Structure 932 · Martin County, MN

T 69 over Ditch

Carries T 69 over Ditch, 0.1 Mi S Of Jct TH 4.

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 overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT33 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

33 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 girder bridge.

Built1914112 years old
Length33.1 ft10.1 m
Daily traffic24counted 1988
Last inspectedSeptember 2024every 12 months

Location

StateMinnesota
CountyMartin
Location0.1 Mi S Of Jct TH 4
CarriesT 69
CrossesDitch
Coordinates43.64742, -94.75429

Physical Characteristics

MaterialConcrete
DesignGirder and Floorbeam
Total Length33.1 ft (10.1 m)
Max Span29.9 ft (9.1 m)
Deck Width19.7 ft (6 m)
Deck Area60.6 sq m
Main Spans1
Year Built1914

Traffic

Avg Daily Traffic24 (1988)
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 12 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number932

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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