US Bridges

SR821 SB Heft 0.3 over US 1

Good

Miami-Dade County, Florida · At Exit 1 to US 1 · Structure no. 870191

Built
1974
51 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
267 ft
3 main spans
Daily traffic
17,500
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR821 SB Heft 0.3 over US 1 is a steel stringer/multi-beam or girder carrying SR821 SB Heft 0.3 over US 1 in Miami-Dade County, Florida. It was built in 1974, 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 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 17,500 vehicles a day, roughly 6% of them trucks, projected to reach 30,362 by 2042. The structure is 267 ft (81.4 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR821 SB Heft 0.3
CrossesUS 1
LocationAt Exit 1 to US 1
RouteState Highway 821
CountyMiami-Dade County
StateFlorida
Coordinates25.45378, -80.47515
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.9 US tons
Inventory rating43.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length267 ft (81.4 m)
Longest span164 ft (50 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,500 (2024)
Projected traffic30,362 by 2042
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$25,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR821 SB Heft 0.3 over US 1 built?

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

What condition is SR821 SB Heft 0.3 over US 1 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 February 2024.

How much traffic does SR821 SB Heft 0.3 over US 1 carry?

About 17,500 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SR821 SB Heft 0.3 over US 1?

The structure is 267 ft (81.4 m) long with a longest span of 164 ft (50 m) and a deck 35 ft wide.

Who owns SR821 SB Heft 0.3 over US 1?

It is owned by the State Toll Authority.