US Bridges

TR 185 over Trib to Mackinaw Riv

Good

Tazewell County, Illinois · W.CTR-11-T23NR4W · Structure no. 090322600000000

Built
1997
28 years old
Condition
Good
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
175
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 185 over Trib to Mackinaw Riv is a prestressed concrete box beam or girders - multiple carrying TR 185 over Trib to Mackinaw Riv in Tazewell County, Illinois. It was built in 1997, so it is 28 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 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 175 vehicles a day, roughly 32% of them trucks, projected to reach 202 by 2046. The structure is 76 ft (23.3 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesTR 185
CrossesTrib to Mackinaw Riv
LocationW.CTR-11-T23NR4W
RouteCounty Highway 0
Coordinates40.45952, -89.52511
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length76 ft (23.3 m)
Longest span74 ft (22.7 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2023)
Projected traffic202 by 2046
Trucks32%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 185 over Trib to Mackinaw Riv built?

It was built in 1997, making it 28 years old in 2025.

What condition is TR 185 over Trib to Mackinaw Riv 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 January 2024.

How much traffic does TR 185 over Trib to Mackinaw Riv carry?

About 175 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is TR 185 over Trib to Mackinaw Riv?

The structure is 76 ft (23.3 m) long with a longest span of 74 ft (22.7 m) and a deck 30 ft wide.

Who owns TR 185 over Trib to Mackinaw Riv?

It is owned by the Town or Township Highway Agency.