US Bridges

SR821 Sbhft R 31.1 over NW 74th ST Canal

Good

Miami-Dade County, Florida · SB Exit 31 to NW 74th St. · Structure no. 870910

Built
2008
17 years old, rebuilt 2023
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
93 ft
1 main span
Daily traffic
4,000
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR821 Sbhft R 31.1 over NW 74th ST Canal is a prestressed concrete stringer/multi-beam or girder carrying SR821 Sbhft R 31.1 over NW 74th ST Canal in Miami-Dade County, Florida. It was built in 2008 and reconstructed in 2023, so it is 17 years old, younger 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 4,000 vehicles a day, roughly 6% of them trucks, projected to reach 6,940 by 2042. The structure is 93 ft (28.3 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR821 Sbhft R 31.1
CrossesNW 74th ST Canal
LocationSB Exit 31 to NW 74th St.
RouteState Highway 821
CountyMiami-Dade County
StateFlorida
Coordinates25.84063, -80.38747
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 protection7 GoodSome minor problems.
Last inspectionApril 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 rating75.9 US tons
Inventory rating58.8 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 width34 ft (10.3 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2024)
Projected traffic6,940 by 2042
Trucks6%
Lanes on structure1
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 Sbhft R 31.1 over NW 74th ST Canal built?

It was built in 2008, making it 17 years old in 2025. It was reconstructed in 2023.

What condition is SR821 Sbhft R 31.1 over NW 74th 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 April 2024.

How much traffic does SR821 Sbhft R 31.1 over NW 74th ST Canal carry?

About 4,000 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SR821 Sbhft R 31.1 over NW 74th ST Canal?

The structure is 93 ft (28.3 m) long with a longest span of 93 ft (28.3 m) and a deck 34 ft wide.

Who owns SR821 Sbhft R 31.1 over NW 74th ST Canal?

It is owned by the State Toll Authority.