Hart Bridge -- Traffic count average daily: 47,000

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Ranked #338 in Local, #31,684 overall

Officially named the Isaiah David Hart Bridge, after the found of Jacksonville, Florida; it's a cantilever bridge over the St. Johns River.

The Hart Bridge in Jacksonville, Florida is the major bridge we travel when crossing the St. Johns River for Jacksonville Jaguars games. It drops us at the stadium a short distance from our tailgating parking lot. Other traffic usually arrives into downtown for the game via either the Mathews Bridge or the Main Street Bridge.

What many people may not know is that the Hart Bridge was named after Isaiah David Hart, was a Georgia plantation owner, who is credited with being the founder of Jacksonville, Florida! His son, Ossian B. Hart, became the tenth governor of Florida in 1873.

Traffic count average daily: 47,000 


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Hart Bridge Traffic Signs

Hart Bridge at a glance 



The Isaiah David Hart Bridge is a cantilever bridge that spans the St. Johns River in Jacksonville, Florida. It is named after Isaiah Hart, the founder of Jacksonville. The bridge has traditionally been painted green and is often referred to as "The Green Monster" by locals.Florida Times UnionJax Air News The westbound end of the bridge delivers drivers to downtown Jacksonville or Martin Luther King Expressway, while the eastbound end sends motorists to Beach Boulevard. Daily traffic is 47,000 vehicles. The stretch of highway between downtown and Beach Blvd. is known as the Hart Bridge Expressway.

Hart Bridge Factoids 

Official name: Isaiah David Hart Bridge
Carries: four general purpose lanes
Crosses: St. Johns River
Locale: Jacksonville, Florida
Maintained by: Florida Department of Transportation
ID number: 720107
Design: continuous steel through truss bridge
Longest span: 331.6 meters (1088 feet)
Total length: 1171.7 meters (3844 feet)
Width: 19.7 meters (65 feet)
Vertical clearance: 6.14 meters (20.1 feet)
Clearance below: 42.9 meters (141 feet)
Opening date: 1967

Namesake: Isaiah Hart

Isaiah David Hart (Nov. 6, 1792 - 1861) was a Georgia plantation owner and the founder of Jacksonville, Florida!!!

Isaiah Hart at a glance 

Isaiah David Hart (November 6, 1792 ? 1861) was an American plantation owner and the founder of Jacksonville, Florida. Originally from Georgia, he began setting out the plans for the town in 1822 after moving to the area named Cowford. The Isaiah D. Hart Bridge over the St. Johns River in Jacksonville is named after him.

His son, Ossian B. Hart, became the tenth governor of Florida in 1873.

Some interesting books on Jacksonville 

Historic Photos of Jacksonville

Amazon Price: $32.54 (as of 07/12/2009) Buy Now

Jacksonville's Architectural Heritage (Jacksonville Historic Landmarks Comm)

Amazon Price: $37.96 (as of 07/12/2009) Buy Now

Jacksonville Revisited (FL) (Postcard History Series)

Amazon Price: $15.59 (as of 07/12/2009) Buy Now

It's a cantilever bridge

The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over 1500 ft., and can be more easily constructed at difficult crossings by virtue of using little or no falsework.

Hart Bridge Eastbound

Cantilever bridge at a glance 

A cantilever bridge is a bridge built using cantilevers, structures that project horizontally into space, supported on only one end. For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete. The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over , and can be more easily constructed at difficult crossings by virtue of using little or no falsework.

It crosses the St. Johns River

The Hart Bridge spans nearly 1 mile over the St. Johns River in Jacksonville, Florida.

St. Johns River at a glance 

The St. Johns River (officially Saint Johns River, but commonly spelled 'St. Johns River') is the longest river in the U.S. state of Florida, stretching 310 miles (500 km) from Indian River County to the Atlantic Ocean in Jacksonville in Duval County. The Saint Johns is north-flowing, which is somewhat unusual among U.S. rivers

The elevation change from headwaters to mouth is only about 30 feet, making the St. Johns one of the worlds "laziest" rivers. Extremely low velocity and low volume of flow, combined with the generally level elevation, cause the St. Johns to spread out to a great width for much of its course. During periods of low flow, the river can be influenced by tides as far south as Lake Monroe - 161 miles inland. For a distance of over twenty miles before arriving at downtown Jacksonville, the river's average width exceeds two miles and some points exceed three miles in width. The slow flow of the St. Johns makes it difficult for pollutants to be flushed from the waters, which has become a serious problem for the river ecosystem. It was designated as one of the American Heritage Rivers in 1997 and pegged by an environmental organization as the 6th Most Endangered River in America in 2008.http://www.ens-newswire.com/ens/apr2008/2008-04-17-01.asp Still, the river is home to numerous species of plants and animals. It is not uncommon to see dolphins in the river east of Jacksonville and manatees in the springtime when the water warms up. Alligators, bald eagles, ospreys, stingrays, and many species of fish?both salt and fresh water?are found living in the river and on its banks. The entire basin is managed by the St. Johns Water Management District.

Some interesting books on the St. Johns River 

River of Lakes: A Journey on Florida's St. Johns River

Amazon Price: $13.57 (as of 07/12/2009) Buy Now

St. Johns River Guidebook

Amazon Price: (as of 07/12/2009) Buy Now

St. Johns & Ocklawaha Rivers (Images of America: Florida)

Amazon Price: $18.99 (as of 07/12/2009) Buy Now

A Cruising Guide to the Bay of Fundy and the St. John River

Amazon Price: (as of 07/12/2009) Buy Now

Saving the St. Johns River: One person made a difference

Amazon Price: $14.95 (as of 07/12/2009) Buy Now

Chopper 2 Sky Tour: St. Johns River 

Chopper 2 Sky Tour: St. Johns River

Chopper 2 pilot Dan McCarthy provided viewers with a unique view of a natural wonder in Central Florida on Tuesday. A helicopter can provide some amazing pictures of many things, and the St. Johns River is just one of them.

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The buzz on the Hart Bridge 

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Are you a fan of the Hart Bridge? Travel it much? Did you know about Isaiah Hart--that he was the founder of Jacksonville?

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