US Bridges

US 34 over Rob Roy Creek

Good

Kendall County, Illinois · 2.05 M W of Il 47 · Structure no. 047205100000000

Built
2019
6 years old
Condition
Good
inspected February 2022
Type
Culvert
Concrete
Length
28 ft
2 main spans
Daily traffic
18,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 34 over Rob Roy Creek is a concrete culvert carrying US 34 over Rob Roy Creek in Kendall County, Illinois. It was built in 2019, so it is 6 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 18,700 vehicles a day, roughly 5% of them trucks, projected to reach 23,807 by 2046. The structure is 28 ft (8.6 m) long and 127 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 34
CrossesRob Roy Creek
Location2.05 M W of Il 47
RouteU.S. Route 34
CountyKendall County
StateIllinois
Coordinates41.66143, -88.48162
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 rating59.6 US tons
Inventory rating46.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length28 ft (8.6 m)
Longest span13 ft (4 m)
Deck width127 ft (38.7 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,700 (2023)
Projected traffic23,807 by 2046
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Rob Roy Creek built?

It was built in 2019, making it 6 years old in 2025.

What condition is US 34 over Rob Roy 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 Rob Roy Creek carry?

About 18,700 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 34 over Rob Roy Creek?

The structure is 28 ft (8.6 m) long with a longest span of 13 ft (4 m) and a deck 127 ft wide.

Who owns US 34 over Rob Roy Creek?

It is owned by the State Highway Agency.