US Bridges

Ch 18 (fas 1490) over Salt Creek

Good

De Witt County, Illinois · 1 MI S Weldon Spring · Structure no. 020300800000000

Built
1964
61 years old
Condition
Good
inspected May 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
305 ft
4 main spans
Daily traffic
375
2022 count
Owner
County
County Highway Agency

About this bridge

Ch 18 (fas 1490) over Salt Creek is a steel continuous stringer/multi-beam or girder carrying Ch 18 (fas 1490) over Salt Creek in De Witt County, Illinois. It was built in 1964, so it is 61 years old, older 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 375 vehicles a day, roughly 8% of them trucks, projected to reach 455 by 2046. The structure is 305 ft (93 m) long and 28 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesCh 18 (fas 1490)
CrossesSalt Creek
Location1 MI S Weldon Spring
RouteCounty Highway 0
Coordinates40.11016, -88.92422
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Last inspectionMay 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.3 US tons
Inventory rating26.5 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length305 ft (93 m)
Longest span84 ft (25.6 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic375 (2022)
Projected traffic455 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Ch 18 (fas 1490) over Salt Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is Ch 18 (fas 1490) over Salt 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 May 2022.

How much traffic does Ch 18 (fas 1490) over Salt Creek carry?

About 375 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Ch 18 (fas 1490) over Salt Creek?

The structure is 305 ft (93 m) long with a longest span of 84 ft (25.6 m) and a deck 28 ft wide.

Who owns Ch 18 (fas 1490) over Salt Creek?

It is owned by the County Highway Agency.