Structure 16271200000000 · Cook County, IL

Cottage Grove Av over Deer Crk

Carries Cottage Grove Av over Deer Crk, 0.2 M N Of Sauk Trl.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT109 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 8/9

109 ft end to end, longest span 37 ft. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built200125 years old
Length108.6 ft33.1 m
Daily traffic3,750counted 2022
Last inspectedMay 2023every 48 months

Location

StateIllinois
CountyCook
Location0.2 M N Of Sauk Trl
CarriesCottage Grove Av
CrossesDeer Crk
Coordinates41.48984, -87.59714

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length108.6 ft (33.1 m)
Max Span36.7 ft (11.2 m)
Deck Width62.3 ft (19 m)
Deck Area628.9 sq m
Main Spans3
Year Built2001

Traffic

Avg Daily Traffic3,750 (2022)
Truck Traffic7%
Lanes On Bridge4

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 48 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number016271200000000

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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