US Bridges

SR934 EB (870084) over East Biscayne Bay

Poor

Miami-Dade County, Florida · E. of North Bay Island · Structure no. 870550

Built
1971
54 years old
Condition
Poor
inspected October 2024
Type
Slab
Prestressed Concrete
Length
510 ft
17 main spans
Daily traffic
22,500
2022 count
Owner
State
State Highway Agency

About this bridge

SR934 EB (870084) over East Biscayne Bay is a prestressed concrete slab carrying SR934 EB (870084) over East Biscayne Bay in Miami-Dade County, Florida. It was built in 1971, so it is 54 years old, older than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 22,500 vehicles a day, roughly 3% of them trucks, projected to reach 39,038 by 2044. The structure is 510 ft (155.4 m) long and 52 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR934 EB (870084)
CrossesEast Biscayne Bay
LocationE. of North Bay Island
RouteState Highway 934
CountyMiami-Dade County
StateFlorida
Coordinates25.84849, -80.15623
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating36.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans17
Design loadHL 93
Structure length510 ft (155.4 m)
Longest span30 ft (9.2 m)
Deck width52 ft (15.8 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,500 (2022)
Projected traffic39,038 by 2044
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SR934 EB (870084) over East Biscayne Bay built?

It was built in 1971, making it 54 years old in 2025.

What condition is SR934 EB (870084) over East Biscayne Bay in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does SR934 EB (870084) over East Biscayne Bay carry?

About 22,500 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is SR934 EB (870084) over East Biscayne Bay?

The structure is 510 ft (155.4 m) long with a longest span of 30 ft (9.2 m) and a deck 52 ft wide.

Who owns SR934 EB (870084) over East Biscayne Bay?

It is owned by the State Highway Agency.