US Bridges

Il 176 over Fox River

Fair

McHenry County, Illinois · 1.8 M W of Cnty Line · Structure no. 056003800000000

Built
1954
71 years old, rebuilt 1995
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
414 ft
5 main spans
Daily traffic
18,100
2023 count
Owner
State
State Highway Agency

About this bridge

Il 176 over Fox River is a steel continuous stringer/multi-beam or girder carrying Il 176 over Fox River in McHenry County, Illinois. It was built in 1954 and reconstructed in 1995, so it is 71 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 18,100 vehicles a day, roughly 7% of them trucks, projected to reach 21,120 by 2046. The structure is 414 ft (126.2 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesIl 176
CrossesFox River
Location1.8 M W of Cnty Line
RouteState Highway 176
CountyMcHenry County
StateIllinois
Coordinates42.27937, -88.22742
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment6: Equal to present minimum criteria
Operating rating68.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length414 ft (126.2 m)
Longest span114 ft (34.7 m)
Deck width43 ft (13.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,100 (2023)
Projected traffic21,120 by 2046
Trucks7%
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 176 over Fox River built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1995.

What condition is Il 176 over Fox River 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 August 2023.

How much traffic does Il 176 over Fox River carry?

About 18,100 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Il 176 over Fox River?

The structure is 414 ft (126.2 m) long with a longest span of 114 ft (34.7 m) and a deck 43 ft wide.

Who owns Il 176 over Fox River?

It is owned by the State Highway Agency.