US Bridges

Hubbard Lake Road over Lwr S Br Thunder Bay Riv

Fair

Alpena County, Michigan · 1 MI N of Hubbard Lake · Structure no. 000000000000345

Built
1948
77 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
82 ft
2 main spans
Daily traffic
1,650
2010 count
Owner
County
County Highway Agency

About this bridge

Hubbard Lake Road over Lwr S Br Thunder Bay Riv is a steel stringer/multi-beam or girder carrying Hubbard Lake Road over Lwr S Br Thunder Bay Riv in Alpena County, Michigan. It was built in 1948, so it is 77 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 1,650 vehicles a day, projected to reach 2,000 by 2030. The structure is 82 ft (25 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesHubbard Lake Road
CrossesLwr S Br Thunder Bay Riv
Location1 MI N of Hubbard Lake
RouteCounty Highway 451
CountyAlpena County
StateMichigan
Coordinates44.88826, -83.58731
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length82 ft (25 m)
Longest span40 ft (12.2 m)
Deck width31 ft (9.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2010)
Projected traffic2,000 by 2030
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Hubbard Lake Road over Lwr S Br Thunder Bay Riv built?

It was built in 1948, making it 77 years old in 2025.

What condition is Hubbard Lake Road over Lwr S Br Thunder Bay Riv 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 August 2024.

How much traffic does Hubbard Lake Road over Lwr S Br Thunder Bay Riv carry?

About 1,650 vehicles per day (2010 count).

How long is Hubbard Lake Road over Lwr S Br Thunder Bay Riv?

The structure is 82 ft (25 m) long with a longest span of 40 ft (12.2 m) and a deck 31 ft wide.

Who owns Hubbard Lake Road over Lwr S Br Thunder Bay Riv?

It is owned by the County Highway Agency.