US Bridges

FAS 946 over Black Creek

Good

Alexander County, Illinois · 1.3 MI S Olive Br · Structure no. 002307200000000

Built
1983
42 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
82 ft
2 main spans
Daily traffic
225
2022 count
Owner
County
County Highway Agency

About this bridge

FAS 946 over Black Creek is a prestressed concrete box beam or girders - multiple carrying FAS 946 over Black Creek in Alexander 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 225 vehicles a day, roughly 13% of them trucks, projected to reach 379 by 2046. The structure is 82 ft (25 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesFAS 946
CrossesBlack Creek
Location1.3 MI S Olive Br
RouteCounty Highway 0
Coordinates37.15104, -89.36128
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating45.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadH 20
Structure length82 ft (25 m)
Longest span40 ft (12.2 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2022)
Projected traffic379 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

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 946 over Black Creek built?

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

What condition is FAS 946 over Black 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 October 2023.

How much traffic does FAS 946 over Black Creek carry?

About 225 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is FAS 946 over Black Creek?

The structure is 82 ft (25 m) long with a longest span of 40 ft (12.2 m) and a deck 28 ft wide.

Who owns FAS 946 over Black Creek?

It is owned by the County Highway Agency.