US Bridges

Chatham ST over Cal Slough

Poor

Cook County, Illinois · 0.1 M S 136th P24 · Structure no. 016680100000000

Built
1963
62 years old
Condition
Poor
inspected August 2023
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
750
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Chatham ST over Cal Slough is a concrete slab carrying Chatham ST over Cal Slough in Cook County, Illinois. It was built in 1963, so it is 62 years old, older 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 4 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 750 vehicles a day, roughly 16% of them trucks, projected to reach 808 by 2046. The structure is 32 ft (9.8 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesChatham ST
CrossesCal Slough
Location0.1 M S 136th P24
RouteCity Street 0
CountyCook County
StateIllinois
Coordinates41.64464, -87.67514
Functional classUrban Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width47 ft (14.3 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2022)
Projected traffic808 by 2046
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Chatham ST over Cal Slough built?

It was built in 1963, making it 62 years old in 2025.

What condition is Chatham ST over Cal Slough 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 August 2023.

How much traffic does Chatham ST over Cal Slough carry?

About 750 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Chatham ST over Cal Slough?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 47 ft wide.

Who owns Chatham ST over Cal Slough?

It is owned by the City or Municipal Highway Agency.