US Bridges

Il 173 over Piscasaw Creek

Good

McHenry County, Illinois · 2 M E of Cnty Line · Structure no. 056009000000000

Built
2007
18 years old
Condition
Good
inspected July 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
207 ft
3 main spans
Daily traffic
4,550
2023 count
Owner
State
State Highway Agency

About this bridge

Il 173 over Piscasaw Creek is a steel continuous stringer/multi-beam or girder carrying Il 173 over Piscasaw Creek in McHenry County, Illinois. It was built in 2007, so it is 18 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,550 vehicles a day, roughly 11% of them trucks, projected to reach 6,060 by 2046. The structure is 207 ft (63.1 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesIl 173
CrossesPiscasaw Creek
Location2 M E of Cnty Line
RouteState Highway 173
CountyMcHenry County
StateIllinois
Coordinates42.41578, -88.67176
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating94.2 US tons
Inventory rating56.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length207 ft (63.1 m)
Longest span70 ft (21.3 m)
Deck width43 ft (13.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,550 (2023)
Projected traffic6,060 by 2046
Trucks11%
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 Piscasaw Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is Il 173 over Piscasaw 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 July 2022.

How much traffic does Il 173 over Piscasaw Creek carry?

About 4,550 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Il 173 over Piscasaw Creek?

The structure is 207 ft (63.1 m) long with a longest span of 70 ft (21.3 m) and a deck 43 ft wide.

Who owns Il 173 over Piscasaw Creek?

It is owned by the State Highway Agency.