US Bridges

Ill 161 over Crooked Creek

Good

Clinton County, Illinois · 8.6 M E Il 127 · Structure no. 014008000000000

Built
2019
6 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,074 ft
8 main spans
Daily traffic
6,100
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 161 over Crooked Creek is a steel continuous stringer/multi-beam or girder carrying Ill 161 over Crooked Creek in Clinton County, Illinois. It was built in 2019, so it is 6 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 6,100 vehicles a day, roughly 9% of them trucks, projected to reach 6,655 by 2046. The structure is 1,074 ft (327.5 m) long and 43 ft wide. If it were closed, the detour would be 42.9 mi (69 km).

Location

Open in Google Maps
CarriesIll 161
CrossesCrooked Creek
Location8.6 M E Il 127
RouteState Highway 161
CountyClinton County
StateIllinois
Coordinates38.53488, -89.19348
Functional classRural Minor 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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating46.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 25 or greater
Structure length1,074 ft (327.5 m)
Longest span192 ft (58.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,100 (2023)
Projected traffic6,655 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.9 mi (69 km)
TollOn a free road
National Highway SystemNo

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 Ill 161 over Crooked Creek built?

It was built in 2019, making it 6 years old in 2025.

What condition is Ill 161 over Crooked 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 April 2023.

How much traffic does Ill 161 over Crooked Creek carry?

About 6,100 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Ill 161 over Crooked Creek?

The structure is 1,074 ft (327.5 m) long with a longest span of 192 ft (58.5 m) and a deck 43 ft wide.

Who owns Ill 161 over Crooked Creek?

It is owned by the State Highway Agency.