US Bridges

Seaway Drive over Canal to Seaway Island

Good

Macomb County, Michigan · East End of Seaway Drive · Structure no. 000000000006321

Built
1965
60 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
536
1997 count
Owner
County
County Highway Agency

About this bridge

Seaway Drive over Canal to Seaway Island is a prestressed concrete box beam or girders - multiple carrying Seaway Drive over Canal to Seaway Island in Macomb County, Michigan. It was built in 1965, so it is 60 years old, older 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 536 vehicles a day, roughly 2% of them trucks, projected to reach 722 by 2017. The structure is 36 ft (10.9 m) long and 36 ft wide. If it were closed, the detour would be 124.3 mi (200 km).

Location

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CarriesSeaway Drive
CrossesCanal to Seaway Island
LocationEast End of Seaway Drive
RouteCounty Highway 0
CountyMacomb County
StateMichigan
Coordinates42.57159, -82.8141
Functional classUrban 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 protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating35.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 20
Structure length36 ft (10.9 m)
Longest span31 ft (9.4 m)
Deck width36 ft (10.9 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic536 (1997)
Projected traffic722 by 2017
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed124.3 mi (200 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 Seaway Drive over Canal to Seaway Island built?

It was built in 1965, making it 60 years old in 2025.

What condition is Seaway Drive over Canal to Seaway Island 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 May 2023.

How much traffic does Seaway Drive over Canal to Seaway Island carry?

About 536 vehicles per day (1997 count), of which roughly 2% are trucks.

How long is Seaway Drive over Canal to Seaway Island?

The structure is 36 ft (10.9 m) long with a longest span of 31 ft (9.4 m) and a deck 36 ft wide.

Who owns Seaway Drive over Canal to Seaway Island?

It is owned by the County Highway Agency.