Structure 60505 · Polk County, MN

Csah 15 over Red Lake River

Carries Csah 15 over Red Lake River, 0.1 Mi W Of Jct Csah 61.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,226 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

1,226 ft end to end, longest span 130 ft: about 3.4 football fields. 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 girder bridge.

Built196858 years old
Length1225.7 ft373.6 m
Daily traffic477counted 2022
Last inspectedOctober 2024every 12 months

Location

StateMinnesota
CountyPolk
Location0.1 Mi W Of Jct Csah 61
CarriesCsah 15
CrossesRed Lake River
Coordinates47.80065, -96.80936

Physical Characteristics

MaterialSteel Continuous
DesignGirder and Floorbeam
Total Length1225.7 ft (373.6 m)
Max Span129.9 ft (39.6 m)
Deck Width34.1 ft (10.4 m)
Deck Area3885.4 sq m
Main Spans2
Year Built1968

Traffic

Avg Daily Traffic477 (2022)
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number60505

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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