US Bridges

US 20 over Cn Railroad

Fair

Stephenson County, Illinois · 2 Mi. E. of Elroy · Structure no. 089007700000000

Built
2010
15 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
339 ft
3 main spans
Daily traffic
8,050
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 over Cn Railroad is a steel continuous stringer/multi-beam or girder carrying US 20 over Cn Railroad in Stephenson County, Illinois. It was built in 2010, so it is 15 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 8,050 vehicles a day, roughly 14% of them trucks, projected to reach 8,383 by 2046. The structure is 339 ft (103.2 m) long and 60 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

Open in Google Maps
CarriesUS 20
CrossesCn Railroad
Location2 Mi. E. of Elroy
RouteU.S. Route 20
CountyStephenson County
StateIllinois
Coordinates42.32828, -89.7293
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating76.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length339 ft (103.2 m)
Longest span147 ft (44.8 m)
Deck width60 ft (18.3 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,050 (2023)
Projected traffic8,383 by 2046
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed34.8 mi (56 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 US 20 over Cn Railroad built?

It was built in 2010, making it 15 years old in 2025.

What condition is US 20 over Cn Railroad 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 November 2024.

How much traffic does US 20 over Cn Railroad carry?

About 8,050 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is US 20 over Cn Railroad?

The structure is 339 ft (103.2 m) long with a longest span of 147 ft (44.8 m) and a deck 60 ft wide.

Who owns US 20 over Cn Railroad?

It is owned by the State Highway Agency.