US Bridges

103rd Ave over M Br Black River

Fair

Allegan County, Michigan · Approx 0.10 MI W of 52nd · Structure no. 000000000000168

Built
1970
55 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
481
2003 count
Owner
County
County Highway Agency

About this bridge

103rd Ave over M Br Black River is a prestressed concrete box beam or girders - multiple carrying 103rd Ave over M Br Black River in Allegan County, Michigan. It was built in 1970, so it is 55 years old, older 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 5 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 481 vehicles a day, roughly 7% of them trucks, projected to reach 962 by 2023. The structure is 28 ft (8.5 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries103rd Ave
CrossesM Br Black River
LocationApprox 0.10 MI W of 52nd
RouteCounty Highway 304
CountyAllegan County
StateMichigan
Coordinates42.44059, -86.05311
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.6 US tons
Inventory rating52.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic481 (2003)
Projected traffic962 by 2023
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 103rd Ave over M Br Black River built?

It was built in 1970, making it 55 years old in 2025.

What condition is 103rd Ave over M Br Black 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 September 2023.

How much traffic does 103rd Ave over M Br Black River carry?

About 481 vehicles per day (2003 count), of which roughly 7% are trucks.

How long is 103rd Ave over M Br Black River?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 33 ft wide.

Who owns 103rd Ave over M Br Black River?

It is owned by the County Highway Agency.