US Bridges

Alpine Road over Unnamed Drainageway

Good

Winnebago County, Illinois · 0.1 MI S of Linden RD · Structure no. 101513300000000

Built
1985
40 years old
Condition
Good
inspected August 2021
Type
Culvert
Concrete
Length
25 ft
4 main spans
Daily traffic
6,600
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Alpine Road over Unnamed Drainageway is a concrete culvert carrying Alpine Road over Unnamed Drainageway in Winnebago County, Illinois. It was built in 1985, so it is 40 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,600 vehicles a day, roughly 5% of them trucks, projected to reach 6,969 by 2046. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesAlpine Road
CrossesUnnamed Drainageway
Location0.1 MI S of Linden RD
Coordinates42.21461, -89.02879
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length25 ft (7.5 m)
Longest span4 ft (1.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,600 (2022)
Projected traffic6,969 by 2046
Trucks5%
Lanes on structure4
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 Alpine Road over Unnamed Drainageway built?

It was built in 1985, making it 40 years old in 2025.

What condition is Alpine Road over Unnamed Drainageway in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2021.

How much traffic does Alpine Road over Unnamed Drainageway carry?

About 6,600 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Alpine Road over Unnamed Drainageway?

The structure is 25 ft (7.5 m) long with a longest span of 4 ft (1.2 m).

Who owns Alpine Road over Unnamed Drainageway?

It is owned by the City or Municipal Highway Agency.