US Bridges

I-55 (sb) over Il 104 / I & M RR

Poor

Sangamon County, Illinois · 1.5M N Divernon Int · Structure no. 084011000000000

Built
1972
53 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
281 ft
2 main spans
Daily traffic
15,550
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 (sb) over Il 104 / I & M RR is a steel continuous stringer/multi-beam or girder carrying I-55 (sb) over Il 104 / I & M RR in Sangamon County, Illinois. It was built in 1972, so it is 53 years old, older 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 3 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 15,550 vehicles a day, roughly 28% of them trucks, projected to reach 16,463 by 2046. The structure is 281 ft (85.6 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-55 (sb)
CrossesIl 104 / I & M RR
Location1.5M N Divernon Int
RouteInterstate 55
CountySangamon County
StateIllinois
Coordinates39.58964, -89.64641
Functional classRural Principal Arterial - Interstate

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.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length281 ft (85.6 m)
Longest span109 ft (33.2 m)
Deck width67 ft (20.5 m)
Roadway width63 ft (19.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,550 (2023)
Projected traffic16,463 by 2046
Trucks28%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-55 (sb) over Il 104 / I & M RR built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-55 (sb) over Il 104 / I & M RR 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 I-55 (sb) over Il 104 / I & M RR carry?

About 15,550 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is I-55 (sb) over Il 104 / I & M RR?

The structure is 281 ft (85.6 m) long with a longest span of 109 ft (33.2 m) and a deck 67 ft wide.

Who owns I-55 (sb) over Il 104 / I & M RR?

It is owned by the State Highway Agency.