US Bridges

Blackbird Road over Prairie Creek Trib

Good

Franklin County, Illinois · 350N 450E · Structure no. 028339300000000

Built
2007
18 years old
Condition
Good
inspected September 2021
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
27 ft
1 main span
Daily traffic
50
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Blackbird Road over Prairie Creek Trib is a prestressed concrete box beam or girders - multiple carrying Blackbird Road over Prairie Creek Trib in Franklin County, Illinois. It was built in 2007, so it is 18 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 32% of them trucks, projected to reach 76 by 2046. The structure is 27 ft (8.1 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesBlackbird Road
CrossesPrairie Creek Trib
Location350N 450E
RouteCounty Highway 0
Coordinates37.91444, -89.07229
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length27 ft (8.1 m)
Longest span24 ft (7.3 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic76 by 2046
Trucks32%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Blackbird Road over Prairie Creek Trib built?

It was built in 2007, making it 18 years old in 2025.

What condition is Blackbird Road over Prairie Creek Trib 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 2021.

How much traffic does Blackbird Road over Prairie Creek Trib carry?

About 50 vehicles per day (2024 count), of which roughly 32% are trucks.

How long is Blackbird Road over Prairie Creek Trib?

The structure is 27 ft (8.1 m) long with a longest span of 24 ft (7.3 m) and a deck 24 ft wide.

Who owns Blackbird Road over Prairie Creek Trib?

It is owned by the Town or Township Highway Agency.