US Bridges

TR 108 over I-57

Fair

Douglas County, Illinois · 1.25 MI N of Galton · Structure no. 021004600000000

Built
1968
57 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
244 ft
4 main spans
Daily traffic
375
2022 count
Owner
State
State Highway Agency

About this bridge

TR 108 over I-57 is a steel continuous stringer/multi-beam or girder carrying TR 108 over I-57 in Douglas County, Illinois. It was built in 1968, 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 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 375 vehicles a day, roughly 3% of them trucks, projected to reach 303 by 2046. The structure is 244 ft (74.4 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesTR 108
CrossesI-57
Location1.25 MI N of Galton
RouteCounty Highway 0
CountyDouglas County
StateIllinois
Coordinates39.75619, -88.28359
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.2 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length244 ft (74.4 m)
Longest span74 ft (22.6 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic375 (2022)
Projected traffic303 by 2046
Trucks3%
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 108 over I-57 built?

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

What condition is TR 108 over I-57 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 October 2024.

How much traffic does TR 108 over I-57 carry?

About 375 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is TR 108 over I-57?

The structure is 244 ft (74.4 m) long with a longest span of 74 ft (22.6 m) and a deck 30 ft wide.

Who owns TR 108 over I-57?

It is owned by the State Highway Agency.