US Bridges

FAS 337 over Trib Spring Creek

Fair

Iroquois County, Illinois · 1MI E Thawville · Structure no. 038530100000000

Built
1969
56 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
73 ft
3 main spans
Daily traffic
150
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

FAS 337 over Trib Spring Creek is a prestressed concrete box beam or girders - multiple carrying FAS 337 over Trib Spring Creek in Iroquois County, Illinois. It was built in 1969, so it is 56 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 150 vehicles a day, roughly 43% of them trucks, projected to reach 152 by 2046. The structure is 73 ft (22.3 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesFAS 337
CrossesTrib Spring Creek
Location1MI E Thawville
RouteCounty Highway 0
Coordinates40.67714, -88.09633
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating28.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 15
Structure length73 ft (22.3 m)
Longest span49 ft (14.9 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2022)
Projected traffic152 by 2046
Trucks43%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 FAS 337 over Trib Spring Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is FAS 337 over Trib Spring Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does FAS 337 over Trib Spring Creek carry?

About 150 vehicles per day (2022 count), of which roughly 43% are trucks.

How long is FAS 337 over Trib Spring Creek?

The structure is 73 ft (22.3 m) long with a longest span of 49 ft (14.9 m) and a deck 26 ft wide.

Who owns FAS 337 over Trib Spring Creek?

It is owned by the Town or Township Highway Agency.