Structure 32885 · St. Louis County, MO

Forest Knoll DR over Fenton CR

Carries Forest Knoll DR over Fenton CR, S 34 T 44 N R 5 E.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT69 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 6/9 · sets the rating

69 ft end to end. 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 multi-beam bridge.

Built200323 years old
Length68.9 ft21 m
Daily traffic6,700counted 2023
Last inspectedNovember 2023every 24 months

Location

StateMissouri
CountySt. Louis
LocationS 34 T 44 N R 5 E
CarriesForest Knoll DR
CrossesFenton CR
Coordinates38.51509, -90.44972

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length68.9 ft (21 m)
Max Span66.6 ft (20.3 m)
Deck Width85.6 ft (26.1 m)
Deck Area548.1 sq m
Main Spans1
Year Built2003

Traffic

Avg Daily Traffic6,700 (2023)
Truck Traffic4%
Lanes On Bridge4

Inspection & Ownership

Last InspectionNovember 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical7 — Countermeasures installed
Structure Number32885

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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