US Bridges

SR821 NB Heft 28.1 over NW 25 ST & N Line Canal

Good

Miami-Dade County, Florida · 1 Mile N of SR 836 Intchg · Structure no. 870418

Built
1973
52 years old, rebuilt 2023
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
243 ft
3 main spans
Daily traffic
136,400
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR821 NB Heft 28.1 over NW 25 ST & N Line Canal is a prestressed concrete stringer/multi-beam or girder carrying SR821 NB Heft 28.1 over NW 25 ST & N Line Canal in Miami-Dade County, Florida. It was built in 1973 and reconstructed in 2023, so it is 52 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 136,400 vehicles a day, roughly 10% of them trucks, projected to reach 211,600 by 2042. The structure is 243 ft (74.1 m) long and 126 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR821 NB Heft 28.1
CrossesNW 25 ST & N Line Canal
Location1 Mile N of SR 836 Intchg
RouteState Highway 821
CountyMiami-Dade County
StateFlorida
Coordinates25.79691, -80.38586
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.8 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length243 ft (74.1 m)
Longest span103 ft (31.4 m)
Deck width126 ft (38.5 m)
Roadway width124 ft (37.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic136,400 (2024)
Projected traffic211,600 by 2042
Trucks10%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR821 NB Heft 28.1 over NW 25 ST & N Line Canal built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2023.

What condition is SR821 NB Heft 28.1 over NW 25 ST & N Line 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 NB Heft 28.1 over NW 25 ST & N Line Canal carry?

About 136,400 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is SR821 NB Heft 28.1 over NW 25 ST & N Line Canal?

The structure is 243 ft (74.1 m) long with a longest span of 103 ft (31.4 m) and a deck 126 ft wide.

Who owns SR821 NB Heft 28.1 over NW 25 ST & N Line Canal?

It is owned by the State Toll Authority.