US Bridges

Causeway Blvd. over St. Joseph Sound (icww)

Fair

Pinellas County, Florida · 1.5MI W of Alt US 19 · Structure no. 150068

Built
1963
62 years old
Condition
Fair
inspected July 2023
Type
Movable - Bascule
Steel
Length
1,190 ft
1 main span
Daily traffic
9,300
2023 count
Owner
County
County Highway Agency

About this bridge

Causeway Blvd. over St. Joseph Sound (icww) is a steel movable - bascule carrying Causeway Blvd. over St. Joseph Sound (icww) in Pinellas County, Florida. It was built in 1963, so it is 62 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 9,300 vehicles a day, roughly 3% of them trucks, projected to reach 11,625 by 2042. The structure is 1,190 ft (362.8 m) long and 40 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCauseway Blvd.
CrossesSt. Joseph Sound (icww)
Location1.5MI W of Alt US 19
RouteCounty Highway 586
CountyPinellas County
StateFlorida
Coordinates28.05109, -82.79541
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating29.4 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+22 approach)
Design loadH 20
Structure length1,190 ft (362.8 m)
Longest span133 ft (40.5 m)
Deck width40 ft (12.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck17 ft (5.3 m)

Traffic and service

Average daily traffic9,300 (2023)
Projected traffic11,625 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Causeway Blvd. over St. Joseph Sound (icww) built?

It was built in 1963, making it 62 years old in 2025.

What condition is Causeway Blvd. over St. Joseph Sound (icww) 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 2023.

How much traffic does Causeway Blvd. over St. Joseph Sound (icww) carry?

About 9,300 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Causeway Blvd. over St. Joseph Sound (icww)?

The structure is 1,190 ft (362.8 m) long with a longest span of 133 ft (40.5 m) and a deck 40 ft wide.

Who owns Causeway Blvd. over St. Joseph Sound (icww)?

It is owned by the County Highway Agency.