US Bridges

FAS 355 Ch 29 over Mackinaw River

Fair

McLean County, Illinois · 2.7 MI Wnw Clarksvil · Structure no. 057510000000000

Built
1956
69 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
383 ft
5 main spans
Daily traffic
2,050
2024 count
Owner
County
County Highway Agency

About this bridge

FAS 355 Ch 29 over Mackinaw River is a steel continuous stringer/multi-beam or girder carrying FAS 355 Ch 29 over Mackinaw River in McLean County, Illinois. It was built in 1956, so it is 69 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 2,050 vehicles a day, roughly 6% of them trucks, projected to reach 1,717 by 2046. The structure is 383 ft (116.7 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesFAS 355 Ch 29
CrossesMackinaw River
Location2.7 MI Wnw Clarksvil
RouteCounty Highway 0
CountyMcLean County
StateIllinois
Coordinates40.66444, -88.89928
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 15
Structure length383 ft (116.7 m)
Longest span90 ft (27.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,050 (2024)
Projected traffic1,717 by 2046
Trucks6%
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 FAS 355 Ch 29 over Mackinaw River built?

It was built in 1956, making it 69 years old in 2025.

What condition is FAS 355 Ch 29 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 355 Ch 29 over Mackinaw River carry?

About 2,050 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is FAS 355 Ch 29 over Mackinaw River?

The structure is 383 ft (116.7 m) long with a longest span of 90 ft (27.4 m) and a deck 26 ft wide.

Who owns FAS 355 Ch 29 over Mackinaw River?

It is owned by the County Highway Agency.