US Bridges

Rock Sprng Rd/ TR over Harding Ditch

FairClosed to traffic

St. Clair County, Illinois · 1 MI N US 50 · Structure no. 082400000000000

Built
1901
124 years old, rebuilt 2003
Condition
Fair
inspected June 2024
Type
Girder and Floorbeam System
Steel
Length
35 ft
1 main span
Daily traffic
50
2023 count
Owner
Private
Private (other than railroad)

About this bridge

Rock Sprng Rd/ TR over Harding Ditch is a steel girder and floorbeam system carrying Rock Sprng Rd/ TR over Harding Ditch in St. Clair County, Illinois. It was built in 1901 and reconstructed in 2003, so it is 124 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. Its operating status is: closed to all traffic.

It carries about 50 vehicles a day, roughly 22% of them trucks, projected to reach 76 by 2046. The structure is 35 ft (10.8 m) long and 16 ft wide.

Location

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CarriesRock Sprng Rd/ TR
CrossesHarding Ditch
Location1 MI N US 50
RouteCounty Highway 0
CountySt. Clair County
StateIllinois
Coordinates38.61538, -90.07444
Functional classUrban Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating17.9 US tons
Inventory rating10.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length35 ft (10.8 m)
Longest span34 ft (10.5 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic76 by 2046
Trucks22%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerPrivate (other than railroad)
Maintained byPrivate (other than railroad)
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$30,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Rock Sprng Rd/ TR over Harding Ditch built?

It was built in 1901, making it 124 years old in 2025. It was reconstructed in 2003.

What condition is Rock Sprng Rd/ TR over Harding Ditch 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 June 2024.

How much traffic does Rock Sprng Rd/ TR over Harding Ditch carry?

About 50 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is Rock Sprng Rd/ TR over Harding Ditch?

The structure is 35 ft (10.8 m) long with a longest span of 34 ft (10.5 m) and a deck 16 ft wide.

Who owns Rock Sprng Rd/ TR over Harding Ditch?

It is owned by the Private (other than railroad).