US Bridges

Ch 20(FAS 1660) over I-70

Fair

Clark County, Illinois · 3.5 MI W State Line · Structure no. 012003000000000

Built
1968
57 years old, rebuilt 2002
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
228 ft
4 main spans
Daily traffic
400
2021 count
Owner
State
State Highway Agency

About this bridge

Ch 20(FAS 1660) over I-70 is a steel continuous stringer/multi-beam or girder carrying Ch 20(FAS 1660) over I-70 in Clark County, Illinois. It was built in 1968 and reconstructed in 2002, so it is 57 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 400 vehicles a day, roughly 9% of them trucks, projected to reach 404 by 2046. The structure is 228 ft (69.4 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCh 20(FAS 1660)
CrossesI-70
Location3.5 MI W State Line
RouteCounty Highway 0
CountyClark County
StateIllinois
Coordinates39.42546, -87.60129
Functional classRural Major 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.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length228 ft (69.4 m)
Longest span70 ft (21.4 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2021)
Projected traffic404 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ch 20(FAS 1660) over I-70 built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2002.

What condition is Ch 20(FAS 1660) over I-70 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 June 2024.

How much traffic does Ch 20(FAS 1660) over I-70 carry?

About 400 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is Ch 20(FAS 1660) over I-70?

The structure is 228 ft (69.4 m) long with a longest span of 70 ft (21.4 m) and a deck 30 ft wide.

Who owns Ch 20(FAS 1660) over I-70?

It is owned by the State Highway Agency.