US Bridges

Ch 18 over Webster Ck Overflow

Good

Washington County, Illinois · North of Noltings · Structure no. 095322800000000

Built
1994
31 years old
Condition
Good
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
61 ft
1 main span
Daily traffic
400
2024 count
Owner
County
County Highway Agency

About this bridge

Ch 18 over Webster Ck Overflow is a prestressed concrete box beam or girders - multiple carrying Ch 18 over Webster Ck Overflow in Washington County, Illinois. It was built in 1994, so it is 31 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 400 vehicles a day, roughly 11% of them trucks, projected to reach 635 by 2046. The structure is 61 ft (18.7 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesCh 18
CrossesWebster Ck Overflow
LocationNorth of Noltings
RouteCounty Highway 0
Coordinates38.49344, -89.19987
Functional classRural Minor Collector

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 protection7 GoodSome minor problems.
Last inspectionJune 2024
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 rating48.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length61 ft (18.7 m)
Longest span59 ft (18 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2024)
Projected traffic635 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed11.8 mi (19 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 over Webster Ck Overflow built?

It was built in 1994, making it 31 years old in 2025.

What condition is Ch 18 over Webster Ck Overflow 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 June 2024.

How much traffic does Ch 18 over Webster Ck Overflow carry?

About 400 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Ch 18 over Webster Ck Overflow?

The structure is 61 ft (18.7 m) long with a longest span of 59 ft (18 m) and a deck 28 ft wide.

Who owns Ch 18 over Webster Ck Overflow?

It is owned by the County Highway Agency.