US Bridges

Il 173 over Boat Channel

Good

Lake County, Illinois · 1.75 M W of Il 59 · Structure no. 049019800000000

Built
2011
14 years old
Condition
Good
inspected September 2021
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
143 ft
2 main spans
Daily traffic
11,200
2023 count
Owner
State
State Highway Agency

About this bridge

Il 173 over Boat Channel is a steel continuous stringer/multi-beam or girder carrying Il 173 over Boat Channel in Lake County, Illinois. It was built in 2011, so it is 14 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 11,200 vehicles a day, roughly 10% of them trucks, projected to reach 12,726 by 2046. The structure is 143 ft (43.5 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesIl 173
CrossesBoat Channel
Location1.75 M W of Il 59
RouteState Highway 173
CountyLake County
StateIllinois
Coordinates42.47887, -88.13679
Functional classUrban Other Principal 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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2021
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 rating78.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length143 ft (43.5 m)
Longest span72 ft (21.8 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,200 (2023)
Projected traffic12,726 by 2046
Trucks10%
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 173 over Boat Channel built?

It was built in 2011, making it 14 years old in 2025.

What condition is Il 173 over Boat Channel 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 2021.

How much traffic does Il 173 over Boat Channel carry?

About 11,200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 173 over Boat Channel?

The structure is 143 ft (43.5 m) long with a longest span of 72 ft (21.8 m) and a deck 47 ft wide.

Who owns Il 173 over Boat Channel?

It is owned by the State Highway Agency.