US Bridges

US-1 (SR-5) SB over St. Lucie River / SR-707

Fair

Martin County, Florida · 1 Mile South of SR-707 · Structure no. 890151

Built
1997
28 years old
Condition
Fair
inspected June 2024
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
4,487 ft
21 main spans
Daily traffic
29,148
2022 count
Owner
State
State Highway Agency

About this bridge

US-1 (SR-5) SB over St. Lucie River / SR-707 is a prestressed concrete continuous segmental box girder carrying US-1 (SR-5) SB over St. Lucie River / SR-707 in Martin County, Florida. It was built in 1997, so it is 28 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 29,148 vehicles a day, roughly 5% of them trucks, projected to reach 50,572 by 2044. The structure is 4,487 ft (1,367.6 m) long and 61 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS-1 (SR-5) SB
CrossesSt. Lucie River / SR-707
Location1 Mile South of SR-707
RouteU.S. Route 1
CountyMartin County
StateFlorida
Coordinates27.205, -80.25877
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.8 US tons
Inventory rating21.9 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans21
Design loadHS 20 + Mod
Structure length4,487 ft (1,367.6 m)
Longest span260 ft (79.2 m)
Deck width61 ft (18.6 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,148 (2022)
Projected traffic50,572 by 2044
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
Detour if closed1.2 mi (2 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 US-1 (SR-5) SB over St. Lucie River / SR-707 built?

It was built in 1997, making it 28 years old in 2025.

What condition is US-1 (SR-5) SB over St. Lucie River / SR-707 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 June 2024.

How much traffic does US-1 (SR-5) SB over St. Lucie River / SR-707 carry?

About 29,148 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is US-1 (SR-5) SB over St. Lucie River / SR-707?

The structure is 4,487 ft (1,367.6 m) long with a longest span of 260 ft (79.2 m) and a deck 61 ft wide.

Who owns US-1 (SR-5) SB over St. Lucie River / SR-707?

It is owned by the State Highway Agency.