US Bridges

S Avenue over Portage River

Good

Kalamazoo County, Michigan · 0.8 MI N of Indian Lake · Structure no. 000000000004627

Built
2017
8 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
46 ft
1 main span
Daily traffic
1,259
2016 count
Owner
County
County Highway Agency

About this bridge

S Avenue over Portage River is a steel stringer/multi-beam or girder carrying S Avenue over Portage River in Kalamazoo County, Michigan. It was built in 2017, so it is 8 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 1,259 vehicles a day, roughly 5% of them trucks, projected to reach 1,462 by 2056. The structure is 46 ft (14 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesS Avenue
CrossesPortage River
Location0.8 MI N of Indian Lake
RouteCounty Highway 0
CountyKalamazoo County
StateMichigan
Coordinates42.17226, -85.47188
Functional classUrban 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating98.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length46 ft (14 m)
Longest span41 ft (12.5 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,259 (2016)
Projected traffic1,462 by 2056
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 S Avenue over Portage River built?

It was built in 2017, making it 8 years old in 2025.

What condition is S Avenue over Portage 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 September 2023.

How much traffic does S Avenue over Portage River carry?

About 1,259 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is S Avenue over Portage River?

The structure is 46 ft (14 m) long with a longest span of 41 ft (12.5 m) and a deck 34 ft wide.

Who owns S Avenue over Portage River?

It is owned by the County Highway Agency.