US Bridges

FAS 1857-CH7 over Prairie Du Rocher CR

Good

Randolph County, Illinois · Prairie Du Rocher · Structure no. 079307200000000

Built
2009
16 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
104 ft
1 main span
Daily traffic
475
2024 count
Owner
County
County Highway Agency

About this bridge

FAS 1857-CH7 over Prairie Du Rocher CR is a prestressed concrete box beam or girders - multiple carrying FAS 1857-CH7 over Prairie Du Rocher CR in Randolph County, Illinois. It was built in 2009, so it is 16 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 475 vehicles a day, roughly 21% of them trucks, projected to reach 657 by 2046. The structure is 104 ft (31.7 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesFAS 1857-CH7
CrossesPrairie Du Rocher CR
LocationPrairie Du Rocher
RouteCounty Highway 0
Coordinates38.08837, -90.09857
Functional classRural Major Collector

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 2023
Inspection intervalevery 24 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating50 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length104 ft (31.7 m)
Longest span101 ft (30.9 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic475 (2024)
Projected traffic657 by 2046
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 FAS 1857-CH7 over Prairie Du Rocher CR built?

It was built in 2009, making it 16 years old in 2025.

What condition is FAS 1857-CH7 over Prairie Du Rocher CR 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 2023.

How much traffic does FAS 1857-CH7 over Prairie Du Rocher CR carry?

About 475 vehicles per day (2024 count), of which roughly 21% are trucks.

How long is FAS 1857-CH7 over Prairie Du Rocher CR?

The structure is 104 ft (31.7 m) long with a longest span of 101 ft (30.9 m) and a deck 30 ft wide.

Who owns FAS 1857-CH7 over Prairie Du Rocher CR?

It is owned by the County Highway Agency.