US Bridges

Ave "g" over S Br Rock River

Fair

Whiteside County, Illinois · In Sterling · Structure no. 098005200000000

Built
1948
77 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
384 ft
3 main spans
Daily traffic
7,700
2021 count
Owner
State
State Highway Agency

About this bridge

Ave "g" over S Br Rock River is a steel continuous stringer/multi-beam or girder carrying Ave "g" over S Br Rock River in Whiteside County, Illinois. It was built in 1948, so it is 77 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 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 7,700 vehicles a day, roughly 7% of them trucks, projected to reach 7,777 by 2046. The structure is 384 ft (117.1 m) long and 42 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesAve "g"
CrossesS Br Rock River
LocationIn Sterling
CountyWhiteside County
StateIllinois
Coordinates41.78069, -89.70617
Functional classUrban 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 inspectionMarch 2024
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 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 rating81.8 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+4 approach)
Design loadHS 20 + Mod
Structure length384 ft (117.1 m)
Longest span102 ft (31 m)
Deck width42 ft (12.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,700 (2021)
Projected traffic7,777 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ave "g" over S Br Rock River built?

It was built in 1948, making it 77 years old in 2025.

What condition is Ave "g" over S Br 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 March 2024.

How much traffic does Ave "g" over S Br Rock River carry?

About 7,700 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Ave "g" over S Br Rock River?

The structure is 384 ft (117.1 m) long with a longest span of 102 ft (31 m) and a deck 42 ft wide.

Who owns Ave "g" over S Br Rock River?

It is owned by the State Highway Agency.