US Bridges

20 Mile Road over ST Joseph River

Good

Calhoun County, Michigan · 4 MI W of Homer · Structure no. 000000000001357

Built
1996
29 years old
Condition
Good
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
97
1996 count
Owner
County
County Highway Agency

About this bridge

20 Mile Road over ST Joseph River is a prestressed concrete box beam or girders - multiple carrying 20 Mile Road over ST Joseph River in Calhoun County, Michigan. It was built in 1996, so it is 29 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 97 vehicles a day, projected to reach 181 by 2024. The structure is 100 ft (30.4 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries20 Mile Road
CrossesST Joseph River
Location4 MI W of Homer
RouteCounty Highway 0
CountyCalhoun County
StateMichigan
Coordinates42.12757, -84.9049
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating59 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length100 ft (30.4 m)
Longest span100 ft (30.4 m)
Deck width35 ft (10.6 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic97 (1996)
Projected traffic181 by 2024
Trucks—
Lanes on structure2
Traffic directionOne-lane bridge for two-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 20 Mile Road over ST Joseph River built?

It was built in 1996, making it 29 years old in 2025.

What condition is 20 Mile Road over ST Joseph 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 2024.

How much traffic does 20 Mile Road over ST Joseph River carry?

About 97 vehicles per day (1996 count).

How long is 20 Mile Road over ST Joseph River?

The structure is 100 ft (30.4 m) long with a longest span of 100 ft (30.4 m) and a deck 35 ft wide.

Who owns 20 Mile Road over ST Joseph River?

It is owned by the County Highway Agency.