Structure 1516 · Aitkin County, MN

Csah 23 over Chan Between Two Lakes

Carries Csah 23 over Chan Between Two Lakes, 0.5 Mi W Of Jct Csah 38.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT121 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

121 ft end to end, longest span 39 ft. 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 tee-beam bridge.

Built198343 years old
Length121.4 ft37 m
Daily traffic185counted 2022
Last inspectedOctober 2024every 24 months

Location

StateMinnesota
CountyAitkin
Location0.5 Mi W Of Jct Csah 38
CarriesCsah 23
CrossesChan Between Two Lakes
Coordinates46.19581, -93.06121

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length121.4 ft (37 m)
Max Span39.4 ft (12 m)
Deck Width36.1 ft (11 m)
Deck Area407 sq m
Main Spans3
Year Built1983

Traffic

Avg Daily Traffic185 (2022)
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number01516

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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