US Bridges

Ill 3 over Rock Creek

Fair

Randolph County, Illinois · In Rockwood · Structure no. 079001200000000

Built
1932
93 years old, rebuilt 1951
Condition
Fair
inspected January 2024
Type
Tee Beam
Concrete
Length
43 ft
1 main span
Daily traffic
3,450
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 3 over Rock Creek is a concrete tee beam carrying Ill 3 over Rock Creek in Randolph County, Illinois. It was built in 1932 and reconstructed in 1951, so it is 93 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 3,450 vehicles a day, roughly 40% of them trucks, projected to reach 3,283 by 2046. The structure is 43 ft (13.1 m) long and 40 ft wide. If it were closed, the detour would be 36 mi (58 km).

Location

Open in Google Maps
CarriesIll 3
CrossesRock Creek
LocationIn Rockwood
RouteState Highway 3
CountyRandolph County
StateIllinois
Coordinates37.84098, -89.70179
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
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 rating52.5 US tons
Inventory rating31.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length43 ft (13.1 m)
Longest span41 ft (12.5 m)
Deck width40 ft (12.3 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,450 (2023)
Projected traffic3,283 by 2046
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36 mi (58 km)
TollOn a free road
National Highway SystemYes

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 3 over Rock Creek built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1951.

What condition is Ill 3 over Rock 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 January 2024.

How much traffic does Ill 3 over Rock Creek carry?

About 3,450 vehicles per day (2023 count), of which roughly 40% are trucks.

How long is Ill 3 over Rock Creek?

The structure is 43 ft (13.1 m) long with a longest span of 41 ft (12.5 m) and a deck 40 ft wide.

Who owns Ill 3 over Rock Creek?

It is owned by the State Highway Agency.