US Bridges

FAS 491 Ch 15 over Br Mackinaw River

Good

McLean County, Illinois · 3.0 MI S Colfax · Structure no. 057502900000000

Built
1988
37 years old
Condition
Good
inspected March 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
725
2024 count
Owner
County
County Highway Agency

About this bridge

FAS 491 Ch 15 over Br Mackinaw River is a concrete continuous culvert carrying FAS 491 Ch 15 over Br Mackinaw River in McLean County, Illinois. It was built in 1988, so it is 37 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 725 vehicles a day, roughly 48% of them trucks, projected to reach 783 by 2046. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesFAS 491 Ch 15
CrossesBr Mackinaw River
Location3.0 MI S Colfax
RouteCounty Highway 0
Coordinates40.51229, -88.6322
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.3 US tons
Inventory rating47.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic725 (2024)
Projected traffic783 by 2046
Trucks48%
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 491 Ch 15 over Br Mackinaw River built?

It was built in 1988, making it 37 years old in 2025.

What condition is FAS 491 Ch 15 over Br Mackinaw River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2024.

How much traffic does FAS 491 Ch 15 over Br Mackinaw River carry?

About 725 vehicles per day (2024 count), of which roughly 48% are trucks.

How long is FAS 491 Ch 15 over Br Mackinaw River?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns FAS 491 Ch 15 over Br Mackinaw River?

It is owned by the County Highway Agency.