US Bridges

North Alpine over Branch of Keith Crk

Good

Winnebago County, Illinois · .5 MI N of State ST · Structure no. 101606800000000

Built
2018
7 years old
Condition
Good
inspected August 2021
Type
Culvert
Concrete
Length
34 ft
3 main spans
Daily traffic
19,000
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

North Alpine over Branch of Keith Crk is a concrete culvert carrying North Alpine over Branch of Keith Crk in Winnebago County, Illinois. It was built in 2018, so it is 7 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 19,000 vehicles a day, roughly 3% of them trucks, projected to reach 21,412 by 2046. The structure is 34 ft (10.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNorth Alpine
CrossesBranch of Keith Crk
Location.5 MI N of State ST
Coordinates42.26994, -89.02902
Functional classUrban Other Principal 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.
Culvert8 Very GoodNo problems noted.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97.9 US tons
Inventory rating76.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 25 or greater
Structure length34 ft (10.5 m)
Longest span0 ft (0 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,000 (2022)
Projected traffic21,412 by 2046
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 North Alpine over Branch of Keith Crk built?

It was built in 2018, making it 7 years old in 2025.

What condition is North Alpine over Branch of Keith Crk 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 North Alpine over Branch of Keith Crk carry?

About 19,000 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is North Alpine over Branch of Keith Crk?

The structure is 34 ft (10.5 m) long.

Who owns North Alpine over Branch of Keith Crk?

It is owned by the City or Municipal Highway Agency.