US Bridges

Ch 20 over Main Union Sp. Ditch

Good

Henry County, Illinois · 41/2 Mi. S.W. Hooppo · Structure no. 037336200000000

Built
2008
17 years old
Condition
Good
inspected October 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
300
2020 count
Owner
County
County Highway Agency

About this bridge

Ch 20 over Main Union Sp. Ditch is a prestressed concrete box beam or girders - multiple carrying Ch 20 over Main Union Sp. Ditch in Henry County, Illinois. It was built in 2008, so it is 17 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 300 vehicles a day, roughly 9% of them trucks, projected to reach 324 by 2046. The structure is 78 ft (23.7 m) long and 30 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesCh 20
CrossesMain Union Sp. Ditch
Location41/2 Mi. S.W. Hooppo
RouteCounty Highway 0
CountyHenry County
StateIllinois
Coordinates41.50206, -89.97845
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2022
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 rating56.8 US tons
Inventory rating38.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length78 ft (23.7 m)
Longest span75 ft (22.8 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2020)
Projected traffic324 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 20 over Main Union Sp. Ditch built?

It was built in 2008, making it 17 years old in 2025.

What condition is Ch 20 over Main Union Sp. Ditch 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 October 2022.

How much traffic does Ch 20 over Main Union Sp. Ditch carry?

About 300 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is Ch 20 over Main Union Sp. Ditch?

The structure is 78 ft (23.7 m) long with a longest span of 75 ft (22.8 m) and a deck 30 ft wide.

Who owns Ch 20 over Main Union Sp. Ditch?

It is owned by the County Highway Agency.