US Bridges

Il 47 FAP 326 over Johnny Run

Fair

Grundy County, Illinois · S Edge of Mazon · Structure no. 032011200000000

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

About this bridge

Il 47 FAP 326 over Johnny Run is a steel continuous stringer/multi-beam or girder carrying Il 47 FAP 326 over Johnny Run 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 210 ft (64 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIl 47 FAP 326
CrossesJohnny Run
LocationS Edge of Mazon
RouteState Highway 47
CountyGrundy County
StateIllinois
Coordinates41.23744, -88.4188
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 protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 rating92.8 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length210 ft (64 m)
Longest span71 ft (21.7 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 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 Johnny Run built?

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

What condition is Il 47 FAP 326 over Johnny Run 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 March 2023.

How much traffic does Il 47 FAP 326 over Johnny Run carry?

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

How long is Il 47 FAP 326 over Johnny Run?

The structure is 210 ft (64 m) long with a longest span of 71 ft (21.7 m) and a deck 39 ft wide.

Who owns Il 47 FAP 326 over Johnny Run?

It is owned by the State Highway Agency.