US Bridges

CR708 SE Bridge RD over Intracoastal Waterway

Fair

Martin County, Florida · 0.9 M E of US-1 on CR-708 · Structure no. 890107

Built
1985
40 years old
Condition
Fair
inspected October 2023
Type
Movable - Bascule
Steel
Length
383 ft
1 main span
Daily traffic
10,502
2023 count
Owner
County
County Highway Agency

About this bridge

CR708 SE Bridge RD over Intracoastal Waterway is a steel movable - bascule carrying CR708 SE Bridge RD over Intracoastal Waterway in Martin County, Florida. It was built in 1985, so it is 40 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 10,502 vehicles a day, roughly 2% of them trucks, projected to reach 18,221 by 2042. The structure is 383 ft (116.6 m) long and 45 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesCR708 SE Bridge RD
CrossesIntracoastal Waterway
Location0.9 M E of US-1 on CR-708
RouteCounty Highway 708
CountyMartin County
StateFlorida
Coordinates27.06467, -80.1223
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating62.4 US tons
Inventory rating37.4 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans1 (+4 approach)
Design loadHS 20
Structure length383 ft (116.6 m)
Longest span139 ft (42.3 m)
Deck width45 ft (13.6 m)
Roadway width33 ft (10 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic10,502 (2023)
Projected traffic18,221 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed16.2 mi (26 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 CR708 SE Bridge RD over Intracoastal Waterway built?

It was built in 1985, making it 40 years old in 2025.

What condition is CR708 SE Bridge RD over Intracoastal Waterway 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 October 2023.

How much traffic does CR708 SE Bridge RD over Intracoastal Waterway carry?

About 10,502 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is CR708 SE Bridge RD over Intracoastal Waterway?

The structure is 383 ft (116.6 m) long with a longest span of 139 ft (42.3 m) and a deck 45 ft wide.

Who owns CR708 SE Bridge RD over Intracoastal Waterway?

It is owned by the County Highway Agency.