Structure 8330100000000 · Carroll County, IL

Spring Valley Road over East Fork Creek

Carries Spring Valley Road over East Fork Creek, 5 M N Of Lanark.

Overall conditionGood

Set by its lowest-rated component: Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT52 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

52 ft end to end, longest span 25 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 slab bridge.

Built197155 years old
Length51.8 ft15.8 m
Daily traffic175counted 2021
Last inspectedApril 2023every 24 months

Location

StateIllinois
CountyCarroll
Location5 M N Of Lanark
CarriesSpring Valley Road
CrossesEast Fork Creek
Coordinates42.18366, -89.81530

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length51.8 ft (15.8 m)
Max Span24.9 ft (7.6 m)
Deck Width27.9 ft (8.5 m)
Deck Area134.3 sq m
Main Spans2
Year Built1971

Traffic

Avg Daily Traffic175 (2021)
Truck Traffic21%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number008330100000000

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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