US Bridges

FAS 492 Ch 7 over Mackinaw River

Fair

McLean County, Illinois · 0.5 MI S Anchor · Structure no. 057312900000000

Built
1985
40 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
104 ft
3 main spans
Daily traffic
725
2024 count
Owner
County
County Highway Agency

About this bridge

FAS 492 Ch 7 over Mackinaw River is a concrete continuous slab carrying FAS 492 Ch 7 over Mackinaw River in McLean County, Illinois. It was built in 1985, so it is 40 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 725 vehicles a day, roughly 54% of them trucks, projected to reach 530 by 2046. The structure is 104 ft (31.7 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFAS 492 Ch 7
CrossesMackinaw River
Location0.5 MI S Anchor
RouteCounty Highway 0
CountyMcLean County
StateIllinois
Coordinates40.55874, -88.53547
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length104 ft (31.7 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic725 (2024)
Projected traffic530 by 2046
Trucks54%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 492 Ch 7 over Mackinaw River built?

It was built in 1985, making it 40 years old in 2025.

What condition is FAS 492 Ch 7 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 February 2024.

How much traffic does FAS 492 Ch 7 over Mackinaw River carry?

About 725 vehicles per day (2024 count), of which roughly 54% are trucks.

How long is FAS 492 Ch 7 over Mackinaw River?

The structure is 104 ft (31.7 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns FAS 492 Ch 7 over Mackinaw River?

It is owned by the County Highway Agency.