US Bridges

Morrow Road over Thunder Bay River N Br

Fair

Montmorency County, Michigan · Sec 10 11 Montmorency Twp · Structure no. 000000000007545

Built
2000
25 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
100
2005 count
Owner
County
County Highway Agency

About this bridge

Morrow Road over Thunder Bay River N Br is a prestressed concrete box beam or girders - multiple carrying Morrow Road over Thunder Bay River N Br in Montmorency 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 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 250 by 2025. The structure is 46 ft (13.9 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMorrow Road
CrossesThunder Bay River N Br
LocationSec 10 11 Montmorency Twp
RouteCounty Highway 0
CountyMontmorency County
StateMichigan
Coordinates45.179, -83.92313
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating44 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length46 ft (13.9 m)
Longest span38 ft (11.7 m)
Deck width31 ft (9.5 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2005)
Projected traffic250 by 2025
Trucks10%
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 Morrow Road over Thunder Bay River N Br built?

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

What condition is Morrow Road over Thunder Bay River N Br 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 Morrow Road over Thunder Bay River N Br carry?

About 100 vehicles per day (2005 count), of which roughly 10% are trucks.

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

The structure is 46 ft (13.9 m) long with a longest span of 38 ft (11.7 m) and a deck 31 ft wide.

Who owns Morrow Road over Thunder Bay River N Br?

It is owned by the County Highway Agency.