Structure 90902000001008 · Cook County, MN

Twin Lakes Road over South Brule River

Carries Twin Lakes Road over South Brule River, 6.3 Miles SW Int Csah 12.

Overall conditionPoor

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

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating4/9 · Poor
Substructure6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT35 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 4/9 · sets the ratingSubstructure 6/9

35 ft end to end, longest span 17 ft. 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 multi-beam bridge.

Built1957rebuilt 2000
Length35.1 ft10.7 m
Daily traffic161 lanes
Last inspectedOctober 2024every 24 months

Location

StateMinnesota
CountyCook
Location6.3 Miles SW Int Csah 12
CarriesTwin Lakes Road
CrossesSouth Brule River
Coordinates47.94333, -90.43472

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length35.1 ft (10.7 m)
Max Span17.1 ft (5.2 m)
Deck Width15.1 ft (4.6 m)
Deck Area49.2 sq m
Main Spans2
Year Built1957 (reconstructed 2000)

Traffic

Avg Daily Traffic16
Lanes On Bridge1

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical4 — Foundations need monitoring
Structure Number090902000001008

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.