US Bridges

FAS-96 (somonauk R over Buck Br Somonauk CR

Poor

DeKalb County, Illinois · 110N 1460E · Structure no. 019304800000000

Built
1996
29 years old
Condition
Poor
inspected March 2023
Type
Channel Beam
Concrete
Length
40 ft
1 main span
Daily traffic
3,250
2021 count
Owner
County
County Highway Agency

About this bridge

FAS-96 (somonauk R over Buck Br Somonauk CR is a concrete channel beam carrying FAS-96 (somonauk R over Buck Br Somonauk CR in DeKalb County, Illinois. It was built in 1996, so it is 29 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 3,250 vehicles a day, roughly 10% of them trucks, projected to reach 3,640 by 2046. The structure is 40 ft (12.1 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFAS-96 (somonauk R
CrossesBuck Br Somonauk CR
Location110N 1460E
RouteCounty Highway 0
CountyDeKalb County
StateIllinois
Coordinates41.64662, -88.66837
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.1 m)
Longest span37 ft (11.3 m)
Deck width34 ft (10.3 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,250 (2021)
Projected traffic3,640 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 FAS-96 (somonauk R over Buck Br Somonauk CR built?

It was built in 1996, making it 29 years old in 2025.

What condition is FAS-96 (somonauk R over Buck Br Somonauk CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does FAS-96 (somonauk R over Buck Br Somonauk CR carry?

About 3,250 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is FAS-96 (somonauk R over Buck Br Somonauk CR?

The structure is 40 ft (12.1 m) long with a longest span of 37 ft (11.3 m) and a deck 34 ft wide.

Who owns FAS-96 (somonauk R over Buck Br Somonauk CR?

It is owned by the County Highway Agency.