US Bridges

NW 74 ST NB 31.0 over Snapper Creek Canal

Good

Miami-Dade County, Florida · NB Exit 31 to NW 74 St. · Structure no. 870908

Built
2009
16 years old, rebuilt 2023
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
321 ft
6 main spans
Daily traffic
6,400
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

NW 74 ST NB 31.0 over Snapper Creek Canal is a prestressed concrete stringer/multi-beam or girder carrying NW 74 ST NB 31.0 over Snapper Creek Canal in Miami-Dade County, Florida. It was built in 2009 and reconstructed in 2023, so it is 16 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 6,400 vehicles a day, roughly 6% of them trucks, projected to reach 11,104 by 2042. The structure is 321 ft (97.7 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNW 74 ST NB 31.0
CrossesSnapper Creek Canal
LocationNB Exit 31 to NW 74 St.
RouteState Highway 821
CountyMiami-Dade County
StateFlorida
Coordinates25.83908, -80.3865
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 alignment7: Better than present minimum criteria
Operating rating58.3 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHL 93
Structure length321 ft (97.7 m)
Longest span54 ft (16.5 m)
Deck width42 ft (12.8 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,400 (2024)
Projected traffic11,104 by 2042
Trucks6%
Lanes on structure2
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 NW 74 ST NB 31.0 over Snapper Creek Canal built?

It was built in 2009, making it 16 years old in 2025. It was reconstructed in 2023.

What condition is NW 74 ST NB 31.0 over Snapper Creek 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 NW 74 ST NB 31.0 over Snapper Creek Canal carry?

About 6,400 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is NW 74 ST NB 31.0 over Snapper Creek Canal?

The structure is 321 ft (97.7 m) long with a longest span of 54 ft (16.5 m) and a deck 42 ft wide.

Who owns NW 74 ST NB 31.0 over Snapper Creek Canal?

It is owned by the State Toll Authority.