Structure 81012400000000 · Rock Island County, IL

265 ST N Ch 4 over I-88

Carries 265 ST N Ch 4 over I-88, 0.9 Mi SW Jct Ill 92.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT340 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

340 ft end to end, longest span 137 ft: about 5 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.

Built197650 years old
Length339.9 ft103.6 m
Daily traffic175counted 2020
Last inspectedOctober 2024every 24 months

Location

StateIllinois
CountyRock Island
Location0.9 Mi SW Jct Ill 92
Carries265 ST N Ch 4
CrossesI-88
Coordinates41.54775, -90.25297

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length339.9 ft (103.6 m)
Max Span137.1 ft (41.8 m)
Deck Width32.2 ft (9.8 m)
Deck Area1015.3 sq m
Main Spans2
Year Built1976

Traffic

Avg Daily Traffic175 (2020)
Truck Traffic24%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number081012400000000

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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