US Bridges

Willoughby RD over Unnamed CR

Fair

Ogle County, Illinois · 2.5 MI NE Monroe Cen · Structure no. 071504900000000

Built
1959
66 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
150
2017 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Willoughby RD over Unnamed CR is a concrete continuous culvert carrying Willoughby RD over Unnamed CR in Ogle County, Illinois. It was built in 1959, so it is 66 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 6 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 150 vehicles a day, projected to reach 156 by 2046. The structure is 31 ft (9.5 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesWilloughby RD
CrossesUnnamed CR
Location2.5 MI NE Monroe Cen
RouteCounty Highway 0
CountyOgle County
StateIllinois
Coordinates42.12663, -88.96396
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating39.7 US tons
Inventory rating23.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 15
Structure length31 ft (9.5 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2017)
Projected traffic156 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Willoughby RD over Unnamed CR built?

It was built in 1959, making it 66 years old in 2025.

What condition is Willoughby RD over Unnamed CR 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 Willoughby RD over Unnamed CR carry?

About 150 vehicles per day (2017 count).

How long is Willoughby RD over Unnamed CR?

The structure is 31 ft (9.5 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns Willoughby RD over Unnamed CR?

It is owned by the Town or Township Highway Agency.