When Hurricane Ian struck southwest Florida in September 2022, it destroyed the Sanibel Causeway, the only road link connecting Sanibel Island to the mainland. The rebuilding of the Sanibel Causeway after Hurricane Ian became one of the most significant emergency infrastructure projects in recent American history. Florida-based contractors Superior Construction and The de Moya Group, operating as a joint venture under a $328 million emergency phased design-build contract from the Florida Department of Transportation, completed both emergency stabilization and permanent reconstruction in a single continuous effort. Their work earned the Design-Build Institute of America Florida Region Award for Best Overall Project of the Year, the national DBIA Chairs Award, and the 2025 ENR Southeast Best Regional Project Award in the Highway/Bridge category. For building professionals examining post-disaster recovery methods, this project offers a master class in emergency infrastructure delivery.
The Emergency Design-Build Advantage for Post-Hurricane Reconstruction
The traditional design-bid-build approach to infrastructure reconstruction would have required separate contracts for damage assessment, emergency stabilization, final design, and permanent reconstruction. Each phase would proceed only after the previous one was fully complete, creating sequential delays that could extend project timelines by years. For a critical evacuation route serving a barrier island community, this timeline was unacceptable.
The emergency phased design-build contract used for the Sanibel Causeway eliminated this sequential bottleneck entirely. Under this model, the Superior-de Moya joint venture mobilized heavy equipment and began emergency repairs while final design details were still being completed. The design team worked alongside construction crews, adapting structural solutions to site conditions discovered during demolition and excavation. This concurrent engineering approach allowed the project to advance on multiple fronts simultaneously.
How Phased Design-Build Accelerates Emergency Infrastructure Recovery
The phased design-build model for emergency infrastructure recovery follows a structured framework that maximizes speed without sacrificing quality:
- Emergency assessment and immediate stabilization begins within days of the storm, using preliminary structural evaluations to identify critical failure points
- Permanent design development runs concurrent with emergency repairs, allowing engineering teams to verify field conditions before finalizing structural calculations
- Full reconstruction proceeds with no gap between temporary and permanent work, eliminating the waste and cost overruns associated with temporary stabilization followed by later demolition
- Final inspection and resilience certification verifies that the completed structure meets or exceeds pre-storm design standards for hurricane resistance
This approach eliminated the costly and time-consuming step of building temporary fixes only to remove them later. The joint venture sequenced material procurement, labor allocation, and equipment deployment as a single continuous operation. Design-build project delivery of this type requires contractors to maintain strong coordination between design teams and field crews, a capability that the Sanibel project team demonstrated throughout the reconstruction.
The FDOT investment of $328 million covered the full scope from emergency response through final completion, a cost structure that proved more efficient than the alternative of multiple separate emergency contracts followed by a permanent reconstruction contract years later. The project budget included accelerated material procurement, extended shift labor premiums, and the logistical costs of operating in a post-disaster environment with damaged local infrastructure.
Structural Systems and Coastal Resilience Features in the Rebuilt Causeway
The reconstructed Sanibel Causeway incorporates multiple layers of protective infrastructure designed to withstand Category 5 hurricane conditions. Each system addresses a specific failure mode identified during post-storm assessments of the original causeway.
Steel Sheet Pile Wall Systems
The project installed nearly 750,000 square feet (69,677 square meters) of steel sheet pile wall systems. These interlocking steel sections form a continuous barrier that protects the causeway substructure from wave action, scour, and storm surge. The sheet piles extend deep into the seabed, anchoring the structure against lateral forces generated by hurricane-driven water. PZ-22 and PZ-27 sections were specified for their high section modulus and proven performance in marine environments.
The sheet pile walls serve multiple functions simultaneously: they retain the approach embankments against wave erosion, they protect bridge pier foundations from scour, and they create a sealed barrier against storm surge infiltration beneath the roadway. Corrosion protection systems were applied to all exposed steel surfaces, with cathodic protection specified for submerged sections.
Armor Stone Placement and Scour Protection
Over 127,996 tons (116,116 tonnes) of armor stone surround the causeway foundations. This riprap system absorbs wave energy, prevents scour around bridge piers, and stabilizes the embankment sections where the causeway meets the shoreline. The stone gradation was specified to resist displacement under storm surge velocities associated with Category 5 hurricanes.
| Armor Stone Parameter | Specification |
|---|---|
| Total stone tonnage | 127,996 tons (116,116 tonnes) |
| Stone gradation | Heavy riprap, Class IV and V per ASTM D6092 |
| Placement zones | Bridge piers, abutments, approach embankments |
| Wave energy design basis | Category 5 hurricane surge conditions |
| Scour depth safety factor | 3:1 above maximum predicted scour depth |
| Stone material | Granite with minimum specific gravity of 2.6 |
The armor stone was placed using a combination of crane-operated positioning for critical zones and mechanical placement for bulk areas. Geotextile filter fabric beneath the stone layer prevents soil erosion while allowing groundwater drainage, a detail essential for long-term stability in tidal environments.
Elevated Seawalls and Drainage Infrastructure
The rebuilt causeway features elevated seawalls that raise the effective height of the structure above projected storm surge levels. These seawalls extend continuously along vulnerable approach sections, preventing wave overtopping that could erode the embankment from the landward side. The wall elevation was determined using updated Federal Emergency Management Agency coastal flood hazard data and state-specific storm surge modeling.
Advanced stormwater drainage systems capture and convey runoff through the structure without compromising embankment integrity. These systems were designed for the intense rainfall rates associated with major hurricane events, which can exceed 3 inches per hour for sustained periods. Heavy-duty high-density polyethylene pipe with hurricane-rated inlet structures ensures the drainage system remains functional even when debris-laden floodwaters flow across the roadway. Lessons from resilient waterfront development strategies informed several design decisions for the drainage and embankment protection systems.
Contractor Selection and Joint Venture Coordination for Disaster Recovery
The Superior Construction-de Moya Group joint venture structure offers a useful model for building professionals who may participate in disaster recovery projects. The selection process prioritized contractors with demonstrated experience in marine construction, emergency response protocols, and large-scale infrastructure delivery under compressed timelines.
Qualifying Criteria for Emergency Infrastructure Contractors
Agencies evaluating contractors for post-hurricane infrastructure work typically assess candidates against specific criteria that differ from standard project qualifications:
- Prior experience with phased emergency contracts of comparable scope and complexity
- Availability of specialized marine construction equipment, including barge-mounted cranes, pile driving rigs, and diver support vessels
- Workforce capacity for rapid mobilization and extended shift operations in austere conditions
- Safety record in high-risk post-disaster environments with compromised access and utilities
- Financial bonding capacity for projects exceeding $100 million in initial emergency phase alone
- Established relationships with material suppliers who can prioritize emergency orders
- Local knowledge of regional coastal conditions, permitting requirements, and environmental constraints
Joint Venture Structure and Risk Allocation
The joint venture pooled resources, equipment, and personnel from two established Florida contractors, each bringing complementary capabilities. Superior Construction contributed deep marine construction expertise gained from decades of Florida coastal projects. The de Moya Group brought extensive FDOT project experience and robust local supply chain relationships. This structure spread project risk across both organizations while ensuring redundant capacity for critical work streams.
The joint venture agreement specified clear roles for each partner: one firm led marine operations including pile driving and stone placement, while the other managed upland earthwork, drainage installation, and pavement reconstruction. Shared services such as project controls, quality assurance, and safety management were staffed jointly. This division of responsibility prevented duplication of effort while maintaining single-point accountability for each major work package.
Lessons for Building Professionals Working in Hurricane-Prone Regions
The Sanibel Causeway reconstruction offers practical insights that extend beyond large infrastructure projects to all types of construction in coastal and hurricane-prone zones. Building professionals working on anything from commercial buildings to residential developments can apply these lessons to improve project outcomes.
Designing for Post-Event Recovery
Buildings and infrastructure in coastal regions should be designed not only to survive hurricanes but also to facilitate rapid recovery afterward. Features that simplify post-storm assessments, enable temporary repairs, and allow phased permanent reconstruction add measurable long-term value. The causeway project demonstrated that investing in resilience features during initial reconstruction reduces overall lifecycle costs compared to repeated emergency repairs.
Key design considerations for post-event recovery include providing clear access points for inspection equipment, designing structural connections that can be rapidly evaluated and repaired, and specifying materials that are available from multiple suppliers to avoid procurement bottlenecks during demand surges after a disaster.
Material Specification for Coastal Resilience
The materials specified for the causeway reconstruction set benchmarks for coastal construction. Building professionals specifying materials for hurricane-prone regions should evaluate the following performance characteristics:
- Steel sheet piles: PZ-22 and PZ-27 sections with factory-applied corrosion protection and cathodic protection systems for submerged zones
- Armor stone: Granite and limestone riprap meeting ASTM D6092, with minimum specific gravity of 2.6 and soundness loss below 10 percent
- Structural concrete: High-performance mixes with corrosion inhibitors, minimum 28-day compressive strength of 5,000 psi for marine exposure
- Drainage systems: Heavy-duty HDPE meeting AASHTO M252 with hurricane-rated inlet structures tested for debris loading
- Seawall caps: Precast concrete with stainless steel connections and continuous waterstop at all joints
| Infrastructure Type | Key Resilience Feature | Applicable Design Standard | Post-Storm Inspection Protocol |
|---|---|---|---|
| Bridge foundations | Armor stone scour protection | AASHTO LRFD Bridge Design Specifications | Diver inspection after each major storm event |
| Approach embankments | Steel sheet pile containment walls | ASTM A328, AASHTO M202 | Annual visual survey plus post-storm bathymetric survey |
| Drainage infrastructure | Oversized HDPE with hurricane-rated inlets | State DOT drainage manual, FEMA coastal guidelines | Bi-annual inspection plus post-storm flow testing |
| Seawall and shoreline protection | Elevated crest elevation with scour apron | FEMA coastal construction manual, USACE coastal engineering standards | Annual structural inspection |
| Roadway pavement | Reinforced section with geotextile base stabilization | AASHTO pavement design guide, state DOT standards | Annual visual survey plus post-storm core sampling |
Documentation and Quality Assurance Under Accelerated Schedules
Even accelerated design-build projects require rigorous documentation. The Sanibel Causeway team maintained detailed records of material certifications, placement inspections, and as-built conditions despite the compressed schedule. This documentation supported both the quality assurance requirements of the FDOT contract and the project recognition process through DBIA and ENR. For building professionals working on emergency or accelerated projects, the causeway reconstruction demonstrates that documentation quality does not need to be sacrificed for speed when proper systems are established at project mobilization.
The DBIA Florida Region Award recognized not just the speed of the reconstruction but the quality of the completed work, the effectiveness of the contractor collaboration, and the long-term resilience of the infrastructure delivered. Similarly, large-scale transportation infrastructure projects across the country are adopting accelerated delivery methods that balance speed with quality assurance, a trend that the Sanibel Causeway project has helped advance.
As coastal communities face increasingly frequent and intense hurricane events, the Sanibel Causeway reconstruction will serve as a reference standard for how the construction industry approaches post-disaster recovery. The combination of emergency design-build delivery, multi-layer resilience engineering, and effective joint venture coordination provides a template that can be adapted for infrastructure projects, commercial buildings, and residential developments in hurricane-prone regions nationwide.