US Bridges

Southwind RD over I-55

Fair

Sangamon County, Illinois · 1M S I-72/US 36 · Structure no. 084009900000000

Built
1968
57 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
230 ft
4 main spans
Daily traffic
1,750
2022 count
Owner
State
State Highway Agency

About this bridge

Southwind RD over I-55 is a steel continuous stringer/multi-beam or girder carrying Southwind RD over I-55 in Sangamon County, Illinois. It was built in 1968, so it is 57 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 1,750 vehicles a day, roughly 5% of them trucks, projected to reach 1,616 by 2046. The structure is 230 ft (70 m) long and 32 ft wide.

Location

Open in Google Maps
CarriesSouthwind RD
CrossesI-55
Location1M S I-72/US 36
CountySangamon County
StateIllinois
Coordinates39.72827, -89.64427
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length230 ft (70 m)
Longest span71 ft (21.5 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,750 (2022)
Projected traffic1,616 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 Southwind RD over I-55 built?

It was built in 1968, making it 57 years old in 2025.

What condition is Southwind RD over I-55 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 October 2024.

How much traffic does Southwind RD over I-55 carry?

About 1,750 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Southwind RD over I-55?

The structure is 230 ft (70 m) long with a longest span of 71 ft (21.5 m) and a deck 32 ft wide.

Who owns Southwind RD over I-55?

It is owned by the State Highway Agency.