US Bridges

Rockton RD over Rock River

Good

Winnebago County, Illinois · .4 MI W. of Rockton · Structure no. 101308000000000

Built
1990
35 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
371 ft
4 main spans
Daily traffic
2,200
2022 count
Owner
County
County Highway Agency

About this bridge

Rockton RD over Rock River is a prestressed concrete continuous stringer/multi-beam or girder carrying Rockton RD over Rock River in Winnebago County, Illinois. It was built in 1990, so it is 35 years old, younger 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 2,200 vehicles a day, roughly 5% of them trucks, projected to reach 2,273 by 2046. The structure is 371 ft (113.2 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesRockton RD
CrossesRock River
Location.4 MI W. of Rockton
CountyWinnebago County
StateIllinois
Coordinates42.46027, -89.09509
Functional classUrban 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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.7 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length371 ft (113.2 m)
Longest span92 ft (28 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2022)
Projected traffic2,273 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Rockton RD over Rock River built?

It was built in 1990, making it 35 years old in 2025.

What condition is Rockton RD over Rock 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 July 2023.

How much traffic does Rockton RD over Rock River carry?

About 2,200 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Rockton RD over Rock River?

The structure is 371 ft (113.2 m) long with a longest span of 92 ft (28 m) and a deck 35 ft wide.

Who owns Rockton RD over Rock River?

It is owned by the County Highway Agency.