US Bridges

Forest Road 3340 over Tamarack River

GoodPosted for load

Gogebic County, Michigan · 8 MI E of Watersmeet · Structure no. 090706000001007

Built
1955
70 years old, rebuilt 1995
Condition
Good
inspected July 2024
Type
Tee Beam
Concrete
Length
45 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 3340 over Tamarack River is a concrete tee beam carrying Forest Road 3340 over Tamarack River in Gogebic County, Michigan. It was built in 1955 and reconstructed in 1995, so it is 70 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 45 ft (13.7 m) long and 16 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesForest Road 3340
CrossesTamarack River
Location8 MI E of Watersmeet
RouteFederal Lands Road 3340
CountyGogebic County
StateMichigan
Coordinates46.28683, -89.01174
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating20.7 US tons
Inventory rating15.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length45 ft (13.7 m)
Longest span43 ft (13.1 m)
Deck width16 ft (5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Forest Road 3340 over Tamarack River built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1995.

What condition is Forest Road 3340 over Tamarack River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does Forest Road 3340 over Tamarack River carry?

About 50 vehicles per day (latest count).

How long is Forest Road 3340 over Tamarack River?

The structure is 45 ft (13.7 m) long with a longest span of 43 ft (13.1 m) and a deck 16 ft wide.

Who owns Forest Road 3340 over Tamarack River?

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