Structure 101994200000000 · Winnebago County, IL

Seminary Street over Cn Rr

Carries Seminary Street over Cn Rr, S Central Rockford.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT114 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

114 ft end to end, longest span 24 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 multi-beam bridge.

Built1901rebuilt 2008
Length113.5 ft34.6 m
Daily traffic1,150counted 2022
Last inspectedJuly 2023every 24 months

Location

StateIllinois
CountyWinnebago
LocationS Central Rockford
CarriesSeminary Street
CrossesCn Rr
Coordinates42.25489, -89.09312

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length113.5 ft (34.6 m)
Max Span23.6 ft (7.2 m)
Deck Width55.1 ft (16.8 m)
Deck Area581.3 sq m
Main Spans8
Year Built1901 (reconstructed 2008)

Traffic

Avg Daily Traffic1,150 (2022)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerPrivate
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number101994200000000

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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