US Bridges

Oak Knoll Road over Flint Creek

Fair

Lake County, Illinois · .1M E of Ridge Rd. · Structure no. 049307600000000

Built
1926
99 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
225
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Oak Knoll Road over Flint Creek is a concrete slab carrying Oak Knoll Road over Flint Creek in Lake County, Illinois. It was built in 1926, so it is 99 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 225 vehicles a day, roughly 8% of them trucks, projected to reach 303 by 2046. The structure is 22 ft (6.7 m) long and 22 ft wide.

Location

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CarriesOak Knoll Road
CrossesFlint Creek
Location.1M E of Ridge Rd.
RouteCity Street 0
CountyLake County
StateIllinois
Coordinates42.16526, -88.19735
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width22 ft (6.8 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2023)
Projected traffic303 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Oak Knoll Road over Flint Creek built?

It was built in 1926, making it 99 years old in 2025.

What condition is Oak Knoll Road over Flint Creek 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 June 2024.

How much traffic does Oak Knoll Road over Flint Creek carry?

About 225 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Oak Knoll Road over Flint Creek?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 22 ft wide.

Who owns Oak Knoll Road over Flint Creek?

It is owned by the City or Municipal Highway Agency.