US Bridges

NW 22nd Avenue over Biscayne Canal C-8

Fair

Miami-Dade County, Florida · 0.2 Mile N of NW 151 ST · Structure no. 874030

Built
1964
61 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
112 ft
3 main spans
Daily traffic
17,200
2023 count
Owner
County
County Highway Agency

About this bridge

NW 22nd Avenue over Biscayne Canal C-8 is a prestressed concrete slab carrying NW 22nd Avenue over Biscayne Canal C-8 in Miami-Dade County, Florida. It was built in 1964, so it is 61 years old, older than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 17,200 vehicles a day, roughly 2% of them trucks, projected to reach 30,841 by 2042. The structure is 112 ft (34.1 m) long and 83 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNW 22nd Avenue
CrossesBiscayne Canal C-8
Location0.2 Mile N of NW 151 ST
RouteCounty Highway 0
CountyMiami-Dade County
StateFlorida
Coordinates25.9157, -80.23619
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.3 US tons
Inventory rating43.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span37 ft (11.4 m)
Deck width83 ft (25.3 m)
Roadway width73 ft (22.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,200 (2023)
Projected traffic30,841 by 2042
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
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 22nd Avenue over Biscayne Canal C-8 built?

It was built in 1964, making it 61 years old in 2025.

What condition is NW 22nd Avenue over Biscayne Canal C-8 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does NW 22nd Avenue over Biscayne Canal C-8 carry?

About 17,200 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is NW 22nd Avenue over Biscayne Canal C-8?

The structure is 112 ft (34.1 m) long with a longest span of 37 ft (11.4 m) and a deck 83 ft wide.

Who owns NW 22nd Avenue over Biscayne Canal C-8?

It is owned by the County Highway Agency.