Structure 101019000000000 · Winnebago County, IL

Ill 251 over Spring Creek RD

Carries Ill 251 over Spring Creek RD, 1.4 Mi N Whitman ST.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT263 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

263 ft end to end, longest span 71 ft: about 4 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.

Built201214 years old
Length263.5 ft80.3 m
Daily traffic29,700counted 2023
Last inspectedSeptember 2024every 24 months

Location

StateIllinois
CountyWinnebago
Location1.4 Mi N Whitman ST
CarriesIll 251
CrossesSpring Creek RD
Coordinates42.28866, -89.06110

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length263.5 ft (80.3 m)
Max Span70.5 ft (21.5 m)
Deck Width122.0 ft (37.2 m)
Deck Area2987.2 sq m
Main Spans4
Year Built2012

Traffic

Avg Daily Traffic29,700 (2023)
Truck Traffic6%
Lanes On Bridge8
Lanes Under Bridge6

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number101019000000000

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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