US Bridges

Usfs RTE 2473 over Big Indian River

Good

Alger County, Michigan · 0.5 MI W of Mirror Lake · Structure no. 091003000003023

Built
2005
20 years old
Condition
Good
inspected September 2024
Type
Arch - Deck
Wood or Timber
Length
32 ft
1 main span
Daily traffic
50
2004 count
Owner
Federal
U.S. Forest Service

About this bridge

Usfs RTE 2473 over Big Indian River is a wood or timber arch - deck carrying Usfs RTE 2473 over Big Indian River in Alger County, Michigan. It was built in 2005, so it is 20 years old, younger 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.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 32 ft (9.8 m) long and 26 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

CarriesUsfs RTE 2473
CrossesBig Indian River
Location0.5 MI W of Mirror Lake
RouteFederal Lands Road 2473
Coordinates46.2712, -86.6949
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.9 US tons
Inventory rating80 US tons

Structure

Structure typeArch - Deck
MaterialWood or Timber
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2004)
Projected traffic75 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 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 Usfs RTE 2473 over Big Indian River built?

It was built in 2005, making it 20 years old in 2025.

What condition is Usfs RTE 2473 over Big Indian 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 September 2024.

How much traffic does Usfs RTE 2473 over Big Indian River carry?

About 50 vehicles per day (2004 count).

How long is Usfs RTE 2473 over Big Indian River?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 26 ft wide.

Who owns Usfs RTE 2473 over Big Indian River?

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