US Bridges

Ill 146 over Hills Branch

FairPosted for load

Pope County, Illinois · 0.3 MI E of Ill 145 · Structure no. 076000700000000

Built
1928
97 years old, rebuilt 1975
Condition
Fair
inspected November 2024
Type
Other
Concrete
Length
348 ft
3 main spans
Daily traffic
1,450
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 146 over Hills Branch is a concrete other carrying Ill 146 over Hills Branch in Pope County, Illinois. It was built in 1928 and reconstructed in 1975, so it is 97 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. Its operating status is: posted for load restriction.

It carries about 1,450 vehicles a day, roughly 12% of them trucks, projected to reach 1,768 by 2046. The structure is 348 ft (106 m) long and 34 ft wide. If it were closed, the detour would be 49.1 mi (79 km).

Location

Open in Google Maps
CarriesIll 146
CrossesHills Branch
Location0.3 MI E of Ill 145
RouteState Highway 146
CountyPope County
StateIllinois
Coordinates37.38311, -88.6715
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating8.9 US tons

Structure

Structure typeOther
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length348 ft (106 m)
Longest span188 ft (57.3 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,450 (2023)
Projected traffic1,768 by 2046
Trucks12%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ill 146 over Hills Branch built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1975.

What condition is Ill 146 over Hills Branch 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 November 2024.

How much traffic does Ill 146 over Hills Branch carry?

About 1,450 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Ill 146 over Hills Branch?

The structure is 348 ft (106 m) long with a longest span of 188 ft (57.3 m) and a deck 34 ft wide.

Who owns Ill 146 over Hills Branch?

It is owned by the State Highway Agency.