US Bridges

TR 1 over I-55

Fair

Montgomery County, Illinois · Sang/Mont CO Line · Structure no. 068010500000000

Built
1971
54 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
356 ft
3 main spans
Daily traffic
125
2020 count
Owner
State
State Highway Agency

About this bridge

TR 1 over I-55 is a steel continuous stringer/multi-beam or girder carrying TR 1 over I-55 in Montgomery County, Illinois. It was built in 1971, so it is 54 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 5 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 125 vehicles a day, roughly 23% of them trucks, projected to reach 126 by 2046. The structure is 356 ft (108.5 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesTR 1
CrossesI-55
LocationSang/Mont CO Line
RouteCounty Highway 0
CountyMontgomery County
StateIllinois
Coordinates39.52402, -89.64636
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionNovember 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 rating81 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 15
Structure length356 ft (108.5 m)
Longest span100 ft (30.4 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2020)
Projected traffic126 by 2046
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 TR 1 over I-55 built?

It was built in 1971, making it 54 years old in 2025.

What condition is TR 1 over I-55 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 November 2024.

How much traffic does TR 1 over I-55 carry?

About 125 vehicles per day (2020 count), of which roughly 23% are trucks.

How long is TR 1 over I-55?

The structure is 356 ft (108.5 m) long with a longest span of 100 ft (30.4 m) and a deck 30 ft wide.

Who owns TR 1 over I-55?

It is owned by the State Highway Agency.