US Bridges

FAS 470 - Ch 6 over Mackinaw River

Fair

Tazewell County, Illinois · SW-8-T24NR2W · Structure no. 090301600000000

Built
1957
68 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
367 ft
4 main spans
Daily traffic
3,750
2023 count
Owner
County
County Highway Agency

About this bridge

FAS 470 - Ch 6 over Mackinaw River is a steel continuous stringer/multi-beam or girder carrying FAS 470 - Ch 6 over Mackinaw River in Tazewell County, Illinois. It was built in 1957, so it is 68 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 3,750 vehicles a day, roughly 4% of them trucks, projected to reach 3,939 by 2046. The structure is 367 ft (112 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesFAS 470 - Ch 6
CrossesMackinaw River
LocationSW-8-T24NR2W
RouteCounty Highway 0
CountyTazewell County
StateIllinois
Coordinates40.54674, -89.35894
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length367 ft (112 m)
Longest span102 ft (31.1 m)
Deck width31 ft (9.6 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,750 (2023)
Projected traffic3,939 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 FAS 470 - Ch 6 over Mackinaw River built?

It was built in 1957, making it 68 years old in 2025.

What condition is FAS 470 - Ch 6 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 January 2025.

How much traffic does FAS 470 - Ch 6 over Mackinaw River carry?

About 3,750 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is FAS 470 - Ch 6 over Mackinaw River?

The structure is 367 ft (112 m) long with a longest span of 102 ft (31.1 m) and a deck 31 ft wide.

Who owns FAS 470 - Ch 6 over Mackinaw River?

It is owned by the County Highway Agency.