US Bridges

CH-8 (FAS-473) over Mackinaw River

Fair

McLean County, Illinois · 1.0 MI W Clarksville · Structure no. 057510300000000

Built
1946
79 years old, rebuilt 1996
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
323 ft
5 main spans
Daily traffic
950
2024 count
Owner
County
County Highway Agency

About this bridge

CH-8 (FAS-473) over Mackinaw River is a steel continuous stringer/multi-beam or girder carrying CH-8 (FAS-473) over Mackinaw River in McLean County, Illinois. It was built in 1946 and reconstructed in 1996, so it is 79 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 24% of them trucks, projected to reach 581 by 2046. The structure is 323 ft (98.5 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCH-8 (FAS-473)
CrossesMackinaw River
Location1.0 MI W Clarksville
RouteCounty Highway 0
CountyMcLean County
StateIllinois
Coordinates40.64833, -88.86251
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.
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 inspectionNovember 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length323 ft (98.5 m)
Longest span81 ft (24.7 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic950 (2024)
Projected traffic581 by 2046
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 CH-8 (FAS-473) over Mackinaw River built?

It was built in 1946, making it 79 years old in 2025. It was reconstructed in 1996.

What condition is CH-8 (FAS-473) over Mackinaw River 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 CH-8 (FAS-473) over Mackinaw River carry?

About 950 vehicles per day (2024 count), of which roughly 24% are trucks.

How long is CH-8 (FAS-473) over Mackinaw River?

The structure is 323 ft (98.5 m) long with a longest span of 81 ft (24.7 m) and a deck 30 ft wide.

Who owns CH-8 (FAS-473) over Mackinaw River?

It is owned by the County Highway Agency.