US Bridges

Cass Av over Sawmill Creek

Fair

DuPage County, Illinois · 0.5 M S of I-55 · Structure no. 022310500000000

Built
1991
34 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete Continuous
Length
43 ft
3 main spans
Daily traffic
14,000
2024 count
Owner
County
County Highway Agency

About this bridge

Cass Av over Sawmill Creek is a concrete continuous culvert carrying Cass Av over Sawmill Creek in DuPage County, Illinois. It was built in 1991, so it is 34 years old, younger 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 5 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 14,000 vehicles a day, roughly 7% of them trucks, projected to reach 12,625 by 2046. The structure is 43 ft (13 m) long and 71 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCass Av
CrossesSawmill Creek
Location0.5 M S of I-55
CountyDuPage County
StateIllinois
Coordinates41.72543, -87.97186
Functional classUrban Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating42.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length43 ft (13 m)
Longest span14 ft (4.3 m)
Deck width71 ft (21.5 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,000 (2024)
Projected traffic12,625 by 2046
Trucks7%
Lanes on structure3
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 Cass Av over Sawmill Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is Cass Av over Sawmill Creek 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 September 2024.

How much traffic does Cass Av over Sawmill Creek carry?

About 14,000 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Cass Av over Sawmill Creek?

The structure is 43 ft (13 m) long with a longest span of 14 ft (4.3 m) and a deck 71 ft wide.

Who owns Cass Av over Sawmill Creek?

It is owned by the County Highway Agency.