Isaiah David Hart Bridge
NBI Information
Location
State: Florida
County: Duval County
Feature Carried: SR-228
Feature Crossed: St. Johns River
Latitude, Longitude: 30.3156,-81.6275
Toll: On free road
Maintenance Responsibility: State Highway Agency
Structure Open, Posted, or Closed to Traffic: Open, no restriction
History
Year Built: 1967
Historical Significance: Bridge is possibly eligible for the National Register of Historic Places (requires further investigation before determination can be made) or bridge is on a State or local historic register.
Year Reconstructed: None
Picture Date: May 15, 2026
Geometry
Lanes on Structure: 4
Lanes under Structure: 2
Skew: 0 degrees
Number of Main Spans: 3
Main Structure Type: Truss - Thru
Main Structure Material: Steel Continuous
Number of Approach Spans: 14
Approach Structure Type: Stringer/Multi-beam or Girder
Approach Structure Material: Prestressed Concrete
Condition
Inspection Date: June 2023
Deck Condition: Fair
Superstructure Condition: Fair
Substructure Condition: Good
Channel Condition: Good
Culvert: Not Applicable
NBI Year: 2025
Bridge Information
The Isaiah David Hart Bridge, commonly referred to as the Hart Bridge, was completed in 1967. It is a cantilevered Warren through truss, with a main span of 1,088’, making it the third longest truss span in the world. It was built to relieve the traffic on the nearby John T. Alsop Jr. Bridge and John E. Mathews Bridge.
The bridge has traditionally been painted green and is referred to as “The Green Monster” and “The Green Giant” by locals. This bridge is a rather new example of a long span truss bridge and notably uses welded built-up beams and bolted connections. It lacks the rivets, v-lacing and lattice that is typically seen in larger truss bridges.
The bridge is named after Isaiah David Hart, who was the founder of Jacksonville.
References
Archaeological Consultants, Inc. “The Historic Highway Bridges of Florida.” Florida Department of Transportation, Dec. 2012, https://www.fdot.gov/docs/default-source/environment/pubs/Historic-Highway-Bridges-of-Florida-2010-Update.pdf. Accessed 27 Aug. 2026.
Davis, Ennis. “The Bridges of Downtown Jacksonville.” The Jaxson, 1 Sept. 2024, https://www.thejaxsonmag.com/article/the-bridges-of-downtown-jacksonville-page-2/. Accessed 27 Aug. 2026.
