US Bridges

Ill 34 & Ill 146 over Threemile Creek

Fair

Hardin County, Illinois · 1.5 MI E of Ill 146 · Structure no. 035001500000000

Built
2009
16 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
68 ft
1 main span
Daily traffic
1,550
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 34 & Ill 146 over Threemile Creek is a steel stringer/multi-beam or girder carrying Ill 34 & Ill 146 over Threemile Creek in Hardin County, Illinois. It was built in 2009, so it is 16 years old, younger 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 6 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 1,550 vehicles a day, roughly 8% of them trucks, projected to reach 1,717 by 2046. The structure is 68 ft (20.7 m) long and 35 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

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CarriesIll 34 & Ill 146
CrossesThreemile Creek
Location1.5 MI E of Ill 146
RouteState Highway 34
CountyHardin County
StateIllinois
Coordinates37.45983, -88.37704
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.4 US tons
Inventory rating54.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length68 ft (20.7 m)
Longest span66 ft (20 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,550 (2023)
Projected traffic1,717 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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 34 & Ill 146 over Threemile Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is Ill 34 & Ill 146 over Threemile 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 September 2023.

How much traffic does Ill 34 & Ill 146 over Threemile Creek carry?

About 1,550 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Ill 34 & Ill 146 over Threemile Creek?

The structure is 68 ft (20.7 m) long with a longest span of 66 ft (20 m) and a deck 35 ft wide.

Who owns Ill 34 & Ill 146 over Threemile Creek?

It is owned by the State Highway Agency.