US Bridges

FAS 531(CH 18) over Two Mile Slough

Good

Champaign County, Illinois · 3.4 MI SW of Savoy · Structure no. 010448800000000

Built
2002
23 years old
Condition
Good
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
74 ft
1 main span
Daily traffic
2,800
2021 count
Owner
County
County Highway Agency

About this bridge

FAS 531(CH 18) over Two Mile Slough is a prestressed concrete box beam or girders - multiple carrying FAS 531(CH 18) over Two Mile Slough in Champaign County, Illinois. It was built in 2002, so it is 23 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 2,800 vehicles a day, roughly 5% of them trucks, projected to reach 2,828 by 2046. The structure is 74 ft (22.6 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesFAS 531(CH 18)
CrossesTwo Mile Slough
Location3.4 MI SW of Savoy
RouteCounty Highway 0
Coordinates40.02541, -88.30706
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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span68 ft (20.6 m)
Deck width33 ft (10.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2021)
Projected traffic2,828 by 2046
Trucks5%
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

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 531(CH 18) over Two Mile Slough built?

It was built in 2002, making it 23 years old in 2025.

What condition is FAS 531(CH 18) over Two Mile Slough 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 January 2024.

How much traffic does FAS 531(CH 18) over Two Mile Slough carry?

About 2,800 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is FAS 531(CH 18) over Two Mile Slough?

The structure is 74 ft (22.6 m) long with a longest span of 68 ft (20.6 m) and a deck 33 ft wide.

Who owns FAS 531(CH 18) over Two Mile Slough?

It is owned by the County Highway Agency.