US Bridges

Forest Hill Road over Willow Creek

Good

Winnebago County, Illinois · 1.6 M S Ill 173 · Structure no. 101510300000000

Built
1981
44 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
44 ft
4 main spans
Daily traffic
11,300
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Forest Hill Road over Willow Creek is a concrete culvert carrying Forest Hill Road over Willow Creek in Winnebago County, Illinois. It was built in 1981, so it is 44 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 11,300 vehicles a day, roughly 6% of them trucks, projected to reach 10,908 by 2046. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesForest Hill Road
CrossesWillow Creek
Location1.6 M S Ill 173
CountyWinnebago County
StateIllinois
Coordinates42.34702, -89.01549
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.9 US tons
Inventory rating50.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,300 (2022)
Projected traffic10,908 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Forest Hill Road over Willow Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Forest Hill Road over Willow Creek 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 October 2023.

How much traffic does Forest Hill Road over Willow Creek carry?

About 11,300 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Forest Hill Road over Willow Creek?

The structure is 44 ft (13.4 m) long with a longest span of 12 ft (3.7 m).

Who owns Forest Hill Road over Willow Creek?

It is owned by the City or Municipal Highway Agency.