Structure 5358 · Itasca County, MN

Csah 9 over Mississippi River (dam)

Carries Csah 9 over Mississippi River (dam), 2.0 Mi W Of Jct TH 46.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT169 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 8/9

169 ft end to end, longest span 28 ft: about 2 semi-trucks nose to tail. 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 slab bridge.

Built1918108 years old
Length169.0 ft51.5 m
Daily traffic930counted 2020
Last inspectedMay 2023every 24 months

Location

StateMinnesota
CountyItasca
Location2.0 Mi W Of Jct TH 46
CarriesCsah 9
CrossesMississippi River (dam)
Coordinates47.42960, -94.05115

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length169.0 ft (51.5 m)
Max Span27.9 ft (8.5 m)
Deck Width45.9 ft (14 m)
Deck Area721 sq m
Main Spans6
Year Built1918

Traffic

Avg Daily Traffic930 (2020)
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number5358

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.