US Bridges

Ill 64 over Rock River

Fair

Ogle County, Illinois · E. of Il 2 in Oregon · Structure no. 071008800000000

Built
1998
27 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
992 ft
7 main spans
Daily traffic
9,350
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 64 over Rock River is a steel continuous stringer/multi-beam or girder carrying Ill 64 over Rock River in Ogle County, Illinois. It was built in 1998, so it is 27 years old, younger 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.

It carries about 9,350 vehicles a day, roughly 7% of them trucks, projected to reach 9,984 by 2046. The structure is 992 ft (302.3 m) long and 66 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesIll 64
CrossesRock River
LocationE. of Il 2 in Oregon
RouteState Highway 64
CountyOgle County
StateIllinois
Coordinates42.01451, -89.32861
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating89.3 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length992 ft (302.3 m)
Longest span141 ft (43 m)
Deck width66 ft (20.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,350 (2023)
Projected traffic9,984 by 2046
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemNo

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 Ill 64 over Rock River built?

It was built in 1998, making it 27 years old in 2025.

What condition is Ill 64 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 September 2023.

How much traffic does Ill 64 over Rock River carry?

About 9,350 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Ill 64 over Rock River?

The structure is 992 ft (302.3 m) long with a longest span of 141 ft (43 m) and a deck 66 ft wide.

Who owns Ill 64 over Rock River?

It is owned by the State Highway Agency.