US Bridges

Il 176 over Kishwaukee River

Good

McHenry County, Illinois · 0.9 M W of Gee RD · Structure no. 056007800000000

Built
2008
17 years old
Condition
Good
inspected September 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
78 ft
1 main span
Daily traffic
8,600
2023 count
Owner
State
State Highway Agency

About this bridge

Il 176 over Kishwaukee River is a steel stringer/multi-beam or girder carrying Il 176 over Kishwaukee River in McHenry County, Illinois. It was built in 2008, so it is 17 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 8,600 vehicles a day, roughly 8% of them trucks, projected to reach 10,080 by 2046. The structure is 78 ft (23.8 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesIl 176
CrossesKishwaukee River
Location0.9 M W of Gee RD
RouteState Highway 176
CountyMcHenry County
StateIllinois
Coordinates42.25511, -88.50834
Functional classRural Principal Arterial - Other

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 rating98.2 US tons
Inventory rating63.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length78 ft (23.8 m)
Longest span72 ft (22 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,600 (2023)
Projected traffic10,080 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Il 176 over Kishwaukee River built?

It was built in 2008, making it 17 years old in 2025.

What condition is Il 176 over Kishwaukee River 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 September 2022.

How much traffic does Il 176 over Kishwaukee River carry?

About 8,600 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Il 176 over Kishwaukee River?

The structure is 78 ft (23.8 m) long with a longest span of 72 ft (22 m) and a deck 43 ft wide.

Who owns Il 176 over Kishwaukee River?

It is owned by the State Highway Agency.