Structure 101613600000000 · Winnebago County, IL

Whitman ST over Rock River

Carries Whitman ST over Rock River, 0.03 Mi W Of N Main.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructuresets the rating5/9 · Fair
Substructure6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT742 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9 · sets the ratingSubstructure 6/9

742 ft end to end, longest span 141 ft: about 2.1 football fields. 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.

Built1960rebuilt 2000
Length742.1 ft226.2 m
Daily traffic19,400counted 2022
Last inspectedOctober 2023every 24 months

Location

StateIllinois
CountyWinnebago
Location0.03 Mi W Of N Main
CarriesWhitman ST
CrossesRock River
Coordinates42.27831, -89.08636

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length742.1 ft (226.2 m)
Max Span141.1 ft (43 m)
Deck Width70.9 ft (21.6 m)
Deck Area4885.9 sq m
Main Spans7
Year Built1960 (reconstructed 2000)

Traffic

Avg Daily Traffic19,400 (2022)
Truck Traffic4%
Lanes On Bridge4

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number101613600000000

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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