US Bridges

Ill 159 over I-55/70

Fair

Madison County, Illinois · JCT 70-159 S Mryvlle · Structure no. 060026900000000

Built
1996
29 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
228 ft
2 main spans
Daily traffic
19,700
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 159 over I-55/70 is a steel continuous stringer/multi-beam or girder carrying Ill 159 over I-55/70 in Madison County, Illinois. It was built in 1996, so it is 29 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 5 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 19,700 vehicles a day, roughly 6% of them trucks, projected to reach 17,227 by 2046. The structure is 228 ft (69.5 m) long and 105 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIll 159
CrossesI-55/70
LocationJCT 70-159 S Mryvlle
RouteState Highway 159
CountyMadison County
StateIllinois
Coordinates38.70783, -89.95895
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.8 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length228 ft (69.5 m)
Longest span114 ft (34.7 m)
Deck width105 ft (32 m)
Roadway width98 ft (29.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,700 (2023)
Projected traffic17,227 by 2046
Trucks6%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 159 over I-55/70 built?

It was built in 1996, making it 29 years old in 2025.

What condition is Ill 159 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 April 2023.

How much traffic does Ill 159 over I-55/70 carry?

About 19,700 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Ill 159 over I-55/70?

The structure is 228 ft (69.5 m) long with a longest span of 114 ft (34.7 m) and a deck 105 ft wide.

Who owns Ill 159 over I-55/70?

It is owned by the State Highway Agency.