Structure 49008 · Morrison County, MN

Mn 371 over US 10 WB

Carries Mn 371 over US 10 WB, At Jct TH 371.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT206 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

206 ft end to end, longest span 98 ft: about 3 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 multi-beam bridge.

Built197254 years old
Length206.0 ft62.8 m
Daily traffic5,500counted 2019
Last inspectedJuly 2024every 12 months

Location

StateMinnesota
CountyMorrison
LocationAt Jct TH 371
CarriesMn 371
CrossesUS 10 WB
Coordinates45.99498, -94.34121

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length206.0 ft (62.8 m)
Max Span98.1 ft (29.9 m)
Deck Width44.3 ft (13.5 m)
Deck Area847.8 sq m
Main Spans3
Year Built1972

Traffic

Avg Daily Traffic5,500 (2019)
Truck Traffic8%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number49008

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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