US Bridges

Il 111 over Piasa CR Branch

Fair

Macoupin County, Illinois · .8M S Il 16 · Structure no. 059001800000000

Built
1930
95 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
4,200
2023 count
Owner
State
State Highway Agency

About this bridge

Il 111 over Piasa CR Branch is a concrete slab carrying Il 111 over Piasa CR Branch in Macoupin County, Illinois. It was built in 1930, so it is 95 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 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 4,200 vehicles a day, roughly 11% of them trucks, projected to reach 4,545 by 2046. The structure is 32 ft (9.8 m) long and 53 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIl 111
CrossesPiasa CR Branch
Location.8M S Il 16
RouteState Highway 111
CountyMacoupin County
StateIllinois
Coordinates39.10441, -90.14176
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating60.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width53 ft (16.3 m)
Roadway width52 ft (15.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (2023)
Projected traffic4,545 by 2046
Trucks11%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 111 over Piasa CR Branch built?

It was built in 1930, making it 95 years old in 2025.

What condition is Il 111 over Piasa CR Branch 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 October 2023.

How much traffic does Il 111 over Piasa CR Branch carry?

About 4,200 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Il 111 over Piasa CR Branch?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 53 ft wide.

Who owns Il 111 over Piasa CR Branch?

It is owned by the State Highway Agency.