US Bridges

County Line RD over I 90

Fair

Boone County, Illinois · Mc Henry CO Line · Structure no. 004992400000000

Built
2014
11 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
249 ft
2 main spans
Daily traffic
250
2017 count
Owner
Toll Authority
State Toll Authority

About this bridge

County Line RD over I 90 is a concrete continuous stringer/multi-beam or girder carrying County Line RD over I 90 in Boone County, Illinois. It was built in 2014, so it is 11 years old, younger 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 250 vehicles a day, roughly 12% of them trucks, projected to reach 260 by 2046. The structure is 249 ft (75.9 m) long and 35 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Line RD
CrossesI 90
LocationMc Henry CO Line
RouteCounty Highway 0
CountyBoone County
StateIllinois
Coordinates42.20481, -88.70557
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length249 ft (75.9 m)
Longest span125 ft (38.1 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2017)
Projected traffic260 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 County Line RD over I 90 built?

It was built in 2014, making it 11 years old in 2025.

What condition is County Line RD over I 90 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 July 2024.

How much traffic does County Line RD over I 90 carry?

About 250 vehicles per day (2017 count), of which roughly 12% are trucks.

How long is County Line RD over I 90?

The structure is 249 ft (75.9 m) long with a longest span of 125 ft (38.1 m) and a deck 35 ft wide.

Who owns County Line RD over I 90?

It is owned by the State Toll Authority.