US Bridges

TR 185 over Trib Iroquois River

Fair

Iroquois County, Illinois · 3.25W 5S Sheldon · Structure no. 038544200000000

Built
1989
36 years old
Condition
Fair
inspected June 2024
Type
Channel Beam
Concrete
Length
74 ft
3 main spans
Daily traffic
75
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 185 over Trib Iroquois River is a concrete channel beam carrying TR 185 over Trib Iroquois River in Iroquois County, Illinois. It was built in 1989, so it is 36 years old, younger 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 75 vehicles a day, projected to reach 76 by 2046. The structure is 74 ft (22.5 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesTR 185
CrossesTrib Iroquois River
Location3.25W 5S Sheldon
RouteCounty Highway 0
CountyIroquois County
StateIllinois
Coordinates40.76748, -87.64272
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length74 ft (22.5 m)
Longest span24 ft (7.3 m)
Deck width26 ft (8 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic76 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Iroquois River built?

It was built in 1989, making it 36 years old in 2025.

What condition is TR 185 over Trib Iroquois River 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 June 2024.

How much traffic does TR 185 over Trib Iroquois River carry?

About 75 vehicles per day (2022 count).

How long is TR 185 over Trib Iroquois River?

The structure is 74 ft (22.5 m) long with a longest span of 24 ft (7.3 m) and a deck 26 ft wide.

Who owns TR 185 over Trib Iroquois River?

It is owned by the Town or Township Highway Agency.