US Bridges

S. Rock City Road over Stream

Good

Stephenson County, Illinois · .3 MI S German Valy · Structure no. 089500200000000

Built
1931
94 years old, rebuilt 1975
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
900
2024 count
Owner
County
County Highway Agency

About this bridge

S. Rock City Road over Stream is a concrete culvert carrying S. Rock City Road over Stream in Stephenson County, Illinois. It was built in 1931 and reconstructed in 1975, so it is 94 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 900 vehicles a day, roughly 14% of them trucks, projected to reach 1,010 by 2046. The structure is 26 ft (8 m) long. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesS. Rock City Road
CrossesStream
Location.3 MI S German Valy
RouteCounty Highway 0
CountyStephenson County
StateIllinois
Coordinates42.21205, -89.47394
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating33.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (8 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2024)
Projected traffic1,010 by 2046
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 S. Rock City Road over Stream built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1975.

What condition is S. Rock City Road over Stream in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does S. Rock City Road over Stream carry?

About 900 vehicles per day (2024 count), of which roughly 14% are trucks.

How long is S. Rock City Road over Stream?

The structure is 26 ft (8 m) long with a longest span of 12 ft (3.7 m).

Who owns S. Rock City Road over Stream?

It is owned by the County Highway Agency.