Structure 56319500000000 · McHenry County, IL

Franklinville RD over Trib Kish River

Carries Franklinville RD over Trib Kish River, 0.1 Mi S Perkins RD.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 8 of 9.

How ratings work
Decksets the rating8/9 · Very Good
Superstructuresets the rating8/9 · Very Good
Substructuresets the rating8/9 · Very Good
Channelnot part of overall9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT65 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 8/9

65 ft end to end, longest span 31 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 slab bridge.

Built201610 years old
Length64.6 ft19.7 m
Daily traffic2,100counted 2024
Last inspectedJuly 2022every 48 months

Location

StateIllinois
CountyMcHenry
Location0.1 Mi S Perkins RD
CarriesFranklinville RD
CrossesTrib Kish River
Coordinates42.27584, -88.51102

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length64.6 ft (19.7 m)
Max Span30.8 ft (9.4 m)
Deck Width32.2 ft (9.8 m)
Deck Area193.1 sq m
Main Spans2
Year Built2016

Traffic

Avg Daily Traffic2,100 (2024)
Truck Traffic15%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2022
Inspection FrequencyEvery 48 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number056319500000000

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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