US Bridges

Fountain St. over Biscayne Bay

Fair

Miami-Dade County, Florida · Palm Is. to Hibiscus Is. · Structure no. 876734

Built
1988
37 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete Continuous
Length
613 ft
18 main spans
Daily traffic
2,145
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Fountain St. over Biscayne Bay is a concrete continuous slab carrying Fountain St. over Biscayne Bay in Miami-Dade County, Florida. It was built in 1988, so it is 37 years old, younger 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 2,145 vehicles a day, roughly 3% of them trucks, projected to reach 3,836 by 2042. The structure is 613 ft (186.8 m) long and 43 ft wide. If it were closed, the detour would be 123 mi (198 km).

Location

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CarriesFountain St.
CrossesBiscayne Bay
LocationPalm Is. to Hibiscus Is.
RouteCity Street 0
CountyMiami-Dade County
StateFlorida
Coordinates25.78168, -80.16142
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.6 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans18
Design loadHS 20
Structure length613 ft (186.8 m)
Longest span34 ft (10.5 m)
Deck width43 ft (13.1 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,145 (2023)
Projected traffic3,836 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123 mi (198 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Fountain St. over Biscayne Bay built?

It was built in 1988, making it 37 years old in 2025.

What condition is Fountain St. over Biscayne Bay 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 June 2023.

How much traffic does Fountain St. over Biscayne Bay carry?

About 2,145 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Fountain St. over Biscayne Bay?

The structure is 613 ft (186.8 m) long with a longest span of 34 ft (10.5 m) and a deck 43 ft wide.

Who owns Fountain St. over Biscayne Bay?

It is owned by the City or Municipal Highway Agency.