Frequently Asked Questions About the Dunedin Causeway Bridges Project
Why do the existing bridges need to be replaced?
Both bridges were constructed in 1963 and do not meet current engineering standards for resisting damage from high waves during significant storms and vessel impact. Due to the narrow width of the bridges, both are considered “functionally obsolete”. The shoulders on the bridges are only 2 feet wide, and the sidewalks on the north side are only 3.5 feet wide. The multi-use path on the south side of the bridge is only six feet wide.
Current United States Coast Guard (USCG) navigational clearance guidelines for movable bridges at this location on the Gulf Intercoastal Waterway are 21 feet of vertical clearance in the closed position and unlimited clearance in the open position. The Main Bridge currently provides 20 feet of vertical clearance at the fenders in the closed position and unlimited navigational clearance in the open position. Ongoing maintenance and repair of the Main Bridge machinery also affects reliability and results in traffic delays. Replacement of both bridges is needed to keep the bridges open and the Main Bridge operating efficiently.
How wide will the new bridges be?
The Main and Tide Relief Bridges will be 62′-7″ wide and include two, 11-foot-wide travel lanes with 8-foot shoulders that can function as undesignated bicycle lanes. A 5-foot sidewalk is proposed on the north side of the bridge. A 15-foot-wide multi-use trail (as part of the Pinellas Trail spur) is proposed on the south side of the bridge. The new bridges will be approximately 22.5 feet wider than the existing bridges.
How much clearance will be provided for boats under the new bridges?
The vertical clearance under the new Main Bridge will be 35 feet above mean high water compared to 20 feet provided by the existing bridge.
The vertical clearance under the new Tide Relief Bridge will be 14.5 feet above mean high water compared to 12.5 provided by the existing bridge.
How will access be maintained to Honeymoon Island during construction?
Temporary bridges will be constructed prior to demolition of the existing bridges to provide access to the causeway and to Honeymoon Island.
Will recreational paddlers be able to cross beneath the bridge during construction?
The bridges will be closed to paddle craft during some phases of construction. Closure notification will be provided on this website.