US Bridges

M-134 over I-75 NB

Fair

Mackinac County, Michigan · @ M-134 · Structure no. 000000000005959

Built
1963
62 years old, rebuilt 2007
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
155 ft
3 main spans
Daily traffic
1,404
2007 count
Owner
State
State Highway Agency

About this bridge

M-134 over I-75 NB is a steel stringer/multi-beam or girder carrying M-134 over I-75 NB in Mackinac County, Michigan. It was built in 1963 and reconstructed in 2007, so it is 62 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,404 vehicles a day, roughly 8% of them trucks, projected to reach 1,907 by 2018. The structure is 155 ft (47.2 m) long and 37 ft wide.

Location

Open in Google Maps
CarriesM-134
CrossesI-75 NB
Location@ M-134
RouteState Highway 134
CountyMackinac County
StateMichigan
Coordinates46.0569, -84.683
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 9 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating83.6 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length155 ft (47.2 m)
Longest span67 ft (20.4 m)
Deck width37 ft (11.2 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,404 (2007)
Projected traffic1,907 by 2018
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was M-134 over I-75 NB built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2007.

What condition is M-134 over I-75 NB in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2024.

How much traffic does M-134 over I-75 NB carry?

About 1,404 vehicles per day (2007 count), of which roughly 8% are trucks.

How long is M-134 over I-75 NB?

The structure is 155 ft (47.2 m) long with a longest span of 67 ft (20.4 m) and a deck 37 ft wide.

Who owns M-134 over I-75 NB?

It is owned by the State Highway Agency.