US Bridges

Skyhawk RD over Unnamed Creek

Good

Williamson County, Illinois · 8 MI SE Carbondale · Structure no. 100318100000000

Built
2013
12 years old
Condition
Good
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
650
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Skyhawk RD over Unnamed Creek is a prestressed concrete box beam or girders - multiple carrying Skyhawk RD over Unnamed Creek in Williamson County, Illinois. It was built in 2013, so it is 12 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 650 vehicles a day, roughly 13% of them trucks, projected to reach 657 by 2046. The structure is 52 ft (15.7 m) long and 24 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesSkyhawk RD
CrossesUnnamed Creek
Location8 MI SE Carbondale
RouteCounty Highway 0
Coordinates37.66151, -89.11678
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 inspectionFebruary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating46.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length52 ft (15.7 m)
Longest span49 ft (14.9 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2021)
Projected traffic657 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Skyhawk RD over Unnamed Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is Skyhawk RD over Unnamed 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 February 2024.

How much traffic does Skyhawk RD over Unnamed Creek carry?

About 650 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is Skyhawk RD over Unnamed Creek?

The structure is 52 ft (15.7 m) long with a longest span of 49 ft (14.9 m) and a deck 24 ft wide.

Who owns Skyhawk RD over Unnamed Creek?

It is owned by the Town or Township Highway Agency.