US Bridges

Ch 46 (or 76A) over Unnamed Tributary

Good

Iroquois County, Illinois · 4.5 MI W 4.25 MI S · Structure no. 038511400000000

Built
2008
17 years old
Condition
Good
inspected September 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

Ch 46 (or 76A) over Unnamed Tributary is a prestressed concrete box beam or girders - multiple carrying Ch 46 (or 76A) over Unnamed Tributary in Iroquois 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 100 vehicles a day, roughly 18% of them trucks, projected to reach 101 by 2046. The structure is 73 ft (22.1 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCh 46 (or 76A)
CrossesUnnamed Tributary
Location4.5 MI W 4.25 MI S
RouteCounty Highway 0
CountyIroquois County
StateIllinois
Coordinates40.50245, -87.97311
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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length73 ft (22.1 m)
Longest span70 ft (21.3 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic101 by 2046
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 46 (or 76A) over Unnamed Tributary built?

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

What condition is Ch 46 (or 76A) over Unnamed Tributary 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 2022.

How much traffic does Ch 46 (or 76A) over Unnamed Tributary carry?

About 100 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is Ch 46 (or 76A) over Unnamed Tributary?

The structure is 73 ft (22.1 m) long with a longest span of 70 ft (21.3 m) and a deck 30 ft wide.

Who owns Ch 46 (or 76A) over Unnamed Tributary?

It is owned by the County Highway Agency.