US Bridges

Rock City RD over Pecatonica River

Good

Stephenson County, Illinois · 7.0 MI E Freeport · Structure no. 089300500000000

Built
1950
75 years old, rebuilt 1993
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
294 ft
3 main spans
Daily traffic
1,150
2024 count
Owner
County
County Highway Agency

About this bridge

Rock City RD over Pecatonica River is a steel continuous stringer/multi-beam or girder carrying Rock City RD over Pecatonica River in Stephenson County, Illinois. It was built in 1950 and reconstructed in 1993, so it is 75 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 1,150 vehicles a day, roughly 23% of them trucks, projected to reach 1,111 by 2046. The structure is 294 ft (89.6 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesRock City RD
CrossesPecatonica River
Location7.0 MI E Freeport
RouteCounty Highway 0
Coordinates42.31124, -89.4755
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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
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 rating69.3 US tons
Inventory rating41.4 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length294 ft (89.6 m)
Longest span113 ft (34.4 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,150 (2024)
Projected traffic1,111 by 2046
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Rock City RD over Pecatonica River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1993.

What condition is Rock City RD over Pecatonica River 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 Rock City RD over Pecatonica River carry?

About 1,150 vehicles per day (2024 count), of which roughly 23% are trucks.

How long is Rock City RD over Pecatonica River?

The structure is 294 ft (89.6 m) long with a longest span of 113 ft (34.4 m) and a deck 30 ft wide.

Who owns Rock City RD over Pecatonica River?

It is owned by the County Highway Agency.