Structure 50700200000000 · LaSalle County, IL

10th ST over First CR

Carries 10th ST over First CR, 10th ST W Of 1st AVE.

Overall conditionPoor

Set by its lowest-rated component: Culvert at 3 of 9.

How ratings work
Culvertsets the rating3/9 · Serious
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
23 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 3/9

A culvert 23 ft across with 2 openings. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.

Built194779 years old
Length23.0 ft7 m
Daily traffic100counted 2020
Last inspectedAugust 2024every 24 months

Location

StateIllinois
CountyLaSalle
Location10th ST W Of 1st AVE
Carries10th ST
CrossesFirst CR
Coordinates41.55242, -89.10936

Physical Characteristics

MaterialConcrete Continuous
DesignCulvert
Total Length23.0 ft (7 m)
Max Span9.8 ft (3 m)
Deck Width43.6 ft (13.3 m)
Deck Area93.1 sq m
Main Spans2
Year Built1947

Traffic

Avg Daily Traffic100 (2020)
Truck Traffic1%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number050700200000000

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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