US Bridges

Kilburn Road over Plum Creek

Good

St. Clair County, Michigan · Sec. 30 Grant Twp · Structure no. 000000000010171

Built
2011
14 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
60
2010 count
Owner
County
County Highway Agency

About this bridge

Kilburn Road over Plum Creek is a prestressed concrete box beam or girders - multiple carrying Kilburn Road over Plum Creek in St. Clair County, Michigan. It was built in 2011, so it is 14 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 60 vehicles a day, roughly 7% of them trucks, projected to reach 110 by 2030. The structure is 60 ft (18.3 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesKilburn Road
CrossesPlum Creek
LocationSec. 30 Grant Twp
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates43.10539, -82.62942
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.6 US tons
Inventory rating49.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length60 ft (18.3 m)
Longest span59 ft (17.9 m)
Deck width31 ft (9.5 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2010)
Projected traffic110 by 2030
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Kilburn Road over Plum Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is Kilburn Road over Plum Creek 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 October 2023.

How much traffic does Kilburn Road over Plum Creek carry?

About 60 vehicles per day (2010 count), of which roughly 7% are trucks.

How long is Kilburn Road over Plum Creek?

The structure is 60 ft (18.3 m) long with a longest span of 59 ft (17.9 m) and a deck 31 ft wide.

Who owns Kilburn Road over Plum Creek?

It is owned by the County Highway Agency.