US Bridges

TR 317 over Cri RR & Im Canal

Good

LaSalle County, Illinois · N.2755 E.1340 · Structure no. 050345300000000

Built
1978
47 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
350 ft
3 main spans
Daily traffic
600
2020 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 317 over Cri RR & Im Canal is a steel continuous stringer/multi-beam or girder carrying TR 317 over Cri RR & Im Canal in LaSalle County, Illinois. It was built in 1978, so it is 47 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 600 vehicles a day, roughly 16% of them trucks, projected to reach 606 by 2046. The structure is 350 ft (106.7 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesTR 317
CrossesCri RR & Im Canal
LocationN.2755 E.1340
RouteCounty Highway 0
CountyLaSalle County
StateIllinois
Coordinates41.3343, -88.89881
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating77.2 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length350 ft (106.7 m)
Longest span115 ft (35.1 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2020)
Projected traffic606 by 2046
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was TR 317 over Cri RR & Im Canal built?

It was built in 1978, making it 47 years old in 2025.

What condition is TR 317 over Cri RR & Im Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does TR 317 over Cri RR & Im Canal carry?

About 600 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is TR 317 over Cri RR & Im Canal?

The structure is 350 ft (106.7 m) long with a longest span of 115 ft (35.1 m) and a deck 30 ft wide.

Who owns TR 317 over Cri RR & Im Canal?

It is owned by the Town or Township Highway Agency.