US Bridges

Il 47 FAP 326 over W Fork Mazon River

Fair

Grundy County, Illinois · 6.1 MI N of I-55 · Structure no. 032011600000000

Built
2009
16 years old
Condition
Fair
inspected January 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
140 ft
2 main spans
Daily traffic
4,550
2023 count
Owner
State
State Highway Agency

About this bridge

Il 47 FAP 326 over W Fork Mazon River is a steel continuous stringer/multi-beam or girder carrying Il 47 FAP 326 over W Fork Mazon River in Grundy County, Illinois. It was built in 2009, so it is 16 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 4,550 vehicles a day, roughly 20% of them trucks, projected to reach 5,640 by 2046. The structure is 140 ft (42.7 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIl 47 FAP 326
CrossesW Fork Mazon River
Location6.1 MI N of I-55
RouteState Highway 47
CountyGrundy County
StateIllinois
Coordinates41.20563, -88.41759
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.3 US tons
Inventory rating50.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span70 ft (21.3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,550 (2023)
Projected traffic5,640 by 2046
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Il 47 FAP 326 over W Fork Mazon River built?

It was built in 2009, making it 16 years old in 2025.

What condition is Il 47 FAP 326 over W Fork Mazon 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 2022.

How much traffic does Il 47 FAP 326 over W Fork Mazon River carry?

About 4,550 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is Il 47 FAP 326 over W Fork Mazon River?

The structure is 140 ft (42.7 m) long with a longest span of 70 ft (21.3 m) and a deck 43 ft wide.

Who owns Il 47 FAP 326 over W Fork Mazon River?

It is owned by the State Highway Agency.