Structure L3275 · Dakota County, MN

Permanently Closed over Cannon River

Carries Permanently Closed over Cannon River, 0.1 Mi SE Of Jct Csah 47.

Overall conditionPoor

Set by its lowest-rated component: Deck at 2 of 9.

How ratings work
Decksets the rating2/9 · Critical
Superstructure5/9 · Fair
Substructure4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT143 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 2/9 · sets the ratingSuperstructure 5/9Substructure 4/9

143 ft end to end. Lengths and the semi-truck 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 through truss.

Built1909117 years old
Length143.0 ft43.6 m
Daily traffic1counted 1996
Last inspectedJanuary 2009every 12 months

Location

StateMinnesota
CountyDakota
Location0.1 Mi SE Of Jct Csah 47
CarriesPermanently Closed
CrossesCannon River
Coordinates44.48750, -93.12845

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length143.0 ft (43.6 m)
Max Span137.1 ft (41.8 m)
Deck Width16.1 ft (4.9 m)
Deck Area213.6 sq m
Main Spans1
Year Built1909

Traffic

Avg Daily Traffic1 (1996)
Truck Traffic6%
Lanes On Bridge1

Inspection & Ownership

Last InspectionJanuary 2009
Inspection FrequencyEvery 12 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour Critical8 — Stable, low risk
Structure NumberL3275

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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