US Bridges

Ill 1 over Harris Creek

Fair

Hardin County, Illinois · 2 MI S Gallatin CO · Structure no. 035000100000000

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

About this bridge

Ill 1 over Harris Creek is a prestressed concrete stringer/multi-beam or girder carrying Ill 1 over Harris Creek 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 81 ft (24.6 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
CrossesHarris Creek
Location2 MI S Gallatin CO
RouteState Highway 1
CountyHardin County
StateIllinois
Coordinates37.5764, -88.18651
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating81.5 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length81 ft (24.6 m)
Longest span38 ft (11.6 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 Harris Creek built?

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

What condition is Ill 1 over Harris Creek 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 Harris Creek carry?

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

How long is Ill 1 over Harris Creek?

The structure is 81 ft (24.6 m) long with a longest span of 38 ft (11.6 m) and a deck 33 ft wide.

Who owns Ill 1 over Harris Creek?

It is owned by the State Highway Agency.