US Bridges

SR821 NB HEFT31.08 over NW 74 ST Canal

Good

Miami-Dade County, Florida · 4.0 MI N of SR-836 Intchg · Structure no. 870421

Built
1974
51 years old, rebuilt 2023
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
93 ft
1 main span
Daily traffic
54,800
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR821 NB HEFT31.08 over NW 74 ST Canal is a prestressed concrete stringer/multi-beam or girder carrying SR821 NB HEFT31.08 over NW 74 ST Canal in Miami-Dade County, Florida. It was built in 1974 and reconstructed in 2023, so it is 51 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 54,800 vehicles a day, roughly 6% of them trucks, projected to reach 95,078 by 2042. The structure is 93 ft (28.3 m) long and 92 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR821 NB HEFT31.08
CrossesNW 74 ST Canal
Location4.0 MI N of SR-836 Intchg
RouteState Highway 821
CountyMiami-Dade County
StateFlorida
Coordinates25.84064, -80.38702
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.8 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length93 ft (28.3 m)
Longest span93 ft (28.3 m)
Deck width92 ft (28.1 m)
Roadway width89 ft (27.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic54,800 (2024)
Projected traffic95,078 by 2042
Trucks6%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 SR821 NB HEFT31.08 over NW 74 ST Canal built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2023.

What condition is SR821 NB HEFT31.08 over NW 74 ST Canal 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 March 2024.

How much traffic does SR821 NB HEFT31.08 over NW 74 ST Canal carry?

About 54,800 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SR821 NB HEFT31.08 over NW 74 ST Canal?

The structure is 93 ft (28.3 m) long with a longest span of 93 ft (28.3 m) and a deck 92 ft wide.

Who owns SR821 NB HEFT31.08 over NW 74 ST Canal?

It is owned by the State Toll Authority.