OLWC Ash & Oak Tree Health Workshop Series
Join the Oswego Lake Watershed Council for a free Ash and Oak Workshop Series focused on protecting our urban forest and preparing for invasive tree pests. Funded by the City of Lake Oswego Municipal Grant Program, these workshops support implementation of the City’s Urban and Community Forestry Plan and help strengthen community resilience to climate impacts.
Participants will learn how to identify signs and symptoms of invasive beetles such as the emerald ash borer and Mediterranean oak borer, which can cause severe damage to trees. The workshop will also introduce opportunities to participate as community scientists helping collect local tree inventory data. The session will include presentations from experts, including ISA Certified Arborist Brian French.
Location: Friends of Tryon Creek Education Pavilion, 11321 SW Terwilliger Blvd, Portland
Saturday, April 18, 2026 | 9:30 AM – 12:30 PM

Oak Tree Workshop
Location: Mountain Park HOA, 2 Mt. Jefferson Terrace, Lake Oswego
Tuesday, April 21 | 9:00 AM – 12:00 PM

Registration is required. Participants may register for one or both workshops. Additional event details will be shared with registrants in advance. Learn more and register here
OLWC Watershed Restoration Tours
Join the Oswego Lake Watershed Council for a series of Watershed Restoration Tours exploring how local restoration projects are strengthening watershed health and community climate resilience. Each guided tour highlights restoration of headwater systems, how watersheds function, and the role people play in supporting healthy natural areas.
Participants will explore local green spaces, learn about restoration efforts in the watershed, and discover how these projects help build resilience to climate impacts.
Westlake HOA Area
• Saturday, April 11 | 1:00–2:00 PM
• Saturday, May 9 | 1:00–2:00 PM
• Saturday, June 13 | 1:00–2:00 PM
Mountain Park HOA Area
• Saturday, April 25 | 10:00–11:00 AM
• Saturday, May 23 | 1:00–2:00 PM
• Saturday, June 27 | 1:00–2:00 PM
Each tour takes place at a different location within the Westlake or Mountain Park neighborhoods. The specific meeting address will be provided after registration.
What to know:
Dress for the weather—waterproof boots and layers are recommended, as some areas may be wet or muddy. Youth ages 16–18 may attend independently with a signed waiver. Youth under 16 must attend with an adult. Registration and waiver are required.