Structure 49513 · Morrison County, MN

Csah 21 over S Br Two Rivers

Carries Csah 21 over S Br Two Rivers, 0.2 Mi W Of Jct Csah 24.

Overall conditionPoor

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

How ratings work
Decksets the rating4/9 · Poor
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT105 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 4/9 · sets the ratingSubstructure 5/9

105 ft end to end, longest span 26 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 slab bridge.

Built197056 years old
Length104.7 ft31.9 m
Daily traffic1,050counted 2020
Last inspectedNovember 2024every 12 months

Location

StateMinnesota
CountyMorrison
Location0.2 Mi W Of Jct Csah 24
CarriesCsah 21
CrossesS Br Two Rivers
Coordinates45.80447, -94.41441

Physical Characteristics

MaterialWood or Timber
DesignSlab
Total Length104.7 ft (31.9 m)
Max Span25.9 ft (7.9 m)
Deck Width34.8 ft (10.6 m)
Deck Area338.1 sq m
Main Spans4
Year Built1970

Traffic

Avg Daily Traffic1,050 (2020)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number49513

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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