Structure 9787 · Pine County, MN

I 35 over Grindstone River

Carries I 35 over Grindstone River, 0.3 Mi N Of Jct Th48.

Overall conditionPoor

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

How ratings work
Deck5/9 · Fair
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT114 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

114 ft end to end, longest span 37 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.

Built196066 years old
Length113.5 ft34.6 m
Daily traffic8,150counted 2016
Last inspectedApril 2024every 12 months

Location

StateMinnesota
CountyPine
Location0.3 Mi N Of Jct Th48
CarriesI 35
CrossesGrindstone River
Coordinates46.01557, -92.92986

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length113.5 ft (34.6 m)
Max Span37.4 ft (11.4 m)
Deck Width43.6 ft (13.3 m)
Deck Area460.2 sq m
Main Spans3
Year Built1960

Traffic

Avg Daily Traffic8,150 (2016)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number9787

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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