Princess Island House Bridge
Single-Span Bridge Replacement
Decorative Brick-Paved Bridge with Timber Railing | FDOT/AASHTO Compliant Design
Client: Flagler County / FDOT District 5
Location: Flagler County, FL
Services: Bridge Design | Roadway Design | Drainage Design | Permitting | Post Design Services During Construction
This single-span bridge project combines structural performance with aesthetic detail, featuring a brick paver wearing surface and timber railing designed to meet modern safety standards while preserving a classic, traditional look.
PROJECT OVERVIEW
The Princess Island House Bridge replacement delivers a compact, single-span crossing engineered for safety and built to last. The structure pairs prestressed slab unit construction with a fiber-reinforced concrete topping for long-term durability, while a timber railing system — engineered to TL-2 standards — provides reliable traffic protection appropriate for the roadway's lower-speed setting. A bonded brick paver wearing surface in a mortar bed gives the bridge a refined, residential-community aesthetic that fits its setting, while fully complying with FDOT and AASHTO design standards.
Project Highlights & Key Outcomes
Single-span structure with an overall length of 30'-0" and a coping-to-coping width of 18'-0"
15'-0" clear roadway width, including one 12'-0" travel lane and 1'-6" shoulders on each side
42" timber railing meeting TL-2 Test Level Performance Criteria, suited for local roads with posted speed limits under 45 mph
Railing and deck designed in accordance with Section 4.2 of the FDOT Structures Design Guidelines and Chapter 13 of the AASHTO LRFD Guide Specifications
Superstructure built with 12"x48" and 12"x60" prestressed slab units, topped with a 6" cast-in-place fiber-reinforced concrete topping, per FDOT Developmental Design Standards D20350, D20353, and D20355
Wearing surface finished with bonded brick pavers set in a mortar bed for a distinctive, durable surface
