US Bridges

Harrison Ave over Rock River

Fair

Winnebago County, Illinois · 0.2 MI E of Ill Rt 2 · Structure no. 101613000000000

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
798 ft
6 main spans
Daily traffic
10,200
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Harrison Ave over Rock River is a steel stringer/multi-beam or girder carrying Harrison Ave over Rock River in Winnebago County, Illinois. It was built in 1975, so it is 50 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.

It carries about 10,200 vehicles a day, roughly 9% of them trucks, projected to reach 9,191 by 2046. The structure is 798 ft (243.2 m) long and 65 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHarrison Ave
CrossesRock River
Location0.2 MI E of Ill Rt 2
CountyWinnebago County
StateIllinois
Coordinates42.23764, -89.10461
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 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 rating72.5 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length798 ft (243.2 m)
Longest span133 ft (40.5 m)
Deck width65 ft (19.8 m)
Roadway width57 ft (17.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,200 (2022)
Projected traffic9,191 by 2046
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Harrison Ave over Rock River built?

It was built in 1975, making it 50 years old in 2025.

What condition is Harrison Ave 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 July 2023.

How much traffic does Harrison Ave over Rock River carry?

About 10,200 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Harrison Ave over Rock River?

The structure is 798 ft (243.2 m) long with a longest span of 133 ft (40.5 m) and a deck 65 ft wide.

Who owns Harrison Ave over Rock River?

It is owned by the City or Municipal Highway Agency.