US Bridges

10 1/2 Mile Road over ST Joseph River

FairPosted for load

Calhoun County, Michigan · 1 MI SW of Burlington · Structure no. 000000000001353

Built
1986
39 years old
Condition
Fair
inspected September 2024
Type
Slab
Wood or Timber
Length
88 ft
3 main spans
Daily traffic
84
1994 count
Owner
County
County Highway Agency

About this bridge

10 1/2 Mile Road over ST Joseph River is a wood or timber slab carrying 10 1/2 Mile Road over ST Joseph River in Calhoun County, Michigan. It was built in 1986, so it is 39 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 84 vehicles a day, roughly 5% of them trucks, projected to reach 157 by 2024. The structure is 88 ft (26.8 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries10 1/2 Mile Road
CrossesST Joseph River
Location1 MI SW of Burlington
RouteCounty Highway 0
CountyCalhoun County
StateMichigan
Coordinates42.09179, -85.09497
Functional classRural Local

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 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating37.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20 + Mod
Structure length88 ft (26.8 m)
Longest span32 ft (9.7 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic84 (1994)
Projected traffic157 by 2024
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 10 1/2 Mile Road over ST Joseph River built?

It was built in 1986, making it 39 years old in 2025.

What condition is 10 1/2 Mile Road 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 September 2024.

How much traffic does 10 1/2 Mile Road over ST Joseph River carry?

About 84 vehicles per day (1994 count), of which roughly 5% are trucks.

How long is 10 1/2 Mile Road over ST Joseph River?

The structure is 88 ft (26.8 m) long with a longest span of 32 ft (9.7 m) and a deck 32 ft wide.

Who owns 10 1/2 Mile Road over ST Joseph River?

It is owned by the County Highway Agency.