Structure L9555 · Marshall County, MN

T 237 over Co Ditch # 21

Carries T 237 over Co Ditch # 21, 1.1 Mi S Of Jct CR 103.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
23 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

23 ft end to end. 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 slab bridge.

Built197551 years old
Length23.0 ft7 m
Daily traffic31counted 1994
Last inspectedOctober 2023every 24 months

Location

StateMinnesota
CountyMarshall
Location1.1 Mi S Of Jct CR 103
CarriesT 237
CrossesCo Ditch # 21
Coordinates48.22396, -96.91270

Physical Characteristics

MaterialWood or Timber
DesignSlab
Total Length23.0 ft (7 m)
Max Span22.0 ft (6.7 m)
Deck Width29.9 ft (9.1 m)
Deck Area63.7 sq m
Main Spans1
Year Built1975

Traffic

Avg Daily Traffic31 (1994)
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure NumberL9555

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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