Hart Bridge

Coordinates: 30°18′54″N 81°37′36″W / 30.315°N 81.6266°W / 30.315; -81.6266
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Isaiah D. Hart Bridge
The Hart Bridge from the south bank
Coordinates30°18′54″N 81°37′36″W / 30.315°N 81.6266°W / 30.315; -81.6266
US 1 Alt. / SR 228
(four general purpose lanes)
CrossesSt. Johns River
LocaleJacksonville, Florida
Official nameIsaiah David Hart Bridge
Maintained byFlorida Department of Transportation
ID number720107
DesignContinuous truss bridge
Total length1,171.7 metres (3,844 ft)
Width19.7 metres (65 ft)
Longest span331.6 metres (1,088 ft)
Clearance above6.14 metres (20.1 ft)
Clearance below42.9 metres (141 ft)
OpenedNovember 2, 1967 (1967-11-02)

The Isaiah David Hart Bridge is a truss bridge that spans the St. Johns River in Jacksonville, Florida. It carries U.S. Route 1 Alternate (US 1 Alt.) and State Road 228 (SR 228). It is named after Isaiah Hart, the founder of Jacksonville. It was designed by Sverdrup & Parcel.[1]


The Isaiah David Hart Bridge was completed in 1967 at a cost of $8.83 million. The official name of the bridge is the Isaiah David Hart Bridge after the founder of Jacksonville, Isaiah Hart. The bridge was built on a bond to be paid off with tolls until they were lifted in 1989. The bridge helped relieve congestion from the Mathews Bridge and the Main Street Bridge.[2] In 1999 the Hart Bridge was ranked 19th as one of the longest cantilever bridges in the world.[3]


Interior view of the Hart Bridge.

The bridge has traditionally been painted green and is often referred to as "The Green Monster" by locals.[4][5] Daily traffic averages 52,000 vehicles.[6] The stretch of highway between downtown and Beach Boulevard is known as the Commodore Point Expressway, but more commonly referred to by locals as the Hart Bridge Expressway.

The bridge is a steel cantilever bridge which is a type of continuous truss bridge. The bridge's main span is uncommon for a cantilever bridge in that the truss over the main channel tapers upward and the roadway below is suspended from the truss by steel hangers.


See also[edit]


  1. ^ Durkee, Jackson, "World's Longest Bridge Spans", National Steel Bridge Alliance, May 24, 1999
  2. ^ "Call Box: Hart Bridge has a distinctive history and a heady aroma". Jacksonville.com. Retrieved January 18, 2018.
  3. ^ "Seven Bridges: Hart Bridge". thecoastal.com. Retrieved January 18, 2018.
  4. ^ "SUNDAY MORNING RIVER RUNNER". Jacksonville.com. Archived from the original on August 12, 2011. Retrieved October 14, 2008.
  5. ^ Jax Air News Archived October 18, 2006, at the Wayback Machine
  6. ^ Strickland, Sandy. "Call Box: At 50, Hart has carried vehicles, runners and movie cameras". Jacksonville.com. Retrieved January 18, 2018.

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