US Bridges

US 34 over Little Rock Creek

Good

DeKalb County, Illinois · 1.1 MI E Dekalb Co. · Structure no. 047006100000000

Built
2004
21 years old
Condition
Good
inspected February 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
142 ft
3 main spans
Daily traffic
11,600
2023 count
Owner
State
State Highway Agency

About this bridge

US 34 over Little Rock Creek is a prestressed concrete stringer/multi-beam or girder carrying US 34 over Little Rock Creek in DeKalb County, Illinois. It was built in 2004, so it is 21 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 11,600 vehicles a day, roughly 5% of them trucks, projected to reach 15,827 by 2046. The structure is 142 ft (43.3 m) long and 59 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesUS 34
CrossesLittle Rock Creek
Location1.1 MI E Dekalb Co.
RouteU.S. Route 34
Coordinates41.65049, -88.58118
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.4 US tons
Inventory rating55 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length142 ft (43.3 m)
Longest span68 ft (20.7 m)
Deck width59 ft (18 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,600 (2023)
Projected traffic15,827 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 34 over Little Rock Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is US 34 over Little Rock Creek 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 February 2022.

How much traffic does US 34 over Little Rock Creek carry?

About 11,600 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 34 over Little Rock Creek?

The structure is 142 ft (43.3 m) long with a longest span of 68 ft (20.7 m) and a deck 59 ft wide.

Who owns US 34 over Little Rock Creek?

It is owned by the State Highway Agency.