Virtual Open House for Lower North Creek

Web Header - North Creek at 240th

Welcome to the Lower North Creek Virtual Open House! 

Open Nov. 16 - Dec. 31, 2020

City of Bothell would like to share information with you about our Surface Water Management Areas (SWMAs), including what their characteristics are and how we delineate and prioritize each area. Bothell has 11 SWMAs, and we are asking for your involvement in planning and prioritizing activities for each area, beginning with Lower North Creek.
This virtual open house is specifically for the Lower North Creek Surface Water Management Area. We will ask for your feedback about each of the remaining 10 areas beginning in 2021. 

Please take a look at the information below to learn more about the Lower North Creek SWMA. You can find the activities we're considering under the "Possible Efforts and Activities" tab below. Then submit your comments by 11:59 p.m. on Dec. 31, 2020, either online or in writing to: City of Bothell Public Works, Attn: Christi Cox, 18415 101st Ave NE, Bothell, WA 98011.
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Community Meeting Dec. 17, 2020

7 - 8 p.m.

Surface Water staff held a one-hour community meeting through Zoom on Dec. 17 to provide general background information about Bothell's Surface Water Management Areas and to answer questions. Thank you to all who attended! If you missed it, you can click here to watch a YouTube recording of the meeting.

Click to watch recording of Dec. 17 community meeting

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Learn about the Lower North Creek SWMA

  1. About Lower North Creek
  2. Possible Efforts and Activities
  3. Data Table for Lower North Creek
  4. Data Dictionary

General and Physical Character

The Lower North Creek SWMA makes up 3.64 square miles with 65.79 percent (2.40 square miles) within City limits.

Very severely erosive soils also classified on steep slopes (>40%) make up 2.53 percent of the SWMA. Compared to other SWMAs, 2.53 percent is the fourth lowest.

The City had a detailed study of this area performed in 2006, titled the North Creek Fish and Wildlife Critical Habitat Protection Area Study. This study delineated and assessed the importance of wetlands, streams, and other critical areas and their contribution to the quality of cool groundwater inputs to North, Palm, and Woods/Cole Creeks.

Land Use and Development

The prominent land use feature of this SWMA is residential with 36.7% of total parcel area with the second highest land use being commercial with 26.6% parcel area. 

Thirty-three percent of the area is covered by impervious surfaces. Of the impervious area, approximately one-fourth of the area is road surface (pollutant generating).

Natural Environment

The area includes two streams (Palm Creek and Woods/Cole Creek) and an area that drains directly to North Creek. The total stream length within the SWMA is 16.96 miles. Twenty-two percent of the SWMA is mapped as wetlands and associated buffers. 

The City has assessed habitat and biologic conditions for Lower North Creek at Palm Creek and found it to have the least impaired biological community of all streams in the city, though the creeks are still severely to moderately impaired. All streams in the SWMA are known to have low dissolved oxygen levels and high temperatures and are on Ecology’s 303(d) list for impaired water bodies for fecal coliform.

Stormwater Infrastructure

The amount of total stormwater conveyance is 107 miles (29.39 miles/square mile) with 4,009 catch basins within the SWMA. The SWMA has 26.7 control structures per square mile and 114.4 water quality treatment facilities per square mile.

Surface Water Management Strategies

This SWMA has some of the higher quality basins that support North Creek in Bothell. Staff has selected Lower North Creek as its SMAP high-priority basin. Surface Water efforts will focus on protecting and preserving stream buffers and enhancing stormwater controls to the relatively higher quality creeks in this area.

Aerial Map of Lower North Creek SWMA (click to open as a PDF)

Lower North Creek SWMA Map

Map of SWMA Delineation within Bothell (click to open as a PDF)

SWMA Map - All