Local Issues



Native Tree Thinning Project at Columbia Children's Arboretum

Good Afternoon All,

I want to let you all know of a special project we are conducting at Columbia Children’s Arboretum this winter that we hope won’t affect your use of the park. PPR will be removing native trees to improve the overall forest health at CCA in the next week or two.

As you know, thousands of trees, shrubs and ground covers have been planted at CCA to restore the ecological functions of the site.  However, several dozen of those trees have become so dense that in some areas of the forest they are choking each other out.  Most of the trees are so crowded that only the very top of the tree has any green canopy.  Additionally, the more complete shade under the trees has prevented native shrubs and ground covers from establishing, leading to reduced habitat value for animals, poor water quality in the nearby slough channels, and higher rates of homeless camping on the bare soil.

In the coming 2 weeks, some trees will be girdled so that they die slowly, providing snag habitat for the hundreds of bird, mammal and insect species that are found at CCA.  Other trees will be completely cut down and the wood will remain on the ground to enrich and de-compact the forest soil.  In Winter/Spring 2019, community members and school groups will be planting hundreds of shrubs and ground covers in the newly thinned areas.

Special care has been taken to select trees that are less than 12” dbh for removal and that are of varying sizes and species.  The goal is to have a forest with a diversity of tree species and ages.

This project is being conducted and monitored under a Type 1x Land Use permit (#LU 18-251306EN; attached).

Please share this information with anyone else you know who uses Columbia Children’s Arboretum and let me know if you/they have any questions.

Laura Guderyahn (she, they (either))
Ecologist | Lands Stewardship
Portland Parks & Recreation

Office Location: 8931 SE Flavel St, Portland, OR

Mailing Address: c/o Laura Guderyahn @ CNE (B-460)

Mt Tabor Yard, 6437 SE Division St, Portland, OR 97204
503-823-6736 (mobile)
This email address is being protected from spambots. You need JavaScript enabled to view it." target="_blank">laura.guderyahn@portlandoregon.gov



Tree Planting

Saturday, January 12, 2019
Columbia Children's Arboretum and East Columbia neighborhood planting (NE Portland)
WhenSat, January 12, 2019, 8:45am – 1:00pm
Where10040 NE 6th Dr, Portland, OR 97211, USA, Green Space Events (map)
DescriptionWe will be planting hundreds of native trees and shrubs and removing invasive species including Himalayan Blackberry and English Ivy at this special gem of a site -- and your help is what makes this community planting possible RSVPs kindly requested.

In addition to the planting activities at the Columbia Children's Arboretum, we'll also be planting a handful of large-stock trees in the adjacent East Columbia neighborhood.  If you live in East Columbia and are interested in receiving a tree, please order trees here.

Please arrive by 8:45am to sign-in and enjoy some breakfast treats and coffee, tea, or hot chocolate. The planting starts promptly at 9:00am. We provide gloves, tools, and guidance, so all you need to do is show up dressed for the weather and wearing sturdy shoes or boots – and be ready to have fun!

How do I register? All individuals and groups are kindly asked to RSVP to save your spot(s) by filling out our quick Registration Form. Registration is highly recommended but not required.

Under age 18? A signed youth waiver is required for you to volunteer. We ask that youth 15 years and younger are accompanied by an adult.

Friends of Trees is excited to partner with Portland OIC, Portland Parks & Recreation, the Columbia Slough Watershed Council, and Friends of the Columbia Children's Arboretum with support from the Port of Portland, East Multnomah Soil & Water Conservation District, Metro, and the National Fish & Wildlife Foundation to restore a part of one of NE Portland's "hidden gems": the Columbia Children's Arboretum. 

Please contact Jenny, Pablo, and Carey at (503) 595-0213 if you have questions or need any further information. We look forward to seeing you out there!

Thank you to our event sponsor, Port of Portland!
Anne Marie Santos 
Pronouns: she/her/hers
Green Space Specialist
Friends of Trees
cell: 847.962.7075
Pizza and Beer are ON US! Support Friends of Trees through the Willamette Week Give!Guide for a free slice and a pint!  



U.S. Corps of Engineers study


The US Army Corps of Engineers has successfully launched their New Start Feasibility Study of the Portland metropolitan area levee system, and as they work through the initial scoping phase, they would like to engage community members in discussing the study process, upcoming milestones, and the preliminary alternatives being developed.

To begin the conversation, we’re working with Corps to hold two open-house style community meetings in December:
Wednesday, December 12, 2018
5:30 p.m. – 7:00 p.m.

Rockwood Public Safety Building
675 NE 181st Ave, Gresham
accessible via TriMet Blue Line & Bus #87 & #25
Thursday, December 13, 2018
5:30 p.m. – 7:00 p.m.
Mult. Co. Drainage District Office

1880 NE Elrod Drive, Portland
accessible via TriMet Bus #70
During both meetings, a representative of the Corps will make some brief remarks around 6:00 p.m. and the Corps and Levee Ready Columbia will have staff on hand to discuss the various activities underway to inform decision-making around the modernization of the levees, including hydraulics and hydrology (flows and flood risk), geotechnical studies of the levees themselves, and the economic risk and consequences posed by various flooding scenarios, as well as the effects on natural and cultural resources of alternatives considered. Most importantly though, the Corps would like to hear the concerns and ideas of community members regarding the Columbia Corridor levee system and managed floodplain.

We hope you will take advantage of this opportunity to come together as a community to provide input on the direction the Corps is heading as they work through the three-year federal feasibility study process, which will lead to a recommendation to Congress for federal investment in addressing the problem areas and vulnerabilities in our local levee and drainage system.

If you have any questions or specific needs, please address them to our Public Affairs Manager at This email address is being protected from spambots. You need JavaScript enabled to view it..

We look forward to seeing you soon!

Team LRC  
Copyright © 2018 Multnomah County Drainage District, All rights reserved.
You are receiving this email because you opted in on our website or requested to be included when we send out important information.

Our mailing address is:
Multnomah County Drainage District
1880 NE Elrod Drive
Portland, OR 97211


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