US Bridges

US 20 EB (larkin) over US 20 WB

Fair

Kane County, Illinois · 2.6 M W of Il 31 · Structure no. 045000800000000

Built
1961
64 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
192 ft
3 main spans
Daily traffic
7,200
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 EB (larkin) over US 20 WB is a steel stringer/multi-beam or girder carrying US 20 EB (larkin) over US 20 WB in Kane County, Illinois. It was built in 1961, so it is 64 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 7,200 vehicles a day, roughly 2% of them trucks, projected to reach 10,492 by 2046. The structure is 192 ft (58.6 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 20 EB (larkin)
CrossesUS 20 WB
Location2.6 M W of Il 31
CountyKane County
StateIllinois
Coordinates42.03127, -88.33428
Functional classUrban Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74 US tons
Inventory rating44.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length192 ft (58.6 m)
Longest span75 ft (22.9 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,200 (2023)
Projected traffic10,492 by 2046
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 km)
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 US 20 EB (larkin) over US 20 WB built?

It was built in 1961, making it 64 years old in 2025.

What condition is US 20 EB (larkin) over US 20 WB 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 US 20 EB (larkin) over US 20 WB carry?

About 7,200 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is US 20 EB (larkin) over US 20 WB?

The structure is 192 ft (58.6 m) long with a longest span of 75 ft (22.9 m) and a deck 29 ft wide.

Who owns US 20 EB (larkin) over US 20 WB?

It is owned by the State Highway Agency.