US Bridges

Shady Oaks Road over I-39 & US 51

Good

Lee County, Illinois · 3 MI N Lasalle CO LN · Structure no. 052005800000000

Built
1983
42 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
253 ft
2 main spans
Daily traffic
50
2022 count
Owner
State
State Highway Agency

About this bridge

Shady Oaks Road over I-39 & US 51 is a steel continuous stringer/multi-beam or girder carrying Shady Oaks Road over I-39 & US 51 in Lee County, Illinois. It was built in 1983, so it is 42 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 42% of them trucks, projected to reach 101 by 2046. The structure is 253 ft (77.1 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesShady Oaks Road
CrossesI-39 & US 51
Location3 MI N Lasalle CO LN
RouteCounty Highway 0
Coordinates41.67028, -89.05627
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length253 ft (77.1 m)
Longest span128 ft (39.1 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic101 by 2046
Trucks42%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 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 Shady Oaks Road over I-39 & US 51 built?

It was built in 1983, making it 42 years old in 2025.

What condition is Shady Oaks Road over I-39 & US 51 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does Shady Oaks Road over I-39 & US 51 carry?

About 50 vehicles per day (2022 count), of which roughly 42% are trucks.

How long is Shady Oaks Road over I-39 & US 51?

The structure is 253 ft (77.1 m) long with a longest span of 128 ft (39.1 m) and a deck 31 ft wide.

Who owns Shady Oaks Road over I-39 & US 51?

It is owned by the State Highway Agency.