Structure 4516 · Beltrami County, MN

Csah 20 over Turtle River

Carries Csah 20 over Turtle River, 5.5 Mi E Of Jct Csah 27.

Overall conditionGood

Set by its lowest-rated component: Deck and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT96 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

96 ft end to end. 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.

Built199234 years old
Length95.8 ft29.2 m
Daily traffic310counted 2018
Last inspectedJune 2023every 24 months

Location

StateMinnesota
CountyBeltrami
Location5.5 Mi E Of Jct Csah 27
CarriesCsah 20
CrossesTurtle River
Coordinates47.54251, -94.59804

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length95.8 ft (29.2 m)
Max Span92.8 ft (28.3 m)
Deck Width36.1 ft (11 m)
Deck Area321.2 sq m
Main Spans1
Year Built1992

Traffic

Avg Daily Traffic310 (2018)
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number04516

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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