US Bridges

Il 177/160 over Kaskaskia Overflow

Good

Clinton County, Illinois · 1.2M E of New Memphi · Structure no. 014007400000000

Built
1997
28 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
286 ft
3 main spans
Daily traffic
1,750
2023 count
Owner
State
State Highway Agency

About this bridge

Il 177/160 over Kaskaskia Overflow is a prestressed concrete stringer/multi-beam or girder carrying Il 177/160 over Kaskaskia Overflow in Clinton County, Illinois. It was built in 1997, so it is 28 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 1,750 vehicles a day, roughly 10% of them trucks, projected to reach 2,090 by 2046. The structure is 286 ft (87.1 m) long and 35 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

Location

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CarriesIl 177/160
CrossesKaskaskia Overflow
Location1.2M E of New Memphi
RouteState Highway 160
CountyClinton County
StateIllinois
Coordinates38.45785, -89.65122
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
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 rating83.9 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length286 ft (87.1 m)
Longest span95 ft (29.1 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,750 (2023)
Projected traffic2,090 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 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 Il 177/160 over Kaskaskia Overflow built?

It was built in 1997, making it 28 years old in 2025.

What condition is Il 177/160 over Kaskaskia Overflow 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 2024.

How much traffic does Il 177/160 over Kaskaskia Overflow carry?

About 1,750 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 177/160 over Kaskaskia Overflow?

The structure is 286 ft (87.1 m) long with a longest span of 95 ft (29.1 m) and a deck 35 ft wide.

Who owns Il 177/160 over Kaskaskia Overflow?

It is owned by the State Highway Agency.