Structure 48006100000000 · Knox County, IL

Henderson RD (ch 3 over I-74

Carries Henderson RD (ch 3 over I-74, 2.5 Mi W Of Wataga.

Overall conditionPoor

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

How ratings work
Decksets the rating3/9 · Serious
Superstructure4/9 · Poor
Substructure5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT223 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 3/9 · sets the ratingSuperstructure 4/9Substructure 5/9

223 ft end to end, longest span 67 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.

Built196561 years old
Length223.1 ft68 m
Daily traffic200counted 2022
Last inspectedDecember 2023every 12 months

Location

StateIllinois
CountyKnox
Location2.5 Mi W Of Wataga
CarriesHenderson RD (ch 3
CrossesI-74
Coordinates41.02405, -90.33478

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length223.1 ft (68 m)
Max Span66.9 ft (20.4 m)
Deck Width29.9 ft (9.1 m)
Deck Area618.8 sq m
Main Spans4
Year Built1965

Traffic

Avg Daily Traffic200 (2022)
Truck Traffic17%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionDecember 2023
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number048006100000000

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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