US Bridges

Ill 1 over Br of Rock CR

Fair

Hardin County, Illinois · 3.6 MI S Gallatin CO · Structure no. 035000300000000

Built
1935
90 years old, rebuilt 2009
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
1,100
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 1 over Br of Rock CR is a prestressed concrete stringer/multi-beam or girder carrying Ill 1 over Br of Rock CR in Hardin County, Illinois. It was built in 1935 and reconstructed in 2009, so it is 90 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,100 vehicles a day, roughly 54% of them trucks, projected to reach 1,162 by 2046. The structure is 51 ft (15.5 m) long and 33 ft wide. If it were closed, the detour would be 54.1 mi (87 km).

Location

Open in Google Maps
CarriesIll 1
CrossesBr of Rock CR
Location3.6 MI S Gallatin CO
RouteState Highway 1
CountyHardin County
StateIllinois
Coordinates37.55415, -88.17397
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating66.8 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span47 ft (14.3 m)
Deck width33 ft (10.1 m)
Roadway width33 ft (10.1 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 Ill 1 over Br of Rock CR built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2009.

What condition is Ill 1 over Br of Rock CR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does Ill 1 over Br of Rock CR carry?

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

How long is Ill 1 over Br of Rock CR?

The structure is 51 ft (15.5 m) long with a longest span of 47 ft (14.3 m) and a deck 33 ft wide.

Who owns Ill 1 over Br of Rock CR?

It is owned by the State Highway Agency.