US Bridges

NW 18th Avenue over Lawrence Canal

Fair

Miami-Dade County, Florida · 500FT. N of NW 7th St. · Structure no. 876409

Built
1940
85 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete
Length
30 ft
1 main span
Daily traffic
230
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

NW 18th Avenue over Lawrence Canal is a concrete tee beam carrying NW 18th Avenue over Lawrence Canal in Miami-Dade County, Florida. It was built in 1940, so it is 85 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 230 vehicles a day, roughly 1% of them trucks, projected to reach 390 by 2042. The structure is 30 ft (9.2 m) long and 28 ft wide.

Location

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CarriesNW 18th Avenue
CrossesLawrence Canal
Location500FT. N of NW 7th St.
RouteCity Street 0
CountyMiami-Dade County
StateFlorida
Coordinates25.78158, -80.22447
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
Deck8 Very GoodNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.4 US tons
Inventory rating35.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length30 ft (9.2 m)
Longest span30 ft (9.2 m)
Deck width28 ft (8.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2024)
Projected traffic390 by 2042
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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 18th Avenue over Lawrence Canal built?

It was built in 1940, making it 85 years old in 2025.

What condition is NW 18th Avenue over Lawrence 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 July 2024.

How much traffic does NW 18th Avenue over Lawrence Canal carry?

About 230 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is NW 18th Avenue over Lawrence Canal?

The structure is 30 ft (9.2 m) long with a longest span of 30 ft (9.2 m) and a deck 28 ft wide.

Who owns NW 18th Avenue over Lawrence Canal?

It is owned by the City or Municipal Highway Agency.