Professional Civil + Structural EngineeringDover, New Jersey · rjohnson@drjassoc.com
Independent engineering since 2006

Built for the hard parts.

Civil, structural, drainage, retaining-wall, and specialty engineering for projects where the easy detail stops working.

2006Firm established
Civil + StructuralOverlapping disciplines
Retaining WallsMajor specialty
Field-DrivenDesigns that can be built
What DRJ actually does

We are often called after somebody already knows what needs to happen.

Our job is to figure out how to make it work: resolve the controlling condition, make the geometry buildable, integrate the structure with the site, and produce documentation that moves the project forward.

Engineering is not just producing calculations.

It is understanding the real condition, the construction constraints, and the consequences of every decision.

Capabilities

Broad enough to see the whole problem.
Focused enough to solve it.

Retaining wall specialty

When the wall is not the easy part of the site.

DRJ is frequently brought in after the alignment, grading concept, or wall system already exists. The task is to turn that concept into a structurally sound, practical, constructible wall.

  • Large precast gravity systems
  • Segmental retaining walls
  • Reinforced soil systems
  • Tiered walls
  • Stream-adjacent walls
  • Rail-adjacent walls
  • Flood-related structures
  • Wall replacement + evaluation