US Bridges

Usfs RTE 3303 over Brevoort River

Fair

Mackinac County, Michigan · 1.3 MI W CO RTE H57 · Structure no. 091005000001061

Built
1963
62 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
22 ft
1 main span
Daily traffic
10
1998 count
Owner
Federal
U.S. Forest Service

About this bridge

Usfs RTE 3303 over Brevoort River is a wood or timber stringer/multi-beam or girder carrying Usfs RTE 3303 over Brevoort River in Mackinac County, Michigan. It was built in 1963, so it is 62 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 10 vehicles a day, projected to reach 15 by 2018. The structure is 22 ft (6.7 m) long and 25 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesUsfs RTE 3303
CrossesBrevoort River
Location1.3 MI W CO RTE H57
RouteFederal Lands Road 3303
CountyMackinac County
StateMichigan
Coordinates45.97778, -84.92581
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 20
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (1998)
Projected traffic15 by 2018
Trucks—
Lanes on structure2
Traffic directionTwo-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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$14,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Usfs RTE 3303 over Brevoort River built?

It was built in 1963, making it 62 years old in 2025.

What condition is Usfs RTE 3303 over Brevoort 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 November 2023.

How much traffic does Usfs RTE 3303 over Brevoort River carry?

About 10 vehicles per day (1998 count).

How long is Usfs RTE 3303 over Brevoort River?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 25 ft wide.

Who owns Usfs RTE 3303 over Brevoort River?

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