Structure 20555 · Jackson County, MO

Nebgen RD over Br Of Sni-a-bar CR

Carries Nebgen RD over Br Of Sni-a-bar CR, S 13 T 48 N R 30 W.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT90 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

90 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.

Built1905rebuilt 1990
Length89.9 ft27.4 m
Daily traffic330counted 2024
Last inspectedFebruary 2023every 24 months

Location

StateMissouri
CountyJackson
LocationS 13 T 48 N R 30 W
CarriesNebgen RD
CrossesBr Of Sni-a-bar CR
Coordinates38.96987, -94.17061

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length89.9 ft (27.4 m)
Max Span85.0 ft (25.9 m)
Deck Width29.9 ft (9.1 m)
Deck Area249.3 sq m
Main Spans1
Year Built1905 (reconstructed 1990)

Traffic

Avg Daily Traffic330 (2024)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number20555

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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