US Bridges

Main Street over Kalamazoo River

Fair

Allegan County, Michigan · In Plainwell · Structure no. 000000000000325

Built
1992
33 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
300 ft
5 main spans
Daily traffic
9,000
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main Street over Kalamazoo River is a prestressed concrete stringer/multi-beam or girder carrying Main Street over Kalamazoo River in Allegan County, Michigan. It was built in 1992, so it is 33 years old, younger 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 6 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 9,000 vehicles a day, roughly 5% of them trucks, projected to reach 10,000 by 2042. The structure is 300 ft (91.4 m) long and 63 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesMain Street
CrossesKalamazoo River
LocationIn Plainwell
RouteCounty Highway 385
Coordinates42.44521, -85.64185
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.1 US tons
Inventory rating49.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span60 ft (18.2 m)
Deck width63 ft (19.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2022)
Projected traffic10,000 by 2042
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Main Street over Kalamazoo River built?

It was built in 1992, making it 33 years old in 2025.

What condition is Main Street over Kalamazoo River 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 August 2023.

How much traffic does Main Street over Kalamazoo River carry?

About 9,000 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Main Street over Kalamazoo River?

The structure is 300 ft (91.4 m) long with a longest span of 60 ft (18.2 m) and a deck 63 ft wide.

Who owns Main Street over Kalamazoo River?

It is owned by the City or Municipal Highway Agency.