US Bridges

FAS 1911-OLD US 51 over Cnic RR

Fair

Union County, Illinois · Cobden · Structure no. 091007000000000

Built
1997
28 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
150 ft
1 main span
Daily traffic
3,050
2020 count
Owner
State
State Highway Agency

About this bridge

FAS 1911-OLD US 51 over Cnic RR is a steel stringer/multi-beam or girder carrying FAS 1911-OLD US 51 over Cnic RR in Union 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 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 3,050 vehicles a day, roughly 3% of them trucks, projected to reach 3,081 by 2046. The structure is 150 ft (45.6 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFAS 1911-OLD US 51
CrossesCnic RR
LocationCobden
RouteCounty Highway 0
CountyUnion County
StateIllinois
Coordinates37.53458, -89.25451
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79.3 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length150 ft (45.6 m)
Longest span82 ft (25.1 m)
Deck width45 ft (13.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,050 (2020)
Projected traffic3,081 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was FAS 1911-OLD US 51 over Cnic RR built?

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

What condition is FAS 1911-OLD US 51 over Cnic RR 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 February 2025.

How much traffic does FAS 1911-OLD US 51 over Cnic RR carry?

About 3,050 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is FAS 1911-OLD US 51 over Cnic RR?

The structure is 150 ft (45.6 m) long with a longest span of 82 ft (25.1 m) and a deck 45 ft wide.

Who owns FAS 1911-OLD US 51 over Cnic RR?

It is owned by the State Highway Agency.