US Bridges

Dirksen Pkwy (sb) over NS RR & Ic RR

Fair

Sangamon County, Illinois · .5M S Sang Ave · Structure no. 084007300000000

Built
1939
86 years old, rebuilt 1982
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
415 ft
6 main spans
Daily traffic
16,100
2021 count
Owner
State
State Highway Agency

About this bridge

Dirksen Pkwy (sb) over NS RR & Ic RR is a steel continuous stringer/multi-beam or girder carrying Dirksen Pkwy (sb) over NS RR & Ic RR in Sangamon County, Illinois. It was built in 1939 and reconstructed in 1982, so it is 86 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 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 16,100 vehicles a day, roughly 7% of them trucks, projected to reach 8,131 by 2046. The structure is 415 ft (126.6 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesDirksen Pkwy (sb)
CrossesNS RR & Ic RR
Location.5M S Sang Ave
RouteState Highway 29
CountySangamon County
StateIllinois
Coordinates39.82483, -89.60502
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length415 ft (126.6 m)
Longest span102 ft (31.1 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,100 (2021)
Projected traffic8,131 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.1 mi (5 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Dirksen Pkwy (sb) over NS RR & Ic RR built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1982.

What condition is Dirksen Pkwy (sb) over NS RR & Ic RR 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 January 2025.

How much traffic does Dirksen Pkwy (sb) over NS RR & Ic RR carry?

About 16,100 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Dirksen Pkwy (sb) over NS RR & Ic RR?

The structure is 415 ft (126.6 m) long with a longest span of 102 ft (31.1 m) and a deck 31 ft wide.

Who owns Dirksen Pkwy (sb) over NS RR & Ic RR?

It is owned by the State Highway Agency.