US Bridges

Il 156 over Prairie Dulong CR

Fair

Monroe County, Illinois · 2 MI W of Hecker · Structure no. 067003900000000

Built
1994
31 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
341 ft
5 main spans
Daily traffic
2,050
2023 count
Owner
State
State Highway Agency

About this bridge

Il 156 over Prairie Dulong CR is a steel continuous stringer/multi-beam or girder carrying Il 156 over Prairie Dulong CR in Monroe 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 fair condition with a lowest component rating of 6 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 2,050 vehicles a day, roughly 7% of them trucks, projected to reach 2,430 by 2046. The structure is 341 ft (103.8 m) long and 35 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesIl 156
CrossesPrairie Dulong CR
Location2 MI W of Hecker
RouteState Highway 156
CountyMonroe County
StateIllinois
Coordinates38.30546, -90.03646
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.3 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length341 ft (103.8 m)
Longest span76 ft (23.2 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,050 (2023)
Projected traffic2,430 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Il 156 over Prairie Dulong CR built?

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

What condition is Il 156 over Prairie Dulong CR 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 September 2024.

How much traffic does Il 156 over Prairie Dulong CR carry?

About 2,050 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Il 156 over Prairie Dulong CR?

The structure is 341 ft (103.8 m) long with a longest span of 76 ft (23.2 m) and a deck 35 ft wide.

Who owns Il 156 over Prairie Dulong CR?

It is owned by the State Highway Agency.