US Bridges

SR 687/4th Street over Big Island Gap

Good

Pinellas County, Florida · 0.25MI S of I-275 · Structure no. 150309

Built
2023
2 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
263 ft
3 main spans
Daily traffic
11,900
2023 count
Owner
State
State Highway Agency

About this bridge

SR 687/4th Street over Big Island Gap is a prestressed concrete stringer/multi-beam or girder carrying SR 687/4th Street over Big Island Gap in Pinellas County, Florida. It was built in 2023, so it is 2 years old, younger than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,900 vehicles a day, roughly 6% of them trucks, projected to reach 20,646 by 2042. The structure is 263 ft (80.2 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 687/4th Street
CrossesBig Island Gap
Location0.25MI S of I-275
RouteState Highway 687
CountyPinellas County
StateFlorida
Coordinates27.89556, -82.63881
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length263 ft (80.2 m)
Longest span88 ft (26.7 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,900 (2023)
Projected traffic20,646 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SR 687/4th Street over Big Island Gap built?

It was built in 2023, making it 2 years old in 2025.

What condition is SR 687/4th Street over Big Island Gap in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does SR 687/4th Street over Big Island Gap carry?

About 11,900 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 687/4th Street over Big Island Gap?

The structure is 263 ft (80.2 m) long with a longest span of 88 ft (26.7 m) and a deck 43 ft wide.

Who owns SR 687/4th Street over Big Island Gap?

It is owned by the State Highway Agency.