US Bridges

Il 111 over Little Piasa Creek

Fair

Macoupin County, Illinois · 3.7 M S JCT Il 16 · Structure no. 059001900000000

Built
1929
96 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
33 ft
1 main span
Daily traffic
4,550
2023 count
Owner
State
State Highway Agency

About this bridge

Il 111 over Little Piasa Creek is a concrete slab carrying Il 111 over Little Piasa Creek in Macoupin County, Illinois. It was built in 1929, so it is 96 years old, older 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 5 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 4,550 vehicles a day, roughly 15% of them trucks, projected to reach 5,151 by 2046. The structure is 33 ft (10 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIl 111
CrossesLittle Piasa Creek
Location3.7 M S JCT Il 16
RouteState Highway 111
CountyMacoupin County
StateIllinois
Coordinates39.06282, -90.14167
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.4 US tons
Inventory rating43.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length33 ft (10 m)
Longest span32 ft (9.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,550 (2023)
Projected traffic5,151 by 2046
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$96,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 111 over Little Piasa Creek built?

It was built in 1929, making it 96 years old in 2025.

What condition is Il 111 over Little Piasa 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 January 2025.

How much traffic does Il 111 over Little Piasa Creek carry?

About 4,550 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Il 111 over Little Piasa Creek?

The structure is 33 ft (10 m) long with a longest span of 32 ft (9.8 m) and a deck 32 ft wide.

Who owns Il 111 over Little Piasa Creek?

It is owned by the State Highway Agency.