US Bridges

Seaview Drive over Duck Key Canal

Fair

Monroe County, Florida · 1.4MILES E of US-1 MM61 · Structure no. 904606

Built
1955
70 years old, rebuilt 1982
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
56 ft
1 main span
Daily traffic
530
2024 count
Owner
County
County Highway Agency

About this bridge

Seaview Drive over Duck Key Canal is a steel stringer/multi-beam or girder carrying Seaview Drive over Duck Key Canal in Monroe County, Florida. It was built in 1955 and reconstructed in 1982, so it is 70 years old, older than the Florida average of 41.3 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 530 vehicles a day, roughly 2% of them trucks, projected to reach 765 by 2042. The structure is 56 ft (17.1 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesSeaview Drive
CrossesDuck Key Canal
Location1.4MILES E of US-1 MM61
RouteCounty Highway 0
CountyMonroe County
StateFlorida
Coordinates24.76691, -80.91216
Functional classUrban 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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating72 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span56 ft (17.1 m)
Deck width28 ft (8.5 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic530 (2024)
Projected traffic765 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Seaview Drive over Duck Key Canal built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1982.

What condition is Seaview Drive over Duck Key Canal 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 March 2024.

How much traffic does Seaview Drive over Duck Key Canal carry?

About 530 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Seaview Drive over Duck Key Canal?

The structure is 56 ft (17.1 m) long with a longest span of 56 ft (17.1 m) and a deck 28 ft wide.

Who owns Seaview Drive over Duck Key Canal?

It is owned by the County Highway Agency.