Structure 43000700000000 · Jo Daviess County, IL

US 20 EB over Sinsinawa River

Carries US 20 EB over Sinsinawa River, 2.0 Mi W Jct Ill84.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT212 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

212 ft end to end, longest span 76 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.

Built1966rebuilt 2012
Length211.6 ft64.5 m
Daily traffic8,650counted 2023
Last inspectedSeptember 2023every 24 months

Location

StateIllinois
CountyJo Daviess
Location2.0 Mi W Jct Ill84
CarriesUS 20 EB
CrossesSinsinawa River
Coordinates42.45692, -90.49389

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length211.6 ft (64.5 m)
Max Span75.8 ft (23.1 m)
Deck Width38.1 ft (11.6 m)
Deck Area748.2 sq m
Main Spans3
Year Built1966 (reconstructed 2012)

Traffic

Avg Daily Traffic8,650 (2023)
Truck Traffic12%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number043000700000000

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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