US Bridges

Sand Prairie Road over I-55/70

Fair

Madison County, Illinois · 1.5 MI E of Ill 111 · Structure no. 060014600000000

Built
1961
64 years old, rebuilt 1995
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
528 ft
9 main spans
Daily traffic
1,700
2024 count
Owner
State
State Highway Agency

About this bridge

Sand Prairie Road over I-55/70 is a steel continuous stringer/multi-beam or girder carrying Sand Prairie Road over I-55/70 in Madison County, Illinois. It was built in 1961 and reconstructed in 1995, so it is 64 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 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 1,700 vehicles a day, roughly 6% of them trucks, projected to reach 1,819 by 2046. The structure is 528 ft (161 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSand Prairie Road
CrossesI-55/70
Location1.5 MI E of Ill 111
CountyMadison County
StateIllinois
Coordinates38.66279, -90.06619
Functional classUrban Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating100.8 US tons
Inventory rating60.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length528 ft (161 m)
Longest span72 ft (21.9 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2024)
Projected traffic1,819 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sand Prairie Road over I-55/70 built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1995.

What condition is Sand Prairie Road over I-55/70 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 August 2024.

How much traffic does Sand Prairie Road over I-55/70 carry?

About 1,700 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Sand Prairie Road over I-55/70?

The structure is 528 ft (161 m) long with a longest span of 72 ft (21.9 m) and a deck 31 ft wide.

Who owns Sand Prairie Road over I-55/70?

It is owned by the State Highway Agency.