US Bridges

TR 255 over Slough

Good

Perry County, Illinois · 2 MI E of Duquoin · Structure no. 073315500000000

Built
1994
31 years old
Condition
Good
inspected January 2024
Type
Frame
Concrete
Length
26 ft
1 main span
Daily traffic
50
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 255 over Slough is a concrete frame carrying TR 255 over Slough in Perry County, Illinois. It was built in 1994, so it is 31 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 25 by 2046. The structure is 26 ft (7.8 m) long and 26 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesTR 255
CrossesSlough
Location2 MI E of Duquoin
RouteCounty Highway 0
Coordinates38.0019, -89.19557
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length26 ft (7.8 m)
Longest span25 ft (7.5 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic25 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 255 over Slough built?

It was built in 1994, making it 31 years old in 2025.

What condition is TR 255 over Slough 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 255 over Slough carry?

About 50 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is TR 255 over Slough?

The structure is 26 ft (7.8 m) long with a longest span of 25 ft (7.5 m) and a deck 26 ft wide.

Who owns TR 255 over Slough?

It is owned by the Town or Township Highway Agency.