Bridge Design - The Tsiouvaras Simmons Holderness staff provides innovative and quality designs for highway bridges, pedestrian bridges, retaining walls and drainage structures.

Highway Design - Tsiouvaras Simmons Holderness Engineering has provided design for major freeway projects in Colorado, including mainline and interchange work.

Urban Multi-Modal Design - Design of multi-modal transportation facilities in constrained urban settings is a specialty of TSH Engineering.

Transportation Engineering - 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.

Water Resource Engineering - Tsiouvaras Simmons Holderness we offer complete services for Water Resources Engineering including planning, design and construction support for public and private clients.

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

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.