US Bridges

Il 92 over Rock River

Fair

Henry County, Illinois · Henry/Rock Is. CO LN · Structure no. 037014900000000

Built
1997
28 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,120 ft
7 main spans
Daily traffic
2,200
2023 count
Owner
State
State Highway Agency

About this bridge

Il 92 over Rock River is a steel continuous stringer/multi-beam or girder carrying Il 92 over Rock River in Henry County, Illinois. It was built in 1997, so it is 28 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 2,200 vehicles a day, roughly 10% of them trucks, projected to reach 2,214 by 2046. The structure is 1,120 ft (341.5 m) long and 35 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesIl 92
CrossesRock River
LocationHenry/Rock Is. CO LN
RouteState Highway 92
CountyHenry County
StateIllinois
Coordinates41.55598, -90.18479
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating46.7 US tons
Inventory rating28.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length1,120 ft (341.5 m)
Longest span174 ft (53 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic2,214 by 2046
Trucks10%
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

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 92 over Rock River built?

It was built in 1997, making it 28 years old in 2025.

What condition is Il 92 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 92 over Rock River carry?

About 2,200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 92 over Rock River?

The structure is 1,120 ft (341.5 m) long with a longest span of 174 ft (53 m) and a deck 35 ft wide.

Who owns Il 92 over Rock River?

It is owned by the State Highway Agency.