US Bridges

CO HWY 11 over Swanwick Creek

Fair

Perry County, Illinois · 3 MI NE of Winkle · Structure no. 073311200000000

Built
1980
45 years old
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
101 ft
3 main spans
Daily traffic
100
2024 count
Owner
County
County Highway Agency

About this bridge

CO HWY 11 over Swanwick Creek is a prestressed concrete box beam or girders - multiple carrying CO HWY 11 over Swanwick Creek in Perry County, Illinois. It was built in 1980, so it is 45 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 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 100 vehicles a day, roughly 2% of them trucks, projected to reach 177 by 2046. The structure is 101 ft (30.8 m) long and 25 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesCO HWY 11
CrossesSwanwick Creek
Location3 MI NE of Winkle
RouteCounty Highway 0
CountyPerry County
StateIllinois
Coordinates38.17983, -89.44299
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
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66 US tons
Inventory rating39.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length101 ft (30.8 m)
Longest span39 ft (11.9 m)
Deck width25 ft (7.5 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2024)
Projected traffic177 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 CO HWY 11 over Swanwick Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is CO HWY 11 over Swanwick 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 2024.

How much traffic does CO HWY 11 over Swanwick Creek carry?

About 100 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is CO HWY 11 over Swanwick Creek?

The structure is 101 ft (30.8 m) long with a longest span of 39 ft (11.9 m) and a deck 25 ft wide.

Who owns CO HWY 11 over Swanwick Creek?

It is owned by the County Highway Agency.