US Bridges

M-311 (11 Mile Rd) over Kalamazoo River

Good

Calhoun County, Michigan · 1.8 MI S of I-94 · Structure no. 000000000001322

Built
2019
6 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
150 ft
1 main span
Daily traffic
1,100
2019 count
Owner
State
State Highway Agency

About this bridge

M-311 (11 Mile Rd) over Kalamazoo River is a prestressed concrete stringer/multi-beam or girder carrying M-311 (11 Mile Rd) over Kalamazoo River in Calhoun County, Michigan. It was built in 2019, so it is 6 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.

It carries about 1,100 vehicles a day, roughly 2% of them trucks, projected to reach 1,275 by 2039. The structure is 150 ft (45.7 m) long and 42 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesM-311 (11 Mile Rd)
CrossesKalamazoo River
Location1.8 MI S of I-94
RouteState Highway 311
CountyCalhoun County
StateMichigan
Coordinates42.27431, -85.08118
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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 alignment7: Better than present minimum criteria
Operating rating68.9 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length150 ft (45.7 m)
Longest span146 ft (44.6 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2019)
Projected traffic1,275 by 2039
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-311 (11 Mile Rd) over Kalamazoo River built?

It was built in 2019, making it 6 years old in 2025.

What condition is M-311 (11 Mile Rd) over Kalamazoo 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 July 2023.

How much traffic does M-311 (11 Mile Rd) over Kalamazoo River carry?

About 1,100 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is M-311 (11 Mile Rd) over Kalamazoo River?

The structure is 150 ft (45.7 m) long with a longest span of 146 ft (44.6 m) and a deck 42 ft wide.

Who owns M-311 (11 Mile Rd) over Kalamazoo River?

It is owned by the State Highway Agency.