US Bridges

William ST over Copper Slough

Fair

Champaign County, Illinois · .25 MI W Duncan RD · Structure no. 010620400000000

Built
1966
59 years old, rebuilt 2004
Condition
Fair
inspected September 2024
Type
Channel Beam
Concrete
Length
73 ft
3 main spans
Daily traffic
950
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

William ST over Copper Slough is a concrete channel beam carrying William ST over Copper Slough in Champaign County, Illinois. It was built in 1966 and reconstructed in 2004, so it is 59 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.

It carries about 950 vehicles a day, roughly 6% of them trucks, projected to reach 960 by 2046. The structure is 73 ft (22.2 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWilliam ST
CrossesCopper Slough
Location.25 MI W Duncan RD
RouteCity Street 0
CountyChampaign County
StateIllinois
Coordinates40.1061, -88.29688
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating40 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length73 ft (22.2 m)
Longest span23 ft (7.1 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic950 (2021)
Projected traffic960 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 William ST over Copper Slough built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2004.

What condition is William ST over Copper Slough 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 September 2024.

How much traffic does William ST over Copper Slough carry?

About 950 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is William ST over Copper Slough?

The structure is 73 ft (22.2 m) long with a longest span of 23 ft (7.1 m) and a deck 33 ft wide.

Who owns William ST over Copper Slough?

It is owned by the City or Municipal Highway Agency.