US Bridges

Ill 146 over Root Lick Branch

Fair

Pope County, Illinois · 2.4 MI E of Ill 145 · Structure no. 076000800000000

Built
1929
96 years old, rebuilt 2009
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
1,250
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 146 over Root Lick Branch is a prestressed concrete box beam or girders - multiple carrying Ill 146 over Root Lick Branch in Pope County, Illinois. It was built in 1929 and reconstructed in 2009, so it is 96 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 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 1,250 vehicles a day, roughly 14% of them trucks, projected to reach 1,566 by 2046. The structure is 45 ft (13.6 m) long and 33 ft wide. If it were closed, the detour would be 49.1 mi (79 km).

CarriesIll 146
CrossesRoot Lick Branch
Location2.4 MI E of Ill 145
RouteState Highway 146
Coordinates37.38003, -88.63581
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating77.8 US tons
Inventory rating46.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length45 ft (13.6 m)
Longest span42 ft (12.8 m)
Deck width33 ft (10.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,250 (2023)
Projected traffic1,566 by 2046
Trucks14%
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 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 146 over Root Lick Branch built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 2009.

What condition is Ill 146 over Root Lick 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 March 2023.

How much traffic does Ill 146 over Root Lick Branch carry?

About 1,250 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Ill 146 over Root Lick Branch?

The structure is 45 ft (13.6 m) long with a longest span of 42 ft (12.8 m) and a deck 33 ft wide.

Who owns Ill 146 over Root Lick Branch?

It is owned by the State Highway Agency.