Thornton Creek Confluence Updates
November 4, 2013
The Thornton Creek Confluence project team will be at the November 14 Meadowbrook Community Council meeting to provide project design updates and answer questions from the community. The meeting is held at the Meadowbrook Community Center (10517 35th Ave N.E.) and will begin at 7:00 p.m.
September 26, 2013
The Washington State Environmental Policy Act (SEPA) Checklist and Determination of Non-Significance were issued on September 26, 2013. The proposed Thornton Creek Confluence project addresses the undersized culvert on 35th Ave NE, local urban flooding, and improved in-stream habitat and water quality. The environmental impacts of the proposed project have been analyzed and SPU has issued a Determination of Non-Significance:
SEPA Checklist (pdf)
Determination of Non-Significance (pdf)
December 21, 2012
November 8, 2012
Wednesday, November 14th - 6:00 to 7:30 p.m.
Nathan Hale High School "Commons"
10730 30th Ave. NE
View Flyer (pdf)
Follow up on Comments on 60% Design (pdf)
Graphic Summary of 60% Design Changes (pdf)
Responses to Comments (pdf)
September 10, 2012
SPU received many comments from the public regarding the 60% design of the Thornton Creek Confluence Improvement project throughout August. View a compilation of those questions and comments (pdf).
Thank you to all who took the time to provide feedback – it is greatly appreciated! SPU will be evaluating these comments in September and deciding if and how to incorporate suggestions into the next stage of design, given the primary goals of the project are to reduce flooding and improve Thornton Creek’s natural habitat.
August 7, 2012
A meeting was held at the Meadowbrook Community Center on August 2nd to present the 60% designs for the Confluence project. View the presentation (pdf).
Some parts of the design are already fixed. These include the location and size of the new culvert to go under 35th Ave. N.E. and the stream channel, a design based on stream flows, scientific hydraulic properties, fish passage regulations and other factors.
All comments are welcome, but SPU would like input on these particular areas by August 31:
- To improve habitat and create more flood storage, we need to remove about 13 poplar trees west of 35th Ave. N.E. Is this an acceptable trade-off?
- The existing gravel lot at the end of 36th Ave. N.E. will go away. Should another gravel area be provided for parking along 36th?
- Culvert replacement under 35th Ave. N.E. will require 3 to 7 weeks of construction, depending on full versus partial road closure. This will impact travel on 35th. Do you prefer a full road closure and shorter duration (3-4 weeks)?
- In order to maximize flood storage, the plans currently have no paths through the site and show removal of the existing footbridge near the 36th Ave. N.E. street end. Is there a preference for allowing some limited pedestrian access versus keeping the area natural?
- Would an overlook from the 35th Ave. N.E. sidewalk be preferred in place of a path through the site or in addition to?
July 20, 2012
Thursday, August 2 - 7:30 to 8:30 p.m.
Meadowbrook Community Center
10517 35th Ave. NE
Question & Answer Session
Saturday, August 4 - 10 a.m. to noon
Confluence Project Site
10720 35th Ave. NE (Approximate location)
Both sessions are for SPU to present the 60% designs for the Confluence project and to solicit input, suggestions and public concerns about the work. A design overview and full set of 60% design drawings are posted below. We would like to have feedback on what you see, though some items – such as the 35th Ave NE culvert location and size and the stream channel dimensions and location – are fixed due to hydraulics and site constraints. All comments are welcome but particular areas we’d like feedback on are:
- To improve habitat and create flood storage west of 35th, we need to remove approximately 13 poplar trees on the west side of 35th. Is this an acceptable trade-off?
- The gravel area at the south dead end of 36th Ave NE will go away. Should another gravel area be provided for parking on the east side of 36th?
- Culvert replacement under 35th Ave NE will require 3-7 weeks of construction, depending on full closure versus partial street closure. This will impact travel and potentially reduce bus service on 35th. Or would you prefer a full road closure and shorter duration (3-4 weeks)?
- In order to maximize flood storage, the plans currently have no paths through the site and show removal of the existing footbridge near the 36th Ave NE street end. Is there a preference for allowing some limited pedestrian access versus keeping the area natural?
- Would an overlook from the 35th Ave NE sidewalk be preferred in place of a path through the site or in addition to?