US Bridges

US 45/FAS 317 over Prairie Creek

Good

Iroquois County, Illinois · 0.85 MI N of US 24 · Structure no. 038201500000000

Built
2010
15 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete
Length
33 ft
3 main spans
Daily traffic
1,450
2023 count
Owner
State
State Highway Agency

About this bridge

US 45/FAS 317 over Prairie Creek is a concrete culvert carrying US 45/FAS 317 over Prairie Creek in Iroquois County, Illinois. It was built in 2010, so it is 15 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 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 1,450 vehicles a day, roughly 6% of them trucks, projected to reach 1,364 by 2046. The structure is 33 ft (10.1 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesUS 45/FAS 317
CrossesPrairie Creek
Location0.85 MI N of US 24
RouteU.S. Route 45
CountyIroquois County
StateIllinois
Coordinates40.77898, -87.9782
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.6 US tons
Inventory rating53.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span11 ft (3.3 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,450 (2023)
Projected traffic1,364 by 2046
Trucks6%
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

OwnerState Highway Agency
Maintained byState 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 US 45/FAS 317 over Prairie Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is US 45/FAS 317 over Prairie 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 July 2024.

How much traffic does US 45/FAS 317 over Prairie Creek carry?

About 1,450 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 45/FAS 317 over Prairie Creek?

The structure is 33 ft (10.1 m) long with a longest span of 11 ft (3.3 m) and a deck 32 ft wide.

Who owns US 45/FAS 317 over Prairie Creek?

It is owned by the State Highway Agency.