Structure 32450600000000 · Grundy County, IL

Tr 77 over Claypool Ditch

Carries Tr 77 over Claypool Ditch, 0.50 Mi.e. Gorman RD.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 3 of 9.

How ratings work
Deck5/9 · Fair
Superstructuresets the rating3/9 · Serious
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT68 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 3/9 · sets the ratingSubstructure 7/9

68 ft end to end, longest span 22 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.

Built200125 years old
Length67.9 ft20.7 m
Daily traffic250counted 2024
Last inspectedOctober 2024every 24 months

Location

StateIllinois
CountyGrundy
Location0.50 Mi.e. Gorman RD
CarriesTr 77
CrossesClaypool Ditch
Coordinates41.30862, -88.33337

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length67.9 ft (20.7 m)
Max Span22.0 ft (6.7 m)
Deck Width26.2 ft (8 m)
Deck Area165.6 sq m
Main Spans3
Year Built2001

Traffic

Avg Daily Traffic250 (2024)
Truck Traffic18%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number032450600000000

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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