Structure 48508 · Mille Lacs County, MN

Csah 19 over Rum River

Carries Csah 19 over Rum River, 0.5 Mi W Of Jct TH 169.

Overall conditionPoor

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

How ratings work
Decksets the rating4/9 · Poor
Superstructure5/9 · Fair
Substructure5/9 · Fair
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT144 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 5/9Substructure 5/9

144 ft end to end, longest span 48 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.

Built197056 years old
Length144.4 ft44 m
Daily traffic300counted 2018
Last inspectedJune 2024every 12 months

Location

StateMinnesota
CountyMille Lacs
Location0.5 Mi W Of Jct TH 169
CarriesCsah 19
CrossesRum River
Coordinates45.90804, -93.67367

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length144.4 ft (44 m)
Max Span48.2 ft (14.7 m)
Deck Width34.1 ft (10.4 m)
Deck Area457.6 sq m
Main Spans3
Year Built1970

Traffic

Avg Daily Traffic300 (2018)
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number48508

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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