US Bridges

Duck Key Drive over Duck Key Channel

Fair

Monroe County, Florida · 0.5 Mile E of US1 Mm 61.1 · Structure no. 904602

Built
1955
70 years old, rebuilt 1982
Condition
Fair
inspected March 2024
Type
Arch - Deck
Concrete
Length
77 ft
3 main spans
Daily traffic
830
2024 count
Owner
County
County Highway Agency

About this bridge

Duck Key Drive over Duck Key Channel is a concrete arch - deck carrying Duck Key Drive over Duck Key Channel 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 830 vehicles a day, roughly 2% of them trucks, projected to reach 1,363 by 2043. The structure is 77 ft (23.5 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesDuck Key Drive
CrossesDuck Key Channel
Location0.5 Mile E of US1 Mm 61.1
RouteCounty Highway 0
StateFlorida
Coordinates24.77285, -80.91431
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
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; extensive scour has occurred
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating43.5 US tons
Inventory rating30.4 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length77 ft (23.5 m)
Longest span28 ft (8.6 m)
Deck width26 ft (8 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic830 (2024)
Projected traffic1,363 by 2043
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Duck Key Drive over Duck Key Channel built?

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

What condition is Duck Key Drive over Duck Key Channel 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 Duck Key Drive over Duck Key Channel carry?

About 830 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Duck Key Drive over Duck Key Channel?

The structure is 77 ft (23.5 m) long with a longest span of 28 ft (8.6 m) and a deck 26 ft wide.

Who owns Duck Key Drive over Duck Key Channel?

It is owned by the County Highway Agency.