US Bridges

Central Av over Trib "c" Cal Sag

Good

Cook County, Illinois · 0.3 M N 147th ST · Structure no. 016326900000000

Built
1997
28 years old
Condition
Good
inspected June 2023
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
5,300
2022 count
Owner
County
County Highway Agency

About this bridge

Central Av over Trib "c" Cal Sag is a concrete continuous culvert carrying Central Av over Trib "c" Cal Sag in Cook County, Illinois. It was built in 1997, so it is 28 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 5,300 vehicles a day, roughly 2% of them trucks, projected to reach 6,666 by 2046. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCentral Av
CrossesTrib "c" Cal Sag
Location0.3 M N 147th ST
Coordinates41.62921, -87.75687
Functional classUrban Collector

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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJune 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 rating107.1 US tons
Inventory rating73.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length24 ft (7.3 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 traffic5,300 (2022)
Projected traffic6,666 by 2046
Trucks2%
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 Central Av over Trib "c" Cal Sag built?

It was built in 1997, making it 28 years old in 2025.

What condition is Central Av over Trib "c" Cal Sag 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 June 2023.

How much traffic does Central Av over Trib "c" Cal Sag carry?

About 5,300 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Central Av over Trib "c" Cal Sag?

The structure is 24 ft (7.3 m) long with a longest span of 12 ft (3.7 m).

Who owns Central Av over Trib "c" Cal Sag?

It is owned by the County Highway Agency.