US Bridges

Bl 55 (old US 66) over I-55

Poor

Logan County, Illinois · Bl 55 Int-Sw Lincoln · Structure no. 054004000000000

Built
1973
52 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
269 ft
2 main spans
Daily traffic
500
2022 count
Owner
State
State Highway Agency

About this bridge

Bl 55 (old US 66) over I-55 is a steel continuous stringer/multi-beam or girder carrying Bl 55 (old US 66) over I-55 in Logan County, Illinois. It was built in 1973, so it is 52 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 500 vehicles a day, roughly 8% of them trucks, projected to reach 394 by 2046. The structure is 269 ft (81.9 m) long and 77 ft wide.

Location

Open in Google Maps
CarriesBl 55 (old US 66)
CrossesI-55
LocationBl 55 Int-Sw Lincoln
CountyLogan County
StateIllinois
Coordinates40.11244, -89.41663
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length269 ft (81.9 m)
Longest span113 ft (34.4 m)
Deck width77 ft (23.5 m)
Roadway width74 ft (22.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2022)
Projected traffic394 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 Bl 55 (old US 66) over I-55 built?

It was built in 1973, making it 52 years old in 2025.

What condition is Bl 55 (old US 66) over I-55 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Bl 55 (old US 66) over I-55 carry?

About 500 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Bl 55 (old US 66) over I-55?

The structure is 269 ft (81.9 m) long with a longest span of 113 ft (34.4 m) and a deck 77 ft wide.

Who owns Bl 55 (old US 66) over I-55?

It is owned by the State Highway Agency.