US Bridges

Scott Road over Lwr S Br Thunder Bay Riv

Good

Alpena County, Michigan · 8 MI West of US-23 · Structure no. 000000000000354

Built
2000
25 years old
Condition
Good
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
91 ft
1 main span
Daily traffic
300
2010 count
Owner
County
County Highway Agency

About this bridge

Scott Road over Lwr S Br Thunder Bay Riv is a prestressed concrete box beam or girders - multiple carrying Scott Road over Lwr S Br Thunder Bay Riv in Alpena County, Michigan. It was built in 2000, so it is 25 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 300 vehicles a day, projected to reach 350 by 2030. The structure is 91 ft (27.7 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesScott Road
CrossesLwr S Br Thunder Bay Riv
Location8 MI West of US-23
RouteCounty Highway 0
CountyAlpena County
StateMichigan
Coordinates44.87362, -83.59253
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating68.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span90 ft (27.3 m)
Deck width31 ft (9.5 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2010)
Projected traffic350 by 2030
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Scott Road over Lwr S Br Thunder Bay Riv built?

It was built in 2000, making it 25 years old in 2025.

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

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

About 300 vehicles per day (2010 count).

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

The structure is 91 ft (27.7 m) long with a longest span of 90 ft (27.3 m) and a deck 31 ft wide.

Who owns Scott Road over Lwr S Br Thunder Bay Riv?

It is owned by the County Highway Agency.