US Bridges

Il 100 over Illinois R Trib.

Fair

Schuyler County, Illinois · 3.7M N Browning Ctr · Structure no. 085000800000000

Built
1935
90 years old
Condition
Fair
inspected December 2023
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
600
2023 count
Owner
State
State Highway Agency

About this bridge

Il 100 over Illinois R Trib. is a concrete slab carrying Il 100 over Illinois R Trib. in Schuyler County, Illinois. It was built in 1935, so it is 90 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 600 vehicles a day, roughly 23% of them trucks, projected to reach 581 by 2046. The structure is 25 ft (7.7 m) long and 43 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesIl 100
CrossesIllinois R Trib.
Location3.7M N Browning Ctr
RouteState Highway 100
CountySchuyler County
StateIllinois
Coordinates40.15472, -90.3119
Functional classRural Minor 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
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 protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating63.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length25 ft (7.7 m)
Longest span25 ft (7.6 m)
Deck width43 ft (13.1 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2023)
Projected traffic581 by 2046
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$113,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 100 over Illinois R Trib. built?

It was built in 1935, making it 90 years old in 2025.

What condition is Il 100 over Illinois R Trib. 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 December 2023.

How much traffic does Il 100 over Illinois R Trib. carry?

About 600 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is Il 100 over Illinois R Trib.?

The structure is 25 ft (7.7 m) long with a longest span of 25 ft (7.6 m) and a deck 43 ft wide.

Who owns Il 100 over Illinois R Trib.?

It is owned by the State Highway Agency.