Johnston Watershed Assessment - Stormwater Management Plan and Action Plan
Stormwater & Flood Control

Civil engineering, land surveying, and landscape architecture in Iowa
Nilles Associates, Inc. is an Iowa-based provider of civil engineering, land surveying, and landscape architecture services established in 1996 in Ankeny. Founded as a small land surveying practice, the organization has grown under the direction of John P. Nilles, PE & PLS into a key regional resource for municipal engineering, land development, stormwater design, and master planning. It serves a balanced portfolio of private and public clients, including municipalities, counties, state agencies, schools, developers, and homeowner associations, throughout the Des Moines metropolitan area and across Iowa, from project planning through design, contract administration, and construction.
John P. NillesOwner / Principal
Economical, sustainable, and constructable engineering solutions are developed to meet project goals, schedules, and budgets through close collaboration from planning through construction.
Accurate measurement and mapping support land development and construction projects, leveraging advanced tools to deliver clear and concise communication.
Designs for outdoor spaces range from large multi-purpose public facilities to smaller private planting projects, honoring the design vision and complementing civil engineering efforts.
Planning and site layout solutions lay the foundation for buildings, park amenities, trails, and roadways, supporting both public and private sectors.
Low-impact systems and current management products are applied across new construction and retrofit projects to address complex watershed demands.
Engineering options focus on the safe and efficient movement of pedestrians and vehicles, ensuring high standards from design through construction completion.
Collection, conveyance, treatment, and disposal systems are designed for applications ranging from simple on-site setups to large municipal facilities.
Clean water solutions address growing community demands through exploration, treatment, and distribution systems design.
Government · Land Development · Residential · Commercial · Industrial · Wastewater · Water Supply · Stormwater & Flood Control · Transportation · Highways & Roads · Parks & Open Space · Sports & Recreation · Public Safety · Education
Stormwater & Flood Control
Highways & Roads
Stormwater & Flood Control
Land Development