US Bridges

FAS 787 Boulder RD over Gibbs Creek

Good

Clinton County, Illinois · 1.5 MI S of Boulder · Structure no. 014511500000000

Built
2021
4 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
400
2020 count
Owner
County
County Highway Agency

About this bridge

FAS 787 Boulder RD over Gibbs Creek is a prestressed concrete box beam or girders - multiple carrying FAS 787 Boulder RD over Gibbs Creek in Clinton County, Illinois. It was built in 2021, so it is 4 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 400 vehicles a day, roughly 8% of them trucks, projected to reach 440 by 2046. The structure is 82 ft (25.1 m) long and 30 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesFAS 787 Boulder RD
CrossesGibbs Creek
Location1.5 MI S of Boulder
RouteCounty Highway 0
Coordinates38.6769, -89.22288
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 inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating66.8 US tons
Inventory rating51.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length82 ft (25.1 m)
Longest span80 ft (24.4 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2020)
Projected traffic440 by 2046
Trucks8%
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 787 Boulder RD over Gibbs Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is FAS 787 Boulder RD over Gibbs 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 June 2023.

How much traffic does FAS 787 Boulder RD over Gibbs Creek carry?

About 400 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is FAS 787 Boulder RD over Gibbs Creek?

The structure is 82 ft (25.1 m) long with a longest span of 80 ft (24.4 m) and a deck 30 ft wide.

Who owns FAS 787 Boulder RD over Gibbs Creek?

It is owned by the County Highway Agency.