Structure L2953 · Lyon County, MN

T 21 over Big Cottonwood River

Carries T 21 over Big Cottonwood River, 2.7 Mi S Of Jct Csah 2.

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 overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

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

25 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 multi-beam bridge.

Built197452 years old
Length24.6 ft7.5 m
Daily traffic21counted 1992
Last inspectedOctober 2023every 24 months

Location

StateMinnesota
CountyLyon
Location2.7 Mi S Of Jct Csah 2
CarriesT 21
CrossesBig Cottonwood River
Coordinates44.27300, -95.77516

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length24.6 ft (7.5 m)
Max Span22.3 ft (6.8 m)
Deck Width25.6 ft (7.8 m)
Deck Area58.5 sq m
Main Spans1
Year Built1974

Traffic

Avg Daily Traffic21 (1992)
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 Critical2 — Bridge closed (monitoring)
Structure NumberL2953

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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