US Bridges

South Stony Road over Stony River

Fair

Lake County, Minnesota · 3.0 MI SE of JCT TH 1 · Structure no. 090907000001031

Built
1959
66 years old
Condition
Fair
inspected September 2024
Type
Girder and Floorbeam System
Steel
Length
51 ft
1 main span
Daily traffic
5
1973 count
Owner
Federal
U.S. Forest Service

About this bridge

South Stony Road over Stony River is a steel girder and floorbeam system carrying South Stony Road over Stony River in Lake County, Minnesota. It was built in 1959, so it is 66 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5 vehicles a day, projected to reach 7 by 2045. The structure is 51 ft (15.4 m) long and 16 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

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CarriesSouth Stony Road
CrossesStony River
Location3.0 MI SE of JCT TH 1
RouteFederal Lands Road 393
CountyLake County
StateMinnesota
Coordinates47.6067, -91.4751
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating44 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length51 ft (15.4 m)
Longest span49 ft (14.9 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (1973)
Projected traffic7 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was South Stony Road over Stony River built?

It was built in 1959, making it 66 years old in 2025.

What condition is South Stony Road over Stony River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does South Stony Road over Stony River carry?

About 5 vehicles per day (1973 count).

How long is South Stony Road over Stony River?

The structure is 51 ft (15.4 m) long with a longest span of 49 ft (14.9 m) and a deck 16 ft wide.

Who owns South Stony Road over Stony River?

It is owned by the U.S. Forest Service.