Structure 89004400000000 · Stephenson County, IL

Harlem Center RD over Us20 Freeport Bypass

Carries Harlem Center RD over Us20 Freeport Bypass, 3 Mi W Of Il 26.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT231 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 8/9

231 ft end to end, longest span 134 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.

Built198739 years old
Length230.6 ft70.3 m
Daily traffic300counted 2024
Last inspectedOctober 2023every 24 months

Location

StateIllinois
CountyStephenson
Location3 Mi W Of Il 26
CarriesHarlem Center RD
CrossesUs20 Freeport Bypass
Coordinates42.33133, -89.69071

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length230.6 ft (70.3 m)
Max Span133.9 ft (40.8 m)
Deck Width31.2 ft (9.5 m)
Deck Area667.9 sq m
Main Spans2
Year Built1987

Traffic

Avg Daily Traffic300 (2024)
Truck Traffic2%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number089004400000000

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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