Case Study - Lake Oswego, Oregon The Problem Lake Oswego is a 360 acre water body that provides all of the emenities of lakeside living for the high value real estate surrounding the water body. Access is limited to lake residents and a few properties with easements. The lakes residents enjoy swimming, water skiing and life on the water. These activities have been severely impacted in recent years with the arrival of two invasive aquatic weeds, Brazilian Elodea and Curly Leaf Pondweed. These weeds expanded rapidly and began to choke the shallow areas of the lake impacting boating and causing an eyesore. The association’s harvesting program would not keep up with the plants. Algae blooms also impacted water quality and detracted from the experience of living on the lake. The Solution Integration of Nutrient Reduction and Selective Herbicide Treatments to target these problems. Aquatechnex biologists developed and implemented a program to selectively target these invasive species. Our team has had a working relationship with the US Army Corps of Engineers Aquatic Plant Control Research Program since 1985 and have supported their field operations testing new detection systems, mechanical systems and herbicide application technologies to manage inasive species. We designed and implemented a treatment program using Sonar Precision Release herbicide early in the season to effectively control the invasive weeds. We also assisted the community in a number of nutrient reduction applications of Alum to reduce phosphorus and limit algae growth in bays of the lake. The community has developed a state of the art lake management program and team that continues to protect this important resource.