US Bridges

US 51 (fap 322) over N Fork Kaskaskia Riv

Good

Marion County, Illinois · 1.5 MI S Vernon · Structure no. 061009400000000

Built
2010
15 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
225 ft
3 main spans
Daily traffic
2,750
2023 count
Owner
State
State Highway Agency

About this bridge

US 51 (fap 322) over N Fork Kaskaskia Riv is a steel stringer/multi-beam or girder carrying US 51 (fap 322) over N Fork Kaskaskia Riv in Marion County, Illinois. It was built in 2010, so it is 15 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,750 vehicles a day, roughly 21% of them trucks, projected to reach 2,980 by 2046. The structure is 225 ft (68.7 m) long and 43 ft wide. If it were closed, the detour would be 51 mi (82 km).

Location

Open in Google Maps
CarriesUS 51 (fap 322)
CrossesN Fork Kaskaskia Riv
Location1.5 MI S Vernon
RouteU.S. Route 51
CountyMarion County
StateIllinois
Coordinates38.77394, -89.08655
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
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 rating98.2 US tons
Inventory rating71.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length225 ft (68.7 m)
Longest span88 ft (26.7 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,750 (2023)
Projected traffic2,980 by 2046
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed51 mi (82 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 US 51 (fap 322) over N Fork Kaskaskia Riv built?

It was built in 2010, making it 15 years old in 2025.

What condition is US 51 (fap 322) over N Fork Kaskaskia Riv 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 January 2025.

How much traffic does US 51 (fap 322) over N Fork Kaskaskia Riv carry?

About 2,750 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is US 51 (fap 322) over N Fork Kaskaskia Riv?

The structure is 225 ft (68.7 m) long with a longest span of 88 ft (26.7 m) and a deck 43 ft wide.

Who owns US 51 (fap 322) over N Fork Kaskaskia Riv?

It is owned by the State Highway Agency.