US Bridges

SR821 Heft NB 17.8 over SR 874 & Scl RR

Good

Miami-Dade County, Florida · 0.5 Mile S of SW 120 ST · Structure no. 870407

Built
1973
52 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
524 ft
5 main spans
Daily traffic
110,200
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR821 Heft NB 17.8 over SR 874 & Scl RR is a steel stringer/multi-beam or girder carrying SR821 Heft NB 17.8 over SR 874 & Scl RR in Miami-Dade County, Florida. It was built in 1973, 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 110,200 vehicles a day, roughly 6% of them trucks, projected to reach 191,197 by 2042. The structure is 524 ft (159.7 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR821 Heft NB 17.8
CrossesSR 874 & Scl RR
Location0.5 Mile S of SW 120 ST
RouteState Highway 821
CountyMiami-Dade County
StateFlorida
Coordinates25.65025, -80.38475
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.
Last inspectionMarch 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 alignment7: Better than present minimum criteria
Operating rating91.1 US tons
Inventory rating54.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length524 ft (159.7 m)
Longest span131 ft (40 m)
Deck width55 ft (16.9 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deck25 ft (7.6 m)

Traffic and service

Average daily traffic110,200 (2024)
Projected traffic191,197 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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$160,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR821 Heft NB 17.8 over SR 874 & Scl RR built?

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

What condition is SR821 Heft NB 17.8 over SR 874 & Scl RR 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 Heft NB 17.8 over SR 874 & Scl RR carry?

About 110,200 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SR821 Heft NB 17.8 over SR 874 & Scl RR?

The structure is 524 ft (159.7 m) long with a longest span of 131 ft (40 m) and a deck 55 ft wide.

Who owns SR821 Heft NB 17.8 over SR 874 & Scl RR?

It is owned by the State Toll Authority.