US Bridges

SR77 over North Bay

Fair

Bay County, Florida · 1.1 Miles N. of SR390 · Structure no. 460089

Built
1998
27 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
3,575 ft
49 main spans
Daily traffic
29,000
2022 count
Owner
State
State Highway Agency

About this bridge

SR77 over North Bay is a prestressed concrete continuous stringer/multi-beam or girder carrying SR77 over North Bay in Bay County, Florida. It was built in 1998, so it is 27 years old, younger 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 6 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 29,000 vehicles a day, roughly 6% of them trucks, projected to reach 50,315 by 2044. The structure is 3,575 ft (1,089.8 m) long and 89 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesSR77
CrossesNorth Bay
Location1.1 Miles N. of SR390
RouteState Highway 77
CountyBay County
StateFlorida
Coordinates30.25836, -85.6469
Functional classUrban Other Principal 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.4 US tons
Inventory rating42.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans49
Design loadHS 20
Structure length3,575 ft (1,089.8 m)
Longest span90 ft (27.4 m)
Deck width89 ft (27.2 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,000 (2022)
Projected traffic50,315 by 2044
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed21.1 mi (34 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR77 over North Bay built?

It was built in 1998, making it 27 years old in 2025.

What condition is SR77 over North 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 December 2023.

How much traffic does SR77 over North Bay carry?

About 29,000 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is SR77 over North Bay?

The structure is 3,575 ft (1,089.8 m) long with a longest span of 90 ft (27.4 m) and a deck 89 ft wide.

Who owns SR77 over North Bay?

It is owned by the State Highway Agency.