US Bridges

Il 171 over Fiddyment Creek

Fair

Will County, Illinois · 3.8 M S of Cook CO · Structure no. 099029200000000

Built
1989
36 years old
Condition
Fair
inspected June 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
86 ft
1 main span
Daily traffic
18,000
2023 count
Owner
State
State Highway Agency

About this bridge

Il 171 over Fiddyment Creek is a prestressed concrete stringer/multi-beam or girder carrying Il 171 over Fiddyment Creek in Will County, Illinois. It was built in 1989, so it is 36 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 18,000 vehicles a day, roughly 5% of them trucks, projected to reach 24,768 by 2046. The structure is 86 ft (26.3 m) long and 82 ft wide.

Location

Open in Google Maps
CarriesIl 171
CrossesFiddyment Creek
Location3.8 M S of Cook CO
RouteState Highway 171
CountyWill County
StateIllinois
Coordinates41.60084, -88.05198
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating95.3 US tons
Inventory rating58.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length86 ft (26.3 m)
Longest span80 ft (24.4 m)
Deck width82 ft (25 m)
Roadway width56 ft (17.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,000 (2023)
Projected traffic24,768 by 2046
Trucks5%
Lanes on structure4
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 171 over Fiddyment Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is Il 171 over Fiddyment 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 2022.

How much traffic does Il 171 over Fiddyment Creek carry?

About 18,000 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Il 171 over Fiddyment Creek?

The structure is 86 ft (26.3 m) long with a longest span of 80 ft (24.4 m) and a deck 82 ft wide.

Who owns Il 171 over Fiddyment Creek?

It is owned by the State Highway Agency.