US Bridges

Preserve Road over Br. of Somonauk Crk.

Good

DeKalb County, Illinois · 900N 1110E · Structure no. 019532100000000

Built
2002
23 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
50
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Preserve Road over Br. of Somonauk Crk. is a concrete culvert carrying Preserve Road over Br. of Somonauk Crk. in DeKalb County, Illinois. It was built in 2002, so it is 23 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 50 vehicles a day, projected to reach 56 by 2046. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesPreserve Road
CrossesBr. of Somonauk Crk.
Location900N 1110E
RouteCounty Highway 0
CountyDeKalb County
StateIllinois
Coordinates41.76166, -88.73468
Functional classRural Local

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 inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span14 ft (4.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2021)
Projected traffic56 by 2046
Trucks0%
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

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 Preserve Road over Br. of Somonauk Crk. built?

It was built in 2002, making it 23 years old in 2025.

What condition is Preserve Road over Br. of Somonauk 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 March 2023.

How much traffic does Preserve Road over Br. of Somonauk Crk. carry?

About 50 vehicles per day (2021 count).

How long is Preserve Road over Br. of Somonauk Crk.?

The structure is 30 ft (9.1 m) long with a longest span of 14 ft (4.2 m).

Who owns Preserve Road over Br. of Somonauk Crk.?

It is owned by the Town or Township Highway Agency.