US Bridges

US-12 over ST Joseph River

Fair

Hillsdale County, Michigan · In Jonesville · Structure no. 000000000003267

Built
1999
26 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
15,669
2007 count
Owner
State
State Highway Agency

About this bridge

US-12 over ST Joseph River is a prestressed concrete box beam or girders - multiple carrying US-12 over ST Joseph River in Hillsdale County, Michigan. It was built in 1999, so it is 26 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 15,669 vehicles a day, roughly 7% of them trucks, projected to reach 18,984 by 2018. The structure is 45 ft (13.8 m) long and 85 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS-12
CrossesST Joseph River
LocationIn Jonesville
RouteU.S. Route 12
CountyHillsdale County
StateMichigan
Coordinates41.98277, -84.66431
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating79.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length45 ft (13.8 m)
Longest span45 ft (13.6 m)
Deck width85 ft (25.8 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,669 (2007)
Projected traffic18,984 by 2018
Trucks7%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US-12 over ST Joseph River built?

It was built in 1999, making it 26 years old in 2025.

What condition is US-12 over ST Joseph 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 May 2024.

How much traffic does US-12 over ST Joseph River carry?

About 15,669 vehicles per day (2007 count), of which roughly 7% are trucks.

How long is US-12 over ST Joseph River?

The structure is 45 ft (13.8 m) long with a longest span of 45 ft (13.6 m) and a deck 85 ft wide.

Who owns US-12 over ST Joseph River?

It is owned by the State Highway Agency.