Structure 16644100000000 · Cook County, IL

I-90 Skyway over Ground SE 75th ST

Carries I-90 Skyway over Ground SE 75th ST, 0.08 M SE 75th P7c.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT272 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

272 ft end to end, longest span 106 ft: about 4 semi-trucks nose to tail. Lengths and the semi-truck 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.

Built1958rebuilt 2002
Length272.0 ft82.9 m
Daily traffic28,700counted 2020
Last inspectedSeptember 2023every 24 months

Location

StateIllinois
CountyCook
Location0.08 M SE 75th P7c
CarriesI-90 Skyway
CrossesGround SE 75th ST
Coordinates41.75756, -87.59666

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length272.0 ft (82.9 m)
Max Span105.6 ft (32.2 m)
Deck Width82.3 ft (25.1 m)
Deck Area2080.8 sq m
Main Spans3
Year Built1958 (reconstructed 2002)

Traffic

Avg Daily Traffic28,700 (2020)
Truck Traffic16%
Lanes On Bridge6

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number016644100000000

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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