US Bridges

Il 146 over Big Grand Pierre CR

Good

Pope County, Illinois · 0.87 MI W Hardin CO · Structure no. 076003100000000

Built
2013
12 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
202 ft
3 main spans
Daily traffic
900
2023 count
Owner
State
State Highway Agency

About this bridge

Il 146 over Big Grand Pierre CR is a steel continuous stringer/multi-beam or girder carrying Il 146 over Big Grand Pierre CR in Pope County, Illinois. It was built in 2013, so it is 12 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 900 vehicles a day, roughly 10% of them trucks, projected to reach 1,111 by 2046. The structure is 202 ft (61.7 m) long and 35 ft wide. If it were closed, the detour would be 49.1 mi (79 km).

CarriesIl 146
CrossesBig Grand Pierre CR
Location0.87 MI W Hardin CO
RouteState Highway 146
Coordinates37.45885, -88.43057
Functional classRural Minor Arterial

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 inspectionDecember 2023
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.9 US tons
Inventory rating63.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length202 ft (61.7 m)
Longest span76 ft (23.2 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2023)
Projected traffic1,111 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.1 mi (79 km)
TollOn a free road
National Highway SystemNo

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 Il 146 over Big Grand Pierre CR built?

It was built in 2013, making it 12 years old in 2025.

What condition is Il 146 over Big Grand Pierre CR 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 December 2023.

How much traffic does Il 146 over Big Grand Pierre CR carry?

About 900 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 146 over Big Grand Pierre CR?

The structure is 202 ft (61.7 m) long with a longest span of 76 ft (23.2 m) and a deck 35 ft wide.

Who owns Il 146 over Big Grand Pierre CR?

It is owned by the State Highway Agency.