Structure 12522 · Boone County, MO

King RD over Sugar CR

Carries King RD over Sugar CR, S 18 T 51 N R 13 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
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT42 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

42 ft end to end, longest span 26 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 multi-beam bridge.

Built1925101 years old
Length42.0 ft12.8 m
Daily traffic10counted 2023
Last inspectedDecember 2024every 24 months

Location

StateMissouri
CountyBoone
LocationS 18 T 51 N R 13 W
CarriesKing RD
CrossesSugar CR
Coordinates39.21231, -92.41292

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length42.0 ft (12.8 m)
Max Span25.9 ft (7.9 m)
Deck Width11.8 ft (3.6 m)
Deck Area46.1 sq m
Main Spans2
Year Built1925

Traffic

Avg Daily Traffic10 (2023)
Truck Traffic10%
Lanes On Bridge1

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical4 — Foundations need monitoring
Structure Number12522

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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