US Bridges

NW 29th Avenue over Comfort Canal

Fair

Miami-Dade County, Florida · 180FT. N of NW 11th St. · Structure no. 876410

Built
1941
84 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
6,346
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

NW 29th Avenue over Comfort Canal is a concrete continuous slab carrying NW 29th Avenue over Comfort Canal in Miami-Dade County, Florida. It was built in 1941, so it is 84 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 6,346 vehicles a day, roughly 4% of them trucks, projected to reach 9,734 by 2042. The structure is 31 ft (9.3 m) long and 23 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesNW 29th Avenue
CrossesComfort Canal
Location180FT. N of NW 11th St.
RouteCity Street 0
CountyMiami-Dade County
StateFlorida
Coordinates25.78369, -80.24206
Functional classUrban Local

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.3 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length31 ft (9.3 m)
Longest span15 ft (4.7 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,346 (2020)
Projected traffic9,734 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NW 29th Avenue over Comfort Canal built?

It was built in 1941, making it 84 years old in 2025.

What condition is NW 29th Avenue over Comfort Canal 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 September 2024.

How much traffic does NW 29th Avenue over Comfort Canal carry?

About 6,346 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is NW 29th Avenue over Comfort Canal?

The structure is 31 ft (9.3 m) long with a longest span of 15 ft (4.7 m) and a deck 23 ft wide.

Who owns NW 29th Avenue over Comfort Canal?

It is owned by the City or Municipal Highway Agency.