US Bridges

48th Street over Swan Creek

Good

Allegan County, Michigan · Cheshire Twp Sec 7 · Structure no. 000000000000225

Built
1983
42 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
85
2016 count
Owner
County
County Highway Agency

About this bridge

48th Street over Swan Creek is a prestressed concrete box beam or girders - multiple carrying 48th Street over Swan Creek in Allegan County, Michigan. It was built in 1983, so it is 42 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 85 vehicles a day, roughly 7% of them trucks, projected to reach 126 by 2036. The structure is 50 ft (15.2 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Carries48th Street
CrossesSwan Creek
LocationCheshire Twp Sec 7
RouteCounty Highway 0
Coordinates42.48243, -86.00832
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length50 ft (15.2 m)
Longest span50 ft (15.2 m)
Deck width31 ft (9.5 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85 (2016)
Projected traffic126 by 2036
Trucks7%
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

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 48th Street over Swan Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is 48th Street over Swan Creek 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 April 2023.

How much traffic does 48th Street over Swan Creek carry?

About 85 vehicles per day (2016 count), of which roughly 7% are trucks.

How long is 48th Street over Swan Creek?

The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m) and a deck 31 ft wide.

Who owns 48th Street over Swan Creek?

It is owned by the County Highway Agency.