US Bridges

US 51 (nb)(fap 322 over Salt Creek

Fair

De Witt County, Illinois · 2 MI S of Clinton · Structure no. 020005700000000

Built
1986
39 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
300 ft
4 main spans
Daily traffic
9,450
2023 count
Owner
State
State Highway Agency

About this bridge

US 51 (nb)(fap 322 over Salt Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying US 51 (nb)(fap 322 over Salt Creek in De Witt County, Illinois. It was built in 1986, so it is 39 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 9,450 vehicles a day, roughly 15% of them trucks, projected to reach 4,725 by 2046. The structure is 300 ft (91.4 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 51 (nb)(fap 322
CrossesSalt Creek
Location2 MI S of Clinton
RouteU.S. Route 51
CountyDe Witt County
StateIllinois
Coordinates40.10686, -88.96546
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.5 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span86 ft (26.2 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,450 (2023)
Projected traffic4,725 by 2046
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US 51 (nb)(fap 322 over Salt Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is US 51 (nb)(fap 322 over Salt Creek 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 September 2024.

How much traffic does US 51 (nb)(fap 322 over Salt Creek carry?

About 9,450 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 51 (nb)(fap 322 over Salt Creek?

The structure is 300 ft (91.4 m) long with a longest span of 86 ft (26.2 m) and a deck 43 ft wide.

Who owns US 51 (nb)(fap 322 over Salt Creek?

It is owned by the State Highway Agency.