The Natural Resources Program is involved in a variety of projects ranging from stream and habitat restoration, and stormwater management, to park and natural area enhancements. The program works in collaboration with other city departments and outside organizations. Learn more about our partnerships.

Low Impact Development 

Low Impact DevelopmentLow impact development (LID) is a comprehensive approach to engineering design and stormwater management. LID aims to replicate the pre-development hydrologic regime of watersheds through infiltrating, filtering, storing, evaporating and detaining runoff close to its source. LID incorporates a strategic plan into development that mitigates our impact on the environment while maintaining a diverse habitat for the community and wildlife. 
Invasive Plant Control 

Invasive Plant Control1An invasive species is introduced to the region by an outside source (such as animals and humans). Not all non-native species are invasive; a species is invasive when it outcompetes native species through aggressive behavior. Invasive species can include plants, animals or insects. English Ivy and Nutria are examples. 

Invasive species can displace native species, and have the potential to significantly alter local ecosystems. Examples of invasive species that can be found in Wilsonville include: Himalayan blackberry, English ivy, nutria, and European starlings. 

Invasive Plant Control2Each year the City of Wilsonville hires a company that provides goats to browse areas that have been overgrown by invasive plant species. In Memorial Park, English Ivy is an aggressive opponent for the native plants. Goats have an especially strong digestive system that allows them to eat nearly any organic substance. The goats browse indiscriminately. This means that both the English Ivy and the good vegetation will also be eaten. After years of testing and monitoring, the city has observed the successful return of native species to the targeted areas. Follow up treatment such as hand pulling, spraying and cutting of invasive species compliment the work done by the goats. Returning to the same site ensures continued supression of invasive plants. 
Ice Age Tonquin Trail 

Ice Age Tonquin TrailThe City, Metro, and local governments are working in partnership with other agencies to develop a 12-mile regional non-motorized trail that would allow public access to the unique environmental landscape of the Tonquin Geological Area, approximately 17 square miles of land in Washington and Clackamas counties. This area has a unique landscape with extensive evidence of the Bretz Floods (or Missoula Floods) that scoured the Columbia River Gorge and extended into the Willamette Valley multiple times between approximately 13,000 and 15,000 years ago. Receding floodwaters from these events left behind unique geologic formations such as kolk ponds and channels, basalt hummocks and knolls, which are still present throughout the area today. 

The goal of this project is to protect these unique geologic features that provide valuable wildlife habitat and to build a regional trail. The trail would link the cities of Wilsonville, Sherwood and Tualatin and will also serve to connect the Willamette and Tualatin Rivers. 
Willamette River Water Trail 

Willamette River Water TrailThe City of Wilsonville is one of a number of Willamette River Water Trail partners dedicated to clean up and restore the Willamette River. Through this plan and the publication of the Willamette River Water Trail Guides it is the intent of the partners to improve access to the Willamette River, develop support facilities for river users such as parking, restrooms, waste disposal, and signage, and protect adjoining private lands. The plan includes the area from the headwaters east of Eugene to the mouth of the Willamette as it enters the Columbia. One of the key objectives is to get citizens on the water to understand the incredible role that the Willamette River plays in Oregon’s quality of life. 
Boeckman Road Wildlife Passage 

Boeckman Road Wildlife PassageThe City has implemented a 17-acre wetland mitigation project to offset the impact of the road construction on surrounding wetlands at the Boeckman Road extension. An integral part of the design of the roadway included wildlife passages created to reduce significantly the negative economic and environmental impacts and potential fatal human/wildlife encounters at Boeckman Road. The design of the road includes a bridge ranging from 5-8 feet tall and 400 feet in length, two 9’ X 4’ box culverts, five 24” and six 18” round concrete culverts as well as an amphibian wall and deer fence to prevent wildlife from entering the road surface. 

Boeckman Road Wildlife Passage2Leslie Bliss-Ketchum, a Portland State University graduate student, is working closely with City staff in conducting wildlife passage research by using cameras and a sand strip under the bridge to capture data on the effectiveness of the passages in reducing wildlife casualties and accidents. 

Hedgerow Planting and Maintenance 

Hedgerow Planting and MaintenanceOn December 15, 2007, the City joined the Xerces Society, Friends of Trees, and other volunteers in a hedgerow planting just south of the Wilsonville Community Garden. Approximately 1600 plants were used to establish the hedgerow including twelve varieties of shrubs and trees, and fifteen varieties of flowers. The purpose of the hedgerow is to provide foraging habitat for a diversity of pollinators such as bees, butterflies and a variety of other insects. The flowers selected for planting provide a range of shapes, colors, and flowering times and are all native to the Northwest. The hedgerow will also provide wildlife with cover for feeding, nesting and caring for young. The unique linear design of the hedgerow, sometimes referred to as a living fence, can provide travel lanes or corridors that allow wildlife to move safely across the landscape. 

Boeckman Creek 

Boeckman Creek 1This project included the removal of two culverts along a stretch of Boeckman Creek within Memorial Park. Once the culverts were removed, restoration of the stream was accomplished through the use of bioengineering techniques, a process that incorporates the use of biodegradable material such as matting to stabilize the stream banks and coir logs (the bundling of plant material in the shape of a log) to direct the flow of the stream. Live native plantings and “woody debris” such as downed trees, branches, and other plant material were added as part of the restoration process. 

Boeckman Creek 2The main objective of this project was to better facilitate the migration of fish such as the Chinook salmon, steelhead and Cutthroat trout that were observed in Boeckman Creek by the Oregon Department of Fish and Wildlife in a survey conducted prior to the start of the restoration. 

See the before & after project photos

Rivergreen Stormwater Outfall 

Rivergreen Stormwater OutfallThe Rivergreen Stormwater Outfall project involves improvements to an existing stormwater outfall located at the Rivergreen Homes subdivision, Willamette Way East off of Wilsonville Road. The combination of the surface runoff from the area and groundwater seepage was causing significant erosion of the river bank. The improvements involved constructing a bioswale and rerouting the stormwater discharges. It also involved bank stabilization treatments (bioengineering) to repair areas already significantly impacted by erosion as well as preventing further erosion.