About _us_

About us

CHS Engineers, LLC is a civil engineering and land surveying professional services firm located in Bellevue, Washington, offering a full range of consulting, planning, design and construction management services to municipalities and private property owners. CHS is committed to determining the needs of each client through the identification of innovative, economically feasible and environmentally responsible solutions. To support these capabilities, CHS employs professionals experienced in developing and implementing practical solutions to complex engineering problems.
CHS has contributed to civil engineering, land surveying and construction projects throughout western Washington, primarily for water, wastewater and storm water infrastructure.

Since 1993, CHS has completed hundreds of projects for both public and private clients. We provide a full spectrum of services for wastewater collection and treatment systems, pump, lift and booster stations, water transmission, distribution and treatment systems, reservoirs, storm water drainage/retention, roadway design, site surveys, boundary line adjustments, easement acquisition and other related work.

CHS has led the design, survey and construction management of multi-million dollar projects and our efforts have been instrumental in bringing projects to completion, on-time and on-budget. CHS clients include cities, towns, special-purpose districts, private water purveyors, and land development companies. In addition to the breadth of expertise in-house, CHS has established successful relationships with other local consultants (environmental, financial, electrical, structural, geotechnical, odor control, etc.) and can assemble a complete team of professionals to comprehensively address our clients’ needs and project challenges.


Company history

CHS Engineers was founded in 1992 by Scott Christensen, Tim Harrigan and Andy Soulé, all professional civil engineers with extensive experience serving cities, towns and special-purpose districts in western Washington.  Starting with a staff of seven in January 1993, CHS has grown to a team of 14 engineers, surveyors, inspectors, technicians and administrative staff. We continue to serve most of the same clients that we started with in 1993, and have added numerous public and private entities to our list of satisfied customers.  Andy retired in 2001. Tim’s retirement in 2004 coincided with bringing Rodney Langer and Evan Henke on as Principals with Scott Christensen. Together the three working owners of CHS offer over 85 years of experience to respond to the challenges facing our municipal and private clients.


  • Scott Christensen, P.E.

    Scott Christensen, P.E.Principal

    scottc@chsengineers.com  |  Scott is a native Washingtonian and is a graduate of Fife High School, Green River College, and the University of Washington (Go Huskies!). In high school, Scott enjoyed lettering in football and wrestling and working on cars. Scott joined the US Navy Seabees and served more than two years during the Vietnam War. Scott has worked as a consulting engineer his entire career. Scott and his partners formed CHS Engineers in 1992. Scott has managed, planned, designed, and provided construction engineering services for municipal clients in water, storm water and wastewater projects, including wastewater treatment plants, pump stations and trenchless technologies. Scott has been involved in a number of special assignments including rate and connection charge studies, wholesale utility contract negotiations, mediation, assumption strategies, excise tax models, GIS implementation and a wide range of public presentations. Scott and his wife Diane enjoy their children and all their related activities including church, music, sports and Scott’s 1988 Mustang and 1966 K-model Mustang. Scott is a bracket drag racer at Pacific and Bremerton race tracks in his spare time.

  • Rodney Langer, P.E.

    Rodney Langer, P.E.Principal

    rodneyl@chsengineers.com  |  Rodney was born in Spokane and then lived in Seattle until the late 1960s before the Boeing decline led the family to move to the Southwest. He was raised in Tucson, AZ, and was active and held leadership positions in his church youth group and Boy Scouts, including achieving the rank of Eagle Scout. Rodney completed his education with a Bachelor of Science in Civil Engineering (University of Arizona – Go Wildcats!). While in school Rodney worked as a draftsman for a local civil engineering firm. Moving back to Washington in 1992, Rodney went to work for Scott Christensen and was one of the first employees at CHS. Rodney’s professional experience of over 25 years and 30 years in consulting services includes both new and rehabilitation work for municipal water and sewer systems. Specific areas of focus including planning, project management and lift or pump station rehabilitation. In 2002 Rodney earned a Graduate Certificate in Project Management. Rodney and his wife Karen have two children making the transition from college to work. When not at the office, Rodney tries to keep up with his wife Karen while running, helping out at church, enjoying time with friends and wondering if he will ever get working on that project taking up space in the garage – a weathered yellow 1970 Beetle.

  • Evan Henke, P.E.

    Evan Henke, P.E.Principal

    evanh@chsengineers.com  |  Evan was born and raised in Missoula, Montana where he was actively involved in 4-H and snow skiing. After high school, he moved to Phoenix, AZ, where he obtained his Bachelor of Science in Civil Engineering from Arizona State University (Go Sun Devils!). During college, Evan served as Treasurer, V.P. and President of the ASCE Student Chapter and he designed and constructed a concrete canoe for competition with other ASCE chapters. While attending college, he worked for the Army Corps of Engineers performing construction inspection and materials lab analysis. While in Arizona, Evan found time to get his SCUBA certification, and to enjoy tubing trips down the Salt River (once in said concrete canoe). Evan moved to Washington and joined CHS in early 1993, where he has worked on numerous municipal projects and several development projects, ranging from wastewater treatment plant expansion to a pile-supported public boardwalk. He has accumulated several miles of water/sewer/storm main design experience and right of way improvements. His pragmatic approach is also utilized in utility comprehensive planning and financial evaluations. Evan and his wife have four adult sons, a handful of grandchildren, and one large dog. Evan enjoys wood shop projects, motorcycles and frequently commutes to work on a Honda CTX700ND.