US Bridges

I-75 NB over SR-821

Good

Miami-Dade County, Florida · 0.5MI S of Broward Co.Lin · Structure no. 870598

Built
1983
42 years old, rebuilt 2017
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
336 ft
4 main spans
Daily traffic
75,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over SR-821 is a prestressed concrete stringer/multi-beam or girder carrying I-75 NB over SR-821 in Miami-Dade County, Florida. It was built in 1983 and reconstructed in 2017, so it is 42 years old, older than the Florida average of 41.3 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 75,000 vehicles a day, roughly 7% of them trucks, projected to reach 130,125 by 2044. The structure is 336 ft (102.4 m) long and 79 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
CrossesSR-821
Location0.5MI S of Broward Co.Lin
RouteInterstate 75
CountyMiami-Dade County
StateFlorida
Coordinates25.94894, -80.35099
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length336 ft (102.4 m)
Longest span116 ft (35.3 m)
Deck width79 ft (24.1 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deck17 ft (5.3 m)

Traffic and service

Average daily traffic75,000 (2024)
Projected traffic130,125 by 2044
Trucks7%
Lanes on structure5
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 NB over SR-821 built?

It was built in 1983, making it 42 years old in 2025. It was reconstructed in 2017.

What condition is I-75 NB over SR-821 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 August 2024.

How much traffic does I-75 NB over SR-821 carry?

About 75,000 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is I-75 NB over SR-821?

The structure is 336 ft (102.4 m) long with a longest span of 116 ft (35.3 m) and a deck 79 ft wide.

Who owns I-75 NB over SR-821?

It is owned by the State Highway Agency.