US Bridges

Il 23 over Riley Creek

Fair

McHenry County, Illinois · 1.2 M N I-90 Toll · Structure no. 056007000000000

Built
2002
23 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
35 ft
3 main spans
Daily traffic
5,200
2023 count
Owner
State
State Highway Agency

About this bridge

Il 23 over Riley Creek is a concrete culvert carrying Il 23 over Riley Creek in McHenry County, Illinois. It was built in 2002, so it is 23 years old, younger 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 5,200 vehicles a day, roughly 22% of them trucks, projected to reach 5,760 by 2046. The structure is 35 ft (10.8 m) long and 45 ft wide.

Location

Open in Google Maps
CarriesIl 23
CrossesRiley Creek
Location1.2 M N I-90 Toll
RouteState Highway 23
CountyMcHenry County
StateIllinois
Coordinates42.19531, -88.61814
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length35 ft (10.8 m)
Longest span10 ft (3 m)
Deck width45 ft (13.7 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,200 (2023)
Projected traffic5,760 by 2046
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Il 23 over Riley Creek built?

It was built in 2002, making it 23 years old in 2025.

What condition is Il 23 over Riley 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 2023.

How much traffic does Il 23 over Riley Creek carry?

About 5,200 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is Il 23 over Riley Creek?

The structure is 35 ft (10.8 m) long with a longest span of 10 ft (3 m) and a deck 45 ft wide.

Who owns Il 23 over Riley Creek?

It is owned by the State Highway Agency.