US Bridges

Oak Street over Little Rock Creek

Fair

DeKalb County, Illinois · 940N 1650E · Structure no. 019610100000000

Built
1956
69 years old
Condition
Fair
inspected July 2023
Type
Frame
Concrete
Length
58 ft
1 main span
Daily traffic
325
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Oak Street over Little Rock Creek is a concrete frame carrying Oak Street over Little Rock Creek in DeKalb County, Illinois. It was built in 1956, so it is 69 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 325 vehicles a day, roughly 40% of them trucks, projected to reach 364 by 2046. The structure is 58 ft (17.7 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesOak Street
CrossesLittle Rock Creek
Location940N 1650E
RouteCity Street 0
Coordinates41.7684, -88.63826
Functional classRural 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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length58 ft (17.7 m)
Longest span56 ft (17.1 m)
Deck width27 ft (8.1 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic325 (2021)
Projected traffic364 by 2046
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$203,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Oak Street over Little Rock Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Oak Street over Little Rock 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 July 2023.

How much traffic does Oak Street over Little Rock Creek carry?

About 325 vehicles per day (2021 count), of which roughly 40% are trucks.

How long is Oak Street over Little Rock Creek?

The structure is 58 ft (17.7 m) long with a longest span of 56 ft (17.1 m) and a deck 27 ft wide.

Who owns Oak Street over Little Rock Creek?

It is owned by the City or Municipal Highway Agency.