US Bridges

Il 2 N B over Rock River

FairPosted for load

Winnebago County, Illinois · 0.1 M S Hononegah RD · Structure no. 101012600000000

Built
1966
59 years old
Condition
Fair
inspected June 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
610 ft
5 main spans
Daily traffic
8,550
2023 count
Owner
State
State Highway Agency

About this bridge

Il 2 N B over Rock River is a steel continuous girder and floorbeam system carrying Il 2 N B over Rock River in Winnebago County, Illinois. It was built in 1966, so it is 59 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. Its operating status is: posted for load restriction.

It carries about 8,550 vehicles a day, roughly 4% of them trucks, projected to reach 4,015 by 2046. The structure is 610 ft (185.9 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIl 2 N B
CrossesRock River
Location0.1 M S Hononegah RD
RouteState Highway 2
CountyWinnebago County
StateIllinois
Coordinates42.45003, -89.05975
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusPosted for load 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating24.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5 (+2 approach)
Design loadHS 20
Structure length610 ft (185.9 m)
Longest span119 ft (36.4 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,550 (2023)
Projected traffic4,015 by 2046
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Il 2 N B over Rock River built?

It was built in 1966, making it 59 years old in 2025.

What condition is Il 2 N B over Rock River 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 Il 2 N B over Rock River carry?

About 8,550 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Il 2 N B over Rock River?

The structure is 610 ft (185.9 m) long with a longest span of 119 ft (36.4 m) and a deck 36 ft wide.

Who owns Il 2 N B over Rock River?

It is owned by the State Highway Agency.