Structure 19205 · Macon County, MO

Michigan ST over Unnamed CR

Carries Michigan ST over Unnamed CR, S 18 T 58 N R 13 W.

Overall conditionPoor

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

How ratings work
Deck7/9 · Good
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
23 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9Substructure 4/9 · sets the rating

23 ft end to end, longest span 13 ft. Lengths are drawn to scale; at this length a semi-truck would be a speck. 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
Length23.0 ft7 m
Daily traffic15counted 2024
Last inspectedDecember 2019every 24 months

Location

StateMissouri
CountyMacon
LocationS 18 T 58 N R 13 W
CarriesMichigan ST
CrossesUnnamed CR
Coordinates39.83811, -92.40152

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length23.0 ft (7 m)
Max Span13.5 ft (4.1 m)
Deck Width13.8 ft (4.2 m)
Deck Area29.4 sq m
Main Spans2
Year Built1925

Traffic

Avg Daily Traffic15 (2024)
Truck Traffic10%
Lanes On Bridge1

Inspection & Ownership

Last InspectionDecember 2019
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number19205

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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