US Bridges

CR-76A over ST Lucie Canal

Good

Martin County, Florida · 1.5 Mile West of SR-76 · Structure no. 890093

Built
1980
45 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
723 ft
7 main spans
Daily traffic
3,100
2023 count
Owner
County
County Highway Agency

About this bridge

CR-76A over ST Lucie Canal is a prestressed concrete stringer/multi-beam or girder carrying CR-76A over ST Lucie Canal in Martin County, Florida. It was built in 1980, so it is 45 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,100 vehicles a day, roughly 20% of them trucks, projected to reach 5,379 by 2042. The structure is 723 ft (220.4 m) long and 42 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesCR-76A
CrossesST Lucie Canal
Location1.5 Mile West of SR-76
RouteCounty Highway 76A
CountyMartin County
StateFlorida
Coordinates27.08801, -80.30196
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54.7 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length723 ft (220.4 m)
Longest span135 ft (41.1 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2023)
Projected traffic5,379 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 CR-76A over ST Lucie Canal built?

It was built in 1980, making it 45 years old in 2025.

What condition is CR-76A over ST Lucie Canal 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 CR-76A over ST Lucie Canal carry?

About 3,100 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is CR-76A over ST Lucie Canal?

The structure is 723 ft (220.4 m) long with a longest span of 135 ft (41.1 m) and a deck 42 ft wide.

Who owns CR-76A over ST Lucie Canal?

It is owned by the County Highway Agency.