Structure 6679 · Houston County, MN

Mn 76 over S Fk Root River

Carries Mn 76 over S Fk Root River, 2.8 Mi S Of W Jct TH 16.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT314 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9Substructure 5/9 · sets the rating

314 ft end to end, longest span 100 ft: about 4 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.

Built194878 years old
Length314.0 ft95.7 m
Daily traffic1,386counted 2022
Last inspectedMay 2024every 24 months

Location

StateMinnesota
CountyHouston
Location2.8 Mi S Of W Jct TH 16
CarriesMn 76
CrossesS Fk Root River
Coordinates43.73869, -91.56423

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length314.0 ft (95.7 m)
Max Span100.1 ft (30.5 m)
Deck Width34.8 ft (10.6 m)
Deck Area1014.4 sq m
Main Spans3
Year Built1948

Traffic

Avg Daily Traffic1,386 (2022)
Truck Traffic16%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical3 — Scour critical
Structure Number6679

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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