US Bridges

Ill 150 over Rock Fork CR

FairPosted for load

Perry County, Illinois · 1.3 Mi.S.Of Ill 154 · Structure no. 073200200000000

Built
1928
97 years old
Condition
Fair
inspected December 2024
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
775
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 150 over Rock Fork CR is a concrete continuous culvert carrying Ill 150 over Rock Fork CR in Perry County, Illinois. It was built in 1928, 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 775 vehicles a day, roughly 17% of them trucks, projected to reach 909 by 2046. The structure is 23 ft (6.9 m) long and 32 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

Open in Google Maps
CarriesIll 150
CrossesRock Fork CR
Location1.3 Mi.S.Of Ill 154
RouteState Highway 150
CountyPerry County
StateIllinois
Coordinates38.06784, -89.55638
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
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating19.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length23 ft (6.9 m)
Longest span10 ft (3 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic775 (2023)
Projected traffic909 by 2046
Trucks17%
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 150 over Rock Fork CR built?

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

What condition is Ill 150 over Rock Fork 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 December 2024.

How much traffic does Ill 150 over Rock Fork CR carry?

About 775 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is Ill 150 over Rock Fork CR?

The structure is 23 ft (6.9 m) long with a longest span of 10 ft (3 m) and a deck 32 ft wide.

Who owns Ill 150 over Rock Fork CR?

It is owned by the State Highway Agency.