US Bridges

Ill 155 over Prairie Du Rocher CR

Poor

Randolph County, Illinois · Near Wcl P Du Rocher · Structure no. 079004000000000

Built
1990
35 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
222 ft
3 main spans
Daily traffic
100
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 155 over Prairie Du Rocher CR is a prestressed concrete stringer/multi-beam or girder carrying Ill 155 over Prairie Du Rocher CR in Randolph County, Illinois. It was built in 1990, so it is 35 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 100 vehicles a day, roughly 15% of them trucks, projected to reach 202 by 2046. The structure is 222 ft (67.7 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesIll 155
CrossesPrairie Du Rocher CR
LocationNear Wcl P Du Rocher
RouteState Highway 155
CountyRandolph County
StateIllinois
Coordinates38.07913, -90.10436
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74.3 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length222 ft (67.7 m)
Longest span92 ft (28 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic202 by 2046
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Ill 155 over Prairie Du Rocher CR built?

It was built in 1990, making it 35 years old in 2025.

What condition is Ill 155 over Prairie Du Rocher CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does Ill 155 over Prairie Du Rocher CR carry?

About 100 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Ill 155 over Prairie Du Rocher CR?

The structure is 222 ft (67.7 m) long with a longest span of 92 ft (28 m) and a deck 33 ft wide.

Who owns Ill 155 over Prairie Du Rocher CR?

It is owned by the State Highway Agency.