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For over 40 years, RPA’s Airport Group has provided airport engineering services to more than 40 airports totaling well over 200 projects throughout the State of Montana.

Natural Resources

RPA’s Natural Resources Group provides a full range of science and engineering services including initial site investigations, environmental assessment, design and permitting, and site monitoring.

Site Development

RPA’s Site Development Group has extensive experience with providing a wide variety of land development services on commercial, residential, educational and recreational sites.


Our Structures Group has the expertise and unique experience to provide exceptional structural engineering for vertical designs. 

Streets & Highways

Our Streets & Highways Group provides clients with transportation engineering designs that are safe, environmentally conscious, context-sensitive, and aesthetically pleasing.


At RPA, our Surveying/SUE Group provides a full range of services including control surveys, topographic mapping, boundary/cadastral surveys, and Subsurface Utility Engineering (SUE) for all your needs.

Transportation Planning & Operations

Our Transportation Planning & Operations Group strives to anticipate trends in transportation and to develop safe, innovative, and practical solutions to transportation-related problems.

Water & Wastewater

RPA’s Water & Wastewater Group has been successful in assisting our clients with planning, project funding, design, and construction administration for various sized projects throughout Montana and the Northwestern United States.