Structure 98006300000000 · Whiteside County, IL

I-88 EB over Tr 136 A / Henry RD

Carries I-88 EB over Tr 136 A / Henry RD, 1.5 Mi W Ill 78.

Overall conditionFair

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

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

Elevation

Side view, colored by inspection rating
CAR · 15 FT113 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

113 ft end to end, longest span 49 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.

Built197551 years old
Length113.2 ft34.5 m
Daily traffic6,550counted 2023
Last inspectedSeptember 2023every 24 months

Location

StateIllinois
CountyWhiteside
Location1.5 Mi W Ill 78
CarriesI-88 EB
CrossesTr 136 A / Henry RD
Coordinates41.71506, -89.99678

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length113.2 ft (34.5 m)
Max Span48.9 ft (14.9 m)
Deck Width42.0 ft (12.8 m)
Deck Area441.6 sq m
Main Spans3
Year Built1975

Traffic

Avg Daily Traffic6,550 (2023)
Truck Traffic34%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number098006300000000

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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