Stahly Engineering & Associates is a full-service civil engineering and survey firm based in Helena, Montana with additional ... offices in Bozeman and Billings. Emphasizing the construction of positive and lasting professional relationships, Stahly Engineering & Associates delivers high-quality service rooted in experience and integrity. Our firm provides engineering services in the fields of transportation, site development, water/ wastewater systems, and structures; we also assist public and private clients with planning, grant-writing/ administration, GIS, survey services, and construction inspection. read more