US Bridges

18th Avenue SW over Green Canal

FairPosted for load

Collier County, Florida · 0.2MI W of CR-951 · Structure no. 034108

Built
1968
57 years old
Condition
Fair
inspected March 2024
Type
Slab
Prestressed Concrete
Length
92 ft
3 main spans
Daily traffic
938
2024 count
Owner
County
County Highway Agency

About this bridge

18th Avenue SW over Green Canal is a prestressed concrete slab carrying 18th Avenue SW over Green Canal in Collier County, Florida. It was built in 1968, so it is 57 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. Its operating status is: posted for load restriction.

It carries about 938 vehicles a day, roughly 1% of them trucks, projected to reach 1,173 by 2042. The structure is 92 ft (28 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries18th Avenue SW
CrossesGreen Canal
Location0.2MI W of CR-951
RouteCounty Highway 0
CountyCollier County
StateFlorida
Coordinates26.19578, -81.69014
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length92 ft (28 m)
Longest span31 ft (9.4 m)
Deck width30 ft (9.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic938 (2024)
Projected traffic1,173 by 2042
Trucks1%
Lanes on structure2
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 18th Avenue SW over Green Canal built?

It was built in 1968, making it 57 years old in 2025.

What condition is 18th Avenue SW over Green 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 March 2024.

How much traffic does 18th Avenue SW over Green Canal carry?

About 938 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is 18th Avenue SW over Green Canal?

The structure is 92 ft (28 m) long with a longest span of 31 ft (9.4 m) and a deck 30 ft wide.

Who owns 18th Avenue SW over Green Canal?

It is owned by the County Highway Agency.