US Bridges

FAS 931 over Johnson Creek

Good

Johnson County, Illinois · NW1/4 SEC16 T13S R4E · Structure no. 044308100000000

Built
1983
42 years old
Condition
Good
inspected February 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
128 ft
2 main spans
Daily traffic
375
2021 count
Owner
County
County Highway Agency

About this bridge

FAS 931 over Johnson Creek is a prestressed concrete box beam or girders - multiple carrying FAS 931 over Johnson Creek in Johnson County, Illinois. It was built in 1983, so it is 42 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 375 vehicles a day, roughly 5% of them trucks, projected to reach 394 by 2046. The structure is 128 ft (39 m) long and 28 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesFAS 931
CrossesJohnson Creek
LocationNW1/4 SEC16 T13S R4E
RouteCounty Highway 0
Coordinates37.3871, -88.77857
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length128 ft (39 m)
Longest span63 ft (19.2 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic375 (2021)
Projected traffic394 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 931 over Johnson Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is FAS 931 over Johnson 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 2023.

How much traffic does FAS 931 over Johnson Creek carry?

About 375 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is FAS 931 over Johnson Creek?

The structure is 128 ft (39 m) long with a longest span of 63 ft (19.2 m) and a deck 28 ft wide.

Who owns FAS 931 over Johnson Creek?

It is owned by the County Highway Agency.