US Bridges

TR 108 over Prairie Ck

Fair

Logan County, Illinois · 1 N 2.5 MI E Emden · Structure no. 054530300000000

Built
1972
53 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
50
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 108 over Prairie Ck is a concrete slab carrying TR 108 over Prairie Ck in Logan County, Illinois. It was built in 1972, so it is 53 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 50 vehicles a day, projected to reach 53 by 2046. The structure is 29 ft (8.8 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesTR 108
CrossesPrairie Ck
Location1 N 2.5 MI E Emden
RouteCounty Highway 0
CountyLogan County
StateIllinois
Coordinates40.31249, -89.43909
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.5 US tons
Inventory rating31.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length29 ft (8.8 m)
Longest span27 ft (8.1 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic53 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 108 over Prairie Ck built?

It was built in 1972, making it 53 years old in 2025.

What condition is TR 108 over Prairie Ck 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 December 2024.

How much traffic does TR 108 over Prairie Ck carry?

About 50 vehicles per day (2022 count).

How long is TR 108 over Prairie Ck?

The structure is 29 ft (8.8 m) long with a longest span of 27 ft (8.1 m) and a deck 24 ft wide.

Who owns TR 108 over Prairie Ck?

It is owned by the Town or Township Highway Agency.