US Bridges

Cottage Grove Ave over Little Cal Riv

PoorPosted for load

Cook County, Illinois · 0.5 M N US 6 · Structure no. 016080300000000

Built
1932
93 years old
Condition
Poor
inspected October 2024
Type
Tee Beam
Concrete
Length
160 ft
3 main spans
Daily traffic
5,950
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Cottage Grove Ave over Little Cal Riv is a concrete tee beam carrying Cottage Grove Ave over Little Cal Riv in Cook County, Illinois. It was built in 1932, so it is 93 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. Its operating status is: posted for load restriction.

It carries about 5,950 vehicles a day, roughly 2% of them trucks, projected to reach 5,950 by 2046. The structure is 160 ft (48.8 m) long and 56 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCottage Grove Ave
CrossesLittle Cal Riv
Location0.5 M N US 6
Coordinates41.60579, -87.59765
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.9 US tons
Inventory rating17.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length160 ft (48.8 m)
Longest span53 ft (16.2 m)
Deck width56 ft (17.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,950 (2023)
Projected traffic5,950 by 2046
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cottage Grove Ave over Little Cal Riv built?

It was built in 1932, making it 93 years old in 2025.

What condition is Cottage Grove Ave over Little Cal Riv 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 October 2024.

How much traffic does Cottage Grove Ave over Little Cal Riv carry?

About 5,950 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Cottage Grove Ave over Little Cal Riv?

The structure is 160 ft (48.8 m) long with a longest span of 53 ft (16.2 m) and a deck 56 ft wide.

Who owns Cottage Grove Ave over Little Cal Riv?

It is owned by the City or Municipal Highway Agency.