Structure 52369200000000 · Lee County, IL

Ch 1 Lost Nation R over Franklin Creek

Carries Ch 1 Lost Nation R over Franklin Creek, 0.8 Mi S Of Ogle Co.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating4/9 · Poor
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT150 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 4/9 · sets the rating

150 ft end to end, longest span 50 ft: about 2 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 box-beam bridge.

Built1957rebuilt 2002
Length149.9 ft45.7 m
Daily traffic1,900counted 2022
Last inspectedFebruary 2024every 24 months

Location

StateIllinois
CountyLee
Location0.8 Mi S Of Ogle Co
CarriesCh 1 Lost Nation R
CrossesFranklin Creek
Coordinates41.89121, -89.39566

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length149.9 ft (45.7 m)
Max Span49.9 ft (15.2 m)
Deck Width29.9 ft (9.1 m)
Deck Area415.9 sq m
Main Spans3
Year Built1957 (reconstructed 2002)

Traffic

Avg Daily Traffic1,900 (2022)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number052369200000000

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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