Cozine Creek

With the headwaters of its main branch flowing down from the coastal foothills near S.W. Peavine Road, about five miles west of the city, Cozine Creek cuts through seven miles of forests, farm fields and urban development before joining the South Yamhill River near S.E. Dayton Avenue. Another 14 miles of named and unnamed tributaries enter the main branch from the north, south and west. 

Prior to European settlement in the Willamette Valley in the early to mid 1800s, the lands encompassing the more than 11-square-mile drainage area of Cozine Creek and its tributaries
were dominated by wide open expanses of grass prairies, edible wildflowers and scatterings of mature oak trees, with majestic boughs stretching out limbs to form umbrella-shaped crowns. And along the active floodplains, dense woodlands shaded the waters of Cozine Creek with stands of oak, ash, big leaf maple and cottonwood.
Cozine Creek has been a focus area for the Greater Yamhill Watershed Council (GYWC) since 1995.  As a result of historic and current land use practices, the biological, physical, chemical, and social characteristics of Cozine Creek have been altered and even degraded. State-funded water quality monitoring projects conducted by the Greater Yamhill Watershed Council (GYWC) have identified that Cozine Creek is water quality impaired by multiple pollutants, including stream temperatures that are too hot for fish, dissolved oxygen levels that are too low for general aquatic life, and summertime E. Coli concentrations that have exceeded limits for human recreational water contact. 

Yet despite these concerns, life can be surprisingly resilient in Cozine Creek. And if you look in the right places, you’ll be surprised to discover how much you may have been missing: beaver, fish, crawdads, blue heron, bald eagles, and even fields of flowering camas lilies and ancient oak trees.

We have an abundance of opportunities to improve the health and beauty of Cozine Creek. The time to care for Cozine is now. In the coming months, with funding and support from the City of McMinnville, Linfield College, and the Yamhill Soil & Water Conservation District, the GYWC will be conducting a number of outreach activities to help lift Cozine Creek back into our community awareness, including habitat project tours, social potlucks, weed control and native planting workshops, as well as opportunities for volunteering for trash cleanups and habitat restoration work parties.

The GYWC will also be reaching out to landowners and stakeholders to find those who are interested in weed control and native planting projects along their properties. Since 2002, the GYWC and our partners have secured more than $45,000 in state funding and local matching dollars for projects to enhance habitat along Cozine Creek. With the support of our community and Cozine Creek landowners, we are working to accelerate the pace of these efforts, and to meet our goal of securing another $45,000 for projects by June 2019.

To stay tuned on upcoming Cozine Creek outreach and volunteer opportunities, please sign up for our Friends of Cozine E-Newsletter  or contact us at

Or if you are an interested Cozine Creek landowner and would like to learn more about funding and partnership opportunities for controlling weeds and planting natives, please contact Luke Westphal at 503-474-1047 or


Friends of Cozine Creek

Subscribe to our Friends of Cozine E-Newsletter for updates on activities in the Cozine Creek area, including project tours, educational presentations and guest speakers, community potlucks, and opportunities to volunteer for habitat restoration and water quality monitoring projects.


Upcoming Cozine Creek Activities 

  • Presentation:  Improving Creekside Habitat, February 6th, 6pm- 7pm, @ McMinnville Library Carnegie Room

Water Quality Monitoring 

Pesticide Stewardship Partnership (PSP)

  • Statewide PSP Program Summary, 2013-2015 (PDF 1.6 Mb)
  • Yamhill PSP Program Summary, 2015, Updated in 2018 for Contact Info (PDF 0.8 Mb)
  • 2017, Cozine Monitoring Results are pending approval by the State. Check back here ~ March / April 2018.
  • 2016, Cozine Monitoring Results (Excel) (PDF)
  • 2015, Cozine Monitoring Results (Excel) (PDF)
  • 2014, Cozine Monitoring Results (Excel) (PDF)
  • 2013, Cozine Monitoring Results (Excel) (PDF)
  • 2012, Cozine Monitoring Results (Excel) (PDF) Pending Retrieval from State Database
  • 2011, Cozine Monitoring Results (Excel) (PDF) Pending Retrieval from State Database



Thanks to all of the students and community members who came out for our 10/14 Habitat Workshop and Weed Pull!