Hopper Dennis Jellison, PLLC (HDJ) has been providing professional engineering services to the communities of the Northwest for a quarter century. Since its inception in 1980, Hopper Dennis Jellison has been committed to helping build stronger communities by providing outstanding service to both private and public sector clients. HDJ also recognizes the impact they have on the community through the accomplishments and involvement of their employees. HDJ strives to create a working environment that allows their valued staff of 67 people to achieve both their personal and professional goals.

Hopper Dennis Jellison, is a consulting firm that provides Civil Engineering, Traffic Engineering, Land Use Planning, Landscape Architecture, Project Management and Construction Services. HDJ operates out of their main office in Vancouver, Washington with a branch office in Tigard, Oregon and another in Pasco, Washington. HDJ is licensed and actively performing work on projects throughout Washington, Oregon, Montana, Minnesota, Utah and Hawaii. HDJ has an outstanding reputation for delivering the highest quality product. Their reputation is based on their depth and range of experience, problem-solving and communication skills, responsiveness, and integrity. With over 2,500 projects completed or in progress, HDJ has the knowledge, skill, and resources to meet the demands of tomorrow’s public and private sector developments.