US Bridges

US 51 (sb)(fap 322 over Coon Creek

Good

De Witt County, Illinois · .5 MI S of Clinton · Structure no. 020005500000000

Built
1986
39 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
243 ft
3 main spans
Daily traffic
6,950
2023 count
Owner
State
State Highway Agency

About this bridge

US 51 (sb)(fap 322 over Coon Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying US 51 (sb)(fap 322 over Coon 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,950 vehicles a day, roughly 18% of them trucks, projected to reach 3,475 by 2046. The structure is 243 ft (74.1 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 (sb)(fap 322
CrossesCoon Creek
Location.5 MI S of Clinton
RouteU.S. Route 51
CountyDe Witt County
StateIllinois
Coordinates40.13297, -88.97122
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating80 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length243 ft (74.1 m)
Longest span79 ft (24.2 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,950 (2023)
Projected traffic3,475 by 2046
Trucks18%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 51 (sb)(fap 322 over Coon Creek built?

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

What condition is US 51 (sb)(fap 322 over Coon Creek 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 September 2024.

How much traffic does US 51 (sb)(fap 322 over Coon Creek carry?

About 6,950 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is US 51 (sb)(fap 322 over Coon Creek?

The structure is 243 ft (74.1 m) long with a longest span of 79 ft (24.2 m) and a deck 43 ft wide.

Who owns US 51 (sb)(fap 322 over Coon Creek?

It is owned by the State Highway Agency.