About Us

Mission Statement

The Castle Group are marine structural engineers and contractors for operators of and consultants to entities in need of underwater inspection, design, and construction services. Our dual expertise of superior design/build services conveniently provides our customers with seamless, innovative, cost-effective solutions.

Our History

Founded by William J. Castle in 1983, W. J. Castle & Associates has been known for its marine engineering expertise. We employ Engineer-Divers who are proficient at underwater diagnostics and reporting, with the ability to develop repair designs as needed. Hydro-Marine, founded in 1997, is the construction division of The Castle Group and is staffed with highly trained, certified commercial divers (Association of Diving Contractors international / ADCI). Hydro-Marine is a certified Woman Business Enterprise (WBE) in multiple states. Simplified Bridge Systems was established in 2001, and since then two of our bridges have won awards from NJDOT for Quality and Initiative.

Services Overview

W. J. Castle & Associates

  • Structural / Marine Engineering
  • Construction Inspection & Management
  • Underwater Inspection Services
  • Specialty & Building Designs
  • Hydrographic / Fathometric Surveys
  • Non-Destructive Testing
  • Side Scan Sonar Imaging

Hydro-Marine Construction

  • Bulkhead and Pier Rehabilitation & Construction
  • Pile Jacketing & Repairs
  • Submarine Power Cable Recovery and Repair
  • Helical Anchor Installation
  • Underwater Construction & Repair
  • Underwater Debris Removal
  • Repairs to Marine Structures
  • Design / Build
  • Specialty

Simplified Bridge Systems

  • Design of Customized Bridges
  • Demolition of existing structures
  • Site preparation
  • Design & fabrication
  • Delivery & installation
  • New foundations (if required)
  • Finish roadway approaches