US Bridges

Il 1 over Rock Creek

Good

Hardin County, Illinois · 3.3 MI S Gallatin CO · Structure no. 035001700000000

Built
2015
10 years old
Condition
Good
inspected October 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
132 ft
3 main spans
Daily traffic
1,100
2023 count
Owner
State
State Highway Agency

About this bridge

Il 1 over Rock Creek is a steel continuous stringer/multi-beam or girder carrying Il 1 over Rock Creek in Hardin County, Illinois. It was built in 2015, so it is 10 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 1,100 vehicles a day, roughly 54% of them trucks, projected to reach 1,162 by 2046. The structure is 132 ft (40.1 m) long and 35 ft wide. If it were closed, the detour would be 54.1 mi (87 km).

Location

Open in Google Maps
CarriesIl 1
CrossesRock Creek
Location3.3 MI S Gallatin CO
RouteState Highway 1
CountyHardin County
StateIllinois
Coordinates37.55807, -88.17806
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 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.5 US tons
Inventory rating71.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length132 ft (40.1 m)
Longest span47 ft (14.3 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic1,162 by 2046
Trucks54%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed54.1 mi (87 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 1 over Rock Creek built?

It was built in 2015, making it 10 years old in 2025.

What condition is Il 1 over Rock 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 October 2022.

How much traffic does Il 1 over Rock Creek carry?

About 1,100 vehicles per day (2023 count), of which roughly 54% are trucks.

How long is Il 1 over Rock Creek?

The structure is 132 ft (40.1 m) long with a longest span of 47 ft (14.3 m) and a deck 35 ft wide.

Who owns Il 1 over Rock Creek?

It is owned by the State Highway Agency.