US Bridges

Hernando Drive over Clam Bay

Fair

Collier County, Florida · 0.2 MI W/O Kendall DR · Structure no. 034118

Built
1972
53 years old
Condition
Fair
inspected January 2025
Type
Slab
Prestressed Concrete
Length
107 ft
3 main spans
Daily traffic
1,250
2025 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hernando Drive over Clam Bay is a prestressed concrete slab carrying Hernando Drive over Clam Bay in Collier County, Florida. It was built in 1972, so it is 53 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 1,250 vehicles a day, roughly 3% of them trucks, projected to reach 3,193 by 2045. The structure is 107 ft (32.5 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesHernando Drive
CrossesClam Bay
Location0.2 MI W/O Kendall DR
RouteCity Street 0
CountyCollier County
StateFlorida
Coordinates25.95051, -81.74171
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 protection7 GoodSome minor problems.
Last inspectionJanuary 2025
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.6 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length107 ft (32.5 m)
Longest span36 ft (10.9 m)
Deck width36 ft (10.9 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,250 (2025)
Projected traffic3,193 by 2045
Trucks3%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Hernando Drive over Clam Bay built?

It was built in 1972, making it 53 years old in 2025.

What condition is Hernando Drive over Clam Bay 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 January 2025.

How much traffic does Hernando Drive over Clam Bay carry?

About 1,250 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Hernando Drive over Clam Bay?

The structure is 107 ft (32.5 m) long with a longest span of 36 ft (10.9 m) and a deck 36 ft wide.

Who owns Hernando Drive over Clam Bay?

It is owned by the City or Municipal Highway Agency.