US Bridges

146th Ave over S Br Macatawa River

Good

Allegan County, Michigan · Approx 0.25 MI W of 48th · Structure no. 000000000000189

Built
2023
2 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
2,600
2022 count
Owner
County
County Highway Agency

About this bridge

146th Ave over S Br Macatawa River is a prestressed concrete box beam or girders - single or spread carrying 146th Ave over S Br Macatawa River in Allegan County, Michigan. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,600 vehicles a day, roughly 7% of them trucks, projected to reach 3,865 by 2042. The structure is 36 ft (11 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries146th Ave
CrossesS Br Macatawa River
LocationApprox 0.25 MI W of 48th
RouteCounty Highway 386
CountyAllegan County
StateMichigan
Coordinates42.75465, -86.02409
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
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.3 US tons
Inventory rating65.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length36 ft (11 m)
Longest span34 ft (10.3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2022)
Projected traffic3,865 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 146th Ave over S Br Macatawa River built?

It was built in 2023, making it 2 years old in 2025.

What condition is 146th Ave over S Br Macatawa 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 October 2023.

How much traffic does 146th Ave over S Br Macatawa River carry?

About 2,600 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is 146th Ave over S Br Macatawa River?

The structure is 36 ft (11 m) long with a longest span of 34 ft (10.3 m) and a deck 43 ft wide.

Who owns 146th Ave over S Br Macatawa River?

It is owned by the County Highway Agency.