US Bridges

Metzke Road over N Br Thunder Bay River

Fair

Alpena County, Michigan · 2.3 MI S & 1 MI W Bolton · Structure no. 000000000000352

Built
1984
41 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
150
2010 count
Owner
County
County Highway Agency

About this bridge

Metzke Road over N Br Thunder Bay River is a prestressed concrete box beam or girders - multiple carrying Metzke Road over N Br Thunder Bay River in Alpena County, Michigan. It was built in 1984, so it is 41 years old, younger 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 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 150 vehicles a day, projected to reach 200 by 2010. The structure is 50 ft (15.2 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesMetzke Road
CrossesN Br Thunder Bay River
Location2.3 MI S & 1 MI W Bolton
RouteCounty Highway 0
CountyAlpena County
StateMichigan
Coordinates45.1472, -83.60867
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span46 ft (14 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2010)
Projected traffic200 by 2010
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Metzke Road over N Br Thunder Bay River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Metzke Road over N Br Thunder Bay 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 August 2024.

How much traffic does Metzke Road over N Br Thunder Bay River carry?

About 150 vehicles per day (2010 count).

How long is Metzke Road over N Br Thunder Bay River?

The structure is 50 ft (15.2 m) long with a longest span of 46 ft (14 m) and a deck 34 ft wide.

Who owns Metzke Road over N Br Thunder Bay River?

It is owned by the County Highway Agency.