US Bridges

M-37 over Mdot RR Corridor

Fair

Grand Traverse County, Michigan · 0.5 MI S of US-31 · Structure no. 000000000003055

Built
1965
60 years old, rebuilt 1997
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
223 ft
3 main spans
Daily traffic
16,500
2024 count
Owner
State
State Highway Agency

About this bridge

M-37 over Mdot RR Corridor is a steel stringer/multi-beam or girder carrying M-37 over Mdot RR Corridor in Grand Traverse County, Michigan. It was built in 1965 and reconstructed in 1997, so it is 60 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 16,500 vehicles a day, roughly 4% of them trucks, projected to reach 18,225 by 2024. The structure is 223 ft (67.9 m) long and 71 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesM-37
CrossesMdot RR Corridor
Location0.5 MI S of US-31
RouteState Highway 37
CountyGrand Traverse County
StateMichigan
Coordinates44.66473, -85.65619
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 6 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length223 ft (67.9 m)
Longest span94 ft (28.7 m)
Deck width71 ft (21.7 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,500 (2024)
Projected traffic18,225 by 2024
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemYes

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-37 over Mdot RR Corridor built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1997.

What condition is M-37 over Mdot RR Corridor 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 October 2024.

How much traffic does M-37 over Mdot RR Corridor carry?

About 16,500 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is M-37 over Mdot RR Corridor?

The structure is 223 ft (67.9 m) long with a longest span of 94 ft (28.7 m) and a deck 71 ft wide.

Who owns M-37 over Mdot RR Corridor?

It is owned by the State Highway Agency.