US Bridges

M-11 over Conrail

Fair

Kent County, Michigan · In Wyoming · Structure no. 000000000004866

Built
1937
88 years old, rebuilt 1998
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
170 ft
3 main spans
Daily traffic
37,247
2007 count
Owner
State
State Highway Agency

About this bridge

M-11 over Conrail is a steel stringer/multi-beam or girder carrying M-11 over Conrail in Kent County, Michigan. It was built in 1937 and reconstructed in 1998, so it is 88 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 37,247 vehicles a day, roughly 4% of them trucks, projected to reach 50,591 by 2018. The structure is 170 ft (51.8 m) long and 75 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-11
CrossesConrail
LocationIn Wyoming
RouteState Highway 11
CountyKent County
StateMichigan
Coordinates42.91322, -85.6759
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 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 geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating71.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span60 ft (18.2 m)
Deck width75 ft (22.9 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,247 (2007)
Projected traffic50,591 by 2018
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.9 mi (3 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-11 over Conrail built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 1998.

What condition is M-11 over Conrail 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-11 over Conrail carry?

About 37,247 vehicles per day (2007 count), of which roughly 4% are trucks.

How long is M-11 over Conrail?

The structure is 170 ft (51.8 m) long with a longest span of 60 ft (18.2 m) and a deck 75 ft wide.

Who owns M-11 over Conrail?

It is owned by the State Highway Agency.