Structure 6410 · Clay County, MO

Sp 69 S over Is 35

Carries Sp 69 S over Is 35, S 32 T 51 N R 32 W.

Overall conditionPoor

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

How ratings work
Deck5/9 · Fair
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT406 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

406 ft end to end, longest span 120 ft: about 6 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.

Built1954rebuilt 1977
Length405.8 ft123.7 m
Daily traffic1,934counted 2024
Last inspectedSeptember 2024every 24 months

Location

StateMissouri
CountyClay
LocationS 32 T 51 N R 32 W
CarriesSp 69 S
CrossesIs 35
Coordinates39.18720, -94.51664

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length405.8 ft (123.7 m)
Max Span120.1 ft (36.6 m)
Deck Width32.5 ft (9.9 m)
Deck Area1224.6 sq m
Main Spans4
Year Built1954 (reconstructed 1977)

Traffic

Avg Daily Traffic1,934 (2024)
Truck Traffic5%
Lanes On Bridge1
Lanes Under Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number6410

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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