US Bridges

TR 108 over Tomahawk Creek

Good

LaSalle County, Illinois · E 6th RD N 3510 · Structure no. 050351300000000

Built
1987
38 years old
Condition
Good
inspected June 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
67 ft
3 main spans
Daily traffic
175
2020 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 108 over Tomahawk Creek is a prestressed concrete box beam or girders - multiple carrying TR 108 over Tomahawk Creek in LaSalle County, Illinois. It was built in 1987, so it is 38 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 175 vehicles a day, roughly 11% of them trucks, projected to reach 177 by 2046. The structure is 67 ft (20.4 m) long and 24 ft wide.

Location

Open in Google Maps
CarriesTR 108
CrossesTomahawk Creek
LocationE 6th RD N 3510
RouteCounty Highway 0
CountyLaSalle County
StateIllinois
Coordinates41.44182, -89.04918
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating69.3 US tons
Inventory rating41.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span22 ft (6.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2020)
Projected traffic177 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 108 over Tomahawk Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is TR 108 over Tomahawk Creek 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 2022.

How much traffic does TR 108 over Tomahawk Creek carry?

About 175 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is TR 108 over Tomahawk Creek?

The structure is 67 ft (20.4 m) long with a longest span of 22 ft (6.7 m) and a deck 24 ft wide.

Who owns TR 108 over Tomahawk Creek?

It is owned by the Town or Township Highway Agency.