US Bridges

I-39 SB over Northtown RD TR 201B

Fair

McLean County, Illinois · O.53 MI N of I-55 · Structure no. 057021600000000

Built
1988
37 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
155 ft
1 main span
Daily traffic
6,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 SB over Northtown RD TR 201B is a steel stringer/multi-beam or girder carrying I-39 SB over Northtown RD TR 201B in McLean County, Illinois. It was built in 1988, so it is 37 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 6,750 vehicles a day, roughly 46% of them trucks, projected to reach 6,969 by 2046. The structure is 155 ft (47.1 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-39 SB
CrossesNorthtown RD TR 201B
LocationO.53 MI N of I-55
RouteInterstate 39
CountyMcLean County
StateIllinois
Coordinates40.54686, -89.00281
Functional classUrban Principal Arterial - Interstate

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length155 ft (47.1 m)
Longest span105 ft (32.1 m)
Deck width60 ft (18.4 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,750 (2023)
Projected traffic6,969 by 2046
Trucks46%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-39 SB over Northtown RD TR 201B built?

It was built in 1988, making it 37 years old in 2025.

What condition is I-39 SB over Northtown RD TR 201B 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 February 2025.

How much traffic does I-39 SB over Northtown RD TR 201B carry?

About 6,750 vehicles per day (2023 count), of which roughly 46% are trucks.

How long is I-39 SB over Northtown RD TR 201B?

The structure is 155 ft (47.1 m) long with a longest span of 105 ft (32.1 m) and a deck 60 ft wide.

Who owns I-39 SB over Northtown RD TR 201B?

It is owned by the State Highway Agency.