US Bridges

TR 159B (was or 7) over Drainage Ditch

Good

Iroquois County, Illinois · 0.81 MI Nwof US 24 · Structure no. 038420700000000

Built
1986
39 years old
Condition
Good
inspected September 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
292 ft
3 main spans
Daily traffic
275
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 159B (was or 7) over Drainage Ditch is a prestressed concrete stringer/multi-beam or girder carrying TR 159B (was or 7) over Drainage Ditch in Iroquois County, Illinois. It was built in 1986, so it is 39 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 275 vehicles a day, roughly 26% of them trucks, projected to reach 556 by 2046. The structure is 292 ft (89 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesTR 159B (was or 7)
CrossesDrainage Ditch
Location0.81 MI Nwof US 24
RouteCounty Highway 0
CountyIroquois County
StateIllinois
Coordinates40.7789, -87.77154
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2021
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating87.5 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length292 ft (89 m)
Longest span88 ft (26.8 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2022)
Projected traffic556 by 2046
Trucks26%
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 159B (was or 7) over Drainage Ditch built?

It was built in 1986, making it 39 years old in 2025.

What condition is TR 159B (was or 7) over Drainage Ditch 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 September 2021.

How much traffic does TR 159B (was or 7) over Drainage Ditch carry?

About 275 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is TR 159B (was or 7) over Drainage Ditch?

The structure is 292 ft (89 m) long with a longest span of 88 ft (26.8 m) and a deck 33 ft wide.

Who owns TR 159B (was or 7) over Drainage Ditch?

It is owned by the Town or Township Highway Agency.