US Bridges

Stroble Road over Prairie River

FairPosted for load

St. Joseph County, Michigan · 2.0 MI W of Centreville · Structure no. 000000000010309

Built
1967
58 years old
Condition
Fair
inspected November 2023
Type
Slab
Wood or Timber
Length
72 ft
3 main spans
Daily traffic
407
2021 count
Owner
County
County Highway Agency

About this bridge

Stroble Road over Prairie River is a wood or timber slab carrying Stroble Road over Prairie River in St. Joseph County, Michigan. It was built in 1967, so it is 58 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. Its operating status is: posted for load restriction.

It carries about 407 vehicles a day, roughly 23% of them trucks, projected to reach 432 by 2041. The structure is 72 ft (21.9 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesStroble Road
CrossesPrairie River
Location2.0 MI W of Centreville
RouteCounty Highway 7835
CountySt. Joseph County
StateMichigan
Coordinates41.91603, -85.56629
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionNovember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating37.8 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span24 ft (7.3 m)
Deck width31 ft (9.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic407 (2021)
Projected traffic432 by 2041
Trucks23%
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 Stroble Road over Prairie River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Stroble Road over Prairie 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 November 2023.

How much traffic does Stroble Road over Prairie River carry?

About 407 vehicles per day (2021 count), of which roughly 23% are trucks.

How long is Stroble Road over Prairie River?

The structure is 72 ft (21.9 m) long with a longest span of 24 ft (7.3 m) and a deck 31 ft wide.

Who owns Stroble Road over Prairie River?

It is owned by the County Highway Agency.