Structure 81012600000000 · Rock Island County, IL

Ch 25 over I-88

Carries Ch 25 over I-88, 5.mi. Sw. Hillsdale.

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 FT248 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

248 ft end to end, longest span 99 ft: about 3 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.

Built1976rebuilt 2022
Length248.0 ft75.6 m
Daily traffic450counted 2020
Last inspectedOctober 2024every 24 months

Location

StateIllinois
CountyRock Island
Location5.mi. Sw. Hillsdale
CarriesCh 25
CrossesI-88
Coordinates41.57056, -90.22331

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length248.0 ft (75.6 m)
Max Span99.1 ft (30.2 m)
Deck Width32.2 ft (9.8 m)
Deck Area740.9 sq m
Main Spans2
Year Built1976 (reconstructed 2022)

Traffic

Avg Daily Traffic450 (2020)
Truck Traffic12%
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 Number081012600000000

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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