US Bridges

Gilbert Ave over NW Drainageway

Poor

Winnebago County, Illinois · 0.25 MI W of Kilburn · Structure no. 101600200000000

Built
1962
63 years old
Condition
Poor
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
1,150
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Gilbert Ave over NW Drainageway is a prestressed concrete box beam or girders - multiple carrying Gilbert Ave over NW Drainageway in Winnebago County, Illinois. It was built in 1962, so it is 63 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,150 vehicles a day, roughly 6% of them trucks, projected to reach 1,162 by 2046. The structure is 31 ft (9.4 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGilbert Ave
CrossesNW Drainageway
Location0.25 MI W of Kilburn
CountyWinnebago County
StateIllinois
Coordinates42.29562, -89.11105
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating25 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width42 ft (12.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,150 (2022)
Projected traffic1,162 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Gilbert Ave over NW Drainageway built?

It was built in 1962, making it 63 years old in 2025.

What condition is Gilbert Ave over NW Drainageway in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does Gilbert Ave over NW Drainageway carry?

About 1,150 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Gilbert Ave over NW Drainageway?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 42 ft wide.

Who owns Gilbert Ave over NW Drainageway?

It is owned by the City or Municipal Highway Agency.