Water Resource Engineering - Tsiouvaras Simmons Holderness offers complete services for water resources engineering including planning, design and construction support for public and private clients.

Highway/Interchange Design - Tsiouvaras Simmons Holderness provides the full range of highway and interchange engineering expertise on major freeway projects in Colorado.

Construction Administration and Inspection - Tsiouvaras Simmons Holderness provides the full range of construction services including project management, contract administration, and field observation.

Urban Streets- Tsiouvaras Simmons Holderness provides complete urban multi-modal transportation design solutions.

Design-Build Projects - Tsiouvaras Simmons Holderness provides the full range of design-build services including design and construction services which include project management, design, construction quality assurance, and field observation.

Traffic Engineering and Transportation Planning - Tsiouvaras Simmons Holderness provides transportation planning and analysis to help agencies shape the needs of their projects, including studies, intersection designs, and corridor and access planning.

CMGC - Tsiouvaras Simmons Holderness has been a leader in the CMGC delivery method, including CDOT’s first highway CMGC project at I-70/Dotsero Interchange.

Owner Representative – Design-Build - Tsiouvaras Simmons Holderness provides the full range of Owner Representative services for design-build projects. We have the experience to take a project from preliminary design, through procurement and construction.