is 1 1/2 Mile Road over ST Marys River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does 1 1/2 Mile Road over ST Marys River carry?

No traffic count is recorded for this structure.

How long is 1 1/2 Mile Road over ST Marys River?

The structure is 625 ft (190.5 m) long with a longest span of 123 ft (37.5 m) and a deck 38 ft wide.

Who owns 1 1/2 Mile Road over ST Marys River?

It is owned by the County Highway Agency.