Aubrey Davis Park Master Plan

boy on scooter near playground


The Park on the Lid, the Mountains to Sound Trail, the Boat Launch and the Greta Hackett Outdoor Sculpture Gallery are all part of Aubrey Davis Park. The City of Mercer Island is leading a master planning process through the fall of 2019 and we need your input! Please help shape the future of this essential community park by participating in the discussion below!


The Park on the Lid, the Mountains to Sound Trail, the Boat Launch and the Greta Hackett Outdoor Sculpture Gallery are all part of Aubrey Davis Park. The City of Mercer Island is leading a master planning process through the fall of 2019 and we need your input! Please help shape the future of this essential community park by participating in the discussion below!

Do you have a question related to the Aubrey Davis Master Plan?  Please submit your question here and staff will provide a response.

Have a question? Ask it here!

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  • Hello I am understanding the park where the baseball field may have turf put on it.. This is dangerous to our children, adults and animals.. There are studies on Washington turf and sports.. where 3-4 players were diagnosed with the same cancer a few years apart… Im in remission yet with the possibility of this being a factor I strongly suggest leaving “real grass” in for safety and natural beautiful Coleen Sanders 949-322-8703

    coleen sanders asked 30 days ago

    Hi Coleen,

    Thanks for expressing your concerns and preferences.  At this level of master planning we would probably not specify the exact construction of any synthetic turf field. However, you should know that the City's most recent turf project at Island Crest Park used natural cork infill instead of crumb rubber because of citizens' concerns like yours.  So synthetic turf can be installed without  material that are suspected for health problems.

  • Are there plans to resurface the tennis courts? Three out of four are badly cracked and unplayable.

    Clare asked 27 days ago

    Hi Clare, thanks for asking. 

    We will evaluate the courts and post here any updates we have.  We last resurfaced them in 2012.  

  • Concerned about maintaining the beauty (control graffitti, vandalism, littering, needles, plant destruction), security and safety of the park (buildings, equipment, restrooms, lighting, surveillance camera) and parking availability (not only for handicap) for those who don't bike or live in the convenient vicinity of the park neighborhood. With public funds stretched and type of population (squatting, drug abuse, violence against those who come to enjoy the park) that light rail may be facilitating access and attracting, what proactive plans are being considered and funded other than property taxes and car tabs.

    Alice asked about 2 months ago

    Thank you for your question. Security and safety are certainly priorities as we move forward with a master plan for Aubrey Davis Park. A master plan will allow us to anticipate changes such as the Light Rail and plan for how this may affect the park in the future.

    The Aubrey Davis Master Plan will incorporate Crime Prevention through Environmental Design (CPTED) concepts and use these as guiding principles when designing concepts for new park facilites. CPTED considers several aspects of design:

    Natural Surveillance: Park elements being designed so that there are public eyes on vulnerable areas.

    Natural Access Control: Clear definition between public and private spaces, which makes the transition difficult for unauthorized users.

    Natural Territory Reinforcement: Creates the perception of “ownership” in a space, so people only feel invited if they know they are supposed to be there.

    Pro-active maintenance of the park.

    These principles have been developed by urban planning, sociology, architecture and criminology professionals over the last 50 years, and have been shown to drastically reduce crime, and pre-criminal behaviors.

    In addition, Parks & Recreation will work closely with the Mercer Island Police Department, King County Metro and Sound Transit to respond to bus riders or transients who are engaged in criminal behavior. As the opening of the Light Rail Station approaches, MIPD plans to train with Sound Transit officers to prepare for security operations and any possible impacts to our community. The goal is for all users of the light rail, and Mercer Island community members to enjoy a safe commuting environment and a safe community. The Aubrey Davis Master Plan concepts are being designed to support this goal.

    We anticipate cars will continue to be a primary means of transportation to and from the park for many Mercer Island community members. We are still exploring options for ADA parking and also mindful of preserving Aubrey Davis parking areas for local community members, not commuters. We have not yet identified a clear path for parking, but this remains top of mind as we continue the Aubrey Davis Master Plan process.



  • Can you open comments on the Bike/Ped count thread, so questions and answers pertaining to that document can be asked/answered there to provide context? My specific questions: what does "entire trail corridor" mean? The WSDOT map shows only a single, specific sample site along the I-90 trail the island (NMW with SE 26th ST). Other collection points are either not on the trail (SE 84th & SE 26th; SE 27th St and 76th Ave SE) or not on the Island (I-90 Trail at East Channel Bridge. Is this the point at NMW& SE 26th St from which those counts were collected? Or did they have some methodology for synthesizing the count based on samples from all these sites? If it's the former, as raised in Sept 25 meeting, many cyclist - especially commuters - bypass that by diverting north of P&R onto SE 24th / 84th Ave SE. Even if it's the latter, I would expect their methodology to undercount local, non-commuting usage of the I-90 trail substantially. So as a guide for Aubrey Davis Park Master Plan, I'm not sure how informative these numbers really are.

    Erik asked 5 months ago

    Hi Erik,

    There is now a comment section open and available on the Bike/Ped count thread. These counts are just one piece of information that we are using to look at uses and needs for the master plan.  We realize they have limitations as you point out and this is taken into consideration in the analysis of trail use. It is beyond the scope of this effort to perform comprehensive trail use counts specific to Mercer Island. We will pass along your clarifying questions to WSDOT to see if they can provide additional information on their methodology and locations for their data.


  • Recently Field A of the lid park (next to the bathrooms) was restriped for I believe a soccer field. Can you answer the following questions re: the restriping: 1. Was there any public notice or public participation in the decision to restripe the field. Who approved this decision? I have attended all three Aubrey Davis Master Plan focus group meetings, including active and passive recreation, and don't remember any notice of the restriping of Field A? 2. What is the purpose and basis of the restriping? Did someone or a group request the new restriped field? 3. Who is eligible to use the restriped field, and can off Island groups reserve and use the field? 4. What is the schedule for the restriped field, and where can I find that. 5. What is the cost to reserve and use the field? 6. Is the restriping temporary or permanent? 6. The grass growing season has ended. In the past Field A would be closed to preserve the grass. What are the plans to restore the grass condition from the use on the new restriped field? 7. Field A is the main multi-use part of the lid park, with pedestrians, dog walkers, and recreational users. The new restriped field effectively consumes all of Field A. What are the rules for using Field A when there is an organized on the new restriped field? Are citizens prohibited from using this part of the lid park during an organized event on the new restriped field? Thank you.

    Daniel Thompson asked 7 months ago

    Hi Dan, I hope these responses are what you are looking for.

    1. Was there any public notice or public participation in the decision to restripe the field. Who approved this decision? I have attended all three Aubrey Davis Master Plan focus group meetings, including active and passive recreation, and don't remember any notice of the restriping of Field A?

    Our field configurations at all of our athletic field sites change seasonally as part of ordinary park operations according to our field use policy. We do not provide public notice for field striping.

    2. What is the purpose and basis of the restriping? Did someone or a group request the new restriped field?

    The fields were restriped to accommodate soccer.  Soccer is the designated priority fall sport.  Lacrosse and baseball are the priority spring sports.  No individual renter requested the soccer striping. Rental customers can request additional striping for an extra cost.

    3. Who is eligible to use the restriped field, and can off Island groups reserve and use the field?

    Field use is open to any group that reserves the field per our current field use policy and registration procedures.

    4. What is the schedule for the restriped field, and where can I find that.

    We can provide field schedules via a public records request. When submitting a public records request, please indicate the date range you are interested in so that we can do an appropriate query in our registration system.

    5. What is the cost to reserve and use the field?

    Field rental costs are available on our athletic field fees rate sheet. 

    6. Is the restriping temporary or permanent?

    This is a natural grass field. All striping is temporary and changes occasionally based on field reservations.

    7. The grass growing season has ended. In the past Field A would be closed to preserve the grass. What are the plans to restore the grass condition from the use on the new restriped field?

    The field is to be closed around or after Thanksgiving.  It will be closed until March.  Grass fields are renovated on a annual schedule. Typically the field is groomed four times a years with a combination of aerating, fertilizing and seeding.  Specific treatments are tailored to the specific condition of the turf.

    8. Field A is the main multi-use part of the lid park, with pedestrians, dog walkers, and recreational users. The new restriped field effectively consumes all of Field A. What are the rules for using Field A when there is an organized on the new restriped field? Are citizens prohibited from using this part of the lid park during an organized event on the new restriped field? Thank you.

    Yes, when the athletic field is reserved for an organized activity, all other uses must relocate. This is standard protocol for all athletic fields.  Mercer Island City Code additionally prohibits animals from athletic fields when practices, games or other organized sports are in progress.


  • Many trees have died between Sunset Highway sculpture park and the freeway. This exposes the new light rail station and opens up noise and carbon emissions for those of us living in the 77 Central apartments facing I-90. Will there be replacement trees to combat noise and air pollution as envisioned by Aubrey Davis?

    dennyhenkel asked 8 months ago

    Hello Denny, 

    We are very aware of the tree loss in Aubrey Davis Park.  Tree replacement has been put off because we need the master plan to address the underlying conditions that have led to tree mortality and identify what the capital needs are to sustain the landscape.  You are right, the landscape was an integral part of the original project to mitigate the impact of the expanded freeway through Mercer Island and we will consider different ways to restore the landscape as part of the Master Planning process.. We recommend that you comment about this topic on Let’s Talk to make sure your perspective is part of the public record.

    The trees in the highway canyon are not part of Aubrey Davis Park and are solely maintained by WSDOT.  They are outside of the scope of the master plan.


  • When will the city receive the bike count data for the Aubrey Davis Trail corridor and post that on this site? My last question 8 days ago requesting this information and the city's answer is below and noted the city had requested this information from WSDOT. Will the data include uses other than bicycles? How did WSDOT obtain the data? How was the city able to recommend a trail width east of the town center based on estimated future use of the trail without any use data? How did the city estimate future use on the Trail? What was the city's estimated future use on the Trail broken down for bicycles, pedestrians, and other users?

    Daniel Thompson asked 8 months ago

    Hi Daniel, 

    We recently received pedestrian and bike count data from WSDOT for the I-90 trail. The report shows a daily and monthly pedestrian and bike count from 2016-2018, along with an overall monthly average. The report can be found in the Document Library to the right, or simply click here.

    For more information on how this data was collected and to visit the WSDOT Bicycle & Pedestrian Count Portal, click here:

    https://www.wsdot.wa.gov/data/tools/bikepedcounts/

  • I just posted a public comment but don't see it popping up. Will all comments submitted be posted on the Lets Talk site or is it only viewed by staff?

    Christoph Lee asked 8 months ago

    Hi Christoph, 

    Your public comment was posted on Saturday, it sometimes takes a few minutes after submitting to upload. Please let us know if you have any further difficulties with posting. All comments submitted will be posted as long as they follow the moderation policy.

    Thank you for your participation!

  • Can you please update the focus group and citizens on the following questions: 1. When will the focus group receive their comments from the outside vendor from their Sept. 25 meeting? 2. When will the focus group receive the data on the use of the trail, for each different section as promised? 3. The decision on the trail east of the town center is due in about two weeks according to King Co. and the city. What is the status of that decision, and will the focus group members be included in the decision considering they met on Sept. 25 to specifically discuss and decide the trail issue and tree replacement along the trail?

    Daniel Thompson asked 8 months ago

    1. The meeting notes from the 9/25/18 focused discussion on trails are now posted to the Let's Talk site under the documents folder. Apologies that it took longer than anticipated to prepare these notes.

    2. The data referenced at the 9/25/18 public meeting was the bike count data from WSDOT for the entire trail corridor. This data has been requested from WSDOT and will be posted to the Let's Talk site as soon as it is available. 

    3. The feedback gathered from the participants at the 9/25/18 public meeting was compiled along with feedback from other recent outreach efforts. This information was used to inform a recommendation on the 1.3-mile portion of the I-90 Trail impacted by the King County Sewer Project. This information, along with a recommendation on the trail design standards, will be presented to the City Council at the Study Session on 10/23/18. A link to the City Council packet materials will be posted to the Let's Talk site as soon as the materials are available.

  • The "Map Your Input" screen is centered on the western portion of the park, and when I try to drag it east it always jumps back. Aren't the eastern sections in scope?

    Erik asked 9 months ago

    Hi Erik, 

    Thank you for your feedback! We have adjusted the scope of the map to include all parts of the park, and you should now be able to zoom in to specific parts of the park to add your input.

    Please let us know if you continue to have any issues with the map. We appreciate your participation!


  • RE: Status of Decision On Trail For King Co. Sewer Project From: Dan Thompson <danielpthompson@hotmail.com> Sent: Monday, October 1, 2018 11:46 AM To: Paul West <Paul.West@mercergov.org>; Meg Lippert <meg.lippert@gmail.com> Cc: Al at Cornell <aql1@cornell.edu>; Jackie Dunbar <jadunbar@comcast.net>; Peter Struck <struckmi@aol.com>; Jocelyn Antilla <5antillajs@gmail.com>; Jessi Bon <jessi.bon@mercergov.org> Subject: Re: Status of Decision On Trail For King Co. Sewer Project Hi Jesse, when we spoke last week you mentioned that the city's decisions on the ADP trail had to be made quickly -- sometime in October -- to give King Co. notice of the proposed trail after the sewer line is replaced, although my understanding is King Co. won't get going on the project -- or complete it -- for a long time. Can you let us know when those decisions on the trail are due, and which parts of the trail we are talking about, i.e. is it only the portion of the trail east of the town center, or the entire trail. There was also suppose to be a discussion on tree replacement along the trail. Also I was wondering if you or Paul could include all the focus group members in your reply email so we have a method to communicate and stay involved in the trail issue, especially if any decisions have to be made on the trail before the next focus meeting on Oct. 25. I am pretty sure I have Bharat's and Sue Stewart's and NIM's email somewhere but would appreciate it if you could include all the focus group members in your reply so they don't feel decisions are being made without their input (our earlier emails are attached for everyone's easy reference). Could you also send us the summary of the comments from the focus group so we can review them. Last weekend I attended a dinner party with many avid MI bicyclists, and their opinions reflected the opinions at the focus group, which highlighted the following: A. There are three distinct parts of the trail: 1. WMY to the east of end of the lid park; 2. through the TC; and 3. from the east end of the TC to the East Channel Bridge. B. Avid pedal bicyclists including commuters prefer to use the roads and not the trail, and right now avoid the TC and lid park. I don't think one solution will work for each distinct part of the trail. We can't design a bike path through the lid park that allows bicyclists to ride faster than 10 mph for safety reasons, and avid bicyclists don't want to ride through the lid park anyway but want more room on WMW and NMW from WMW to the TC. Even after the TC avid pedal bicyclists prefer to ride on NMW to the East Channel Bridge rather than on the trail, which can be congested, especially at high speeds. I would also appreciate receiving any data on the use of the three distinct parts of the trail, and some idea where the secured covered commuter bike parking will be when the new light rail station opens so we can figure out how to get commuter bicyclists to and from the station, from the west and south of MI. I don't see how we can make any decisions on the future of the trail without this information. Although we were asked to assume huge increases in future commuting by bicyclists recent data from Seattle suggest MI will never have more than 3% of all commuters commuting by bike. That means the ADP trail will overwhelmingly be used by pedestrians and recreational bicyclists. In the end I think the trail will need to reflect the fact primary users will be pedestrians and recreational bicyclists, and moving E bikes and serious pedal bicyclists off the trail might be the best strategy. I just don't see how pedestrians, recreational bicyclists, E bikes and serious pedal bicyclists can share the same trail, no matter how wide it is, because at some point different parts of the trail would have to become dedicated, which creates even more congestion for some uses. I disagree with King Co.'s proposed trail width of 14' to 18', certainly through the lid park, because I don't think it will be necessary, will create too much unnecessary impervious surfaces, and some of that money should go towards improving bike lanes along the roads where E bikes and serious pedal bicyclists prefer to ride, and probably should ride, because you cannot safely mix 25 mph bicyclists and pedestrians, children, and recreational bicyclists on the same trail, although of course this is only my opinion, and I will be interested to hear from the rest of the focus group and review the data. If we have a looming deadline I hope we can get going on the trails issue as soon as possible, hopefully this week at the latest. Thank you. Daniel Thompson Thompson & Delay Attorneys at Law 506 2nd Ave., Suite 2500 Seattle, WA 98104 Phone: (206) 622-0670 Fax: (206) 622-3965

    Daniel Thompson asked 9 months ago

    Thank you for posting this email to the Let's Talk page. The questions were extracted from the email above, with staff replies posted below.  

    Question: When we spoke last week you mentioned that the city's decisions on the ADP trail had to be made quickly -- sometime in October -- to give King Co. notice of the proposed trail after the sewer line is replaced, although my understanding is King Co. won't get going on the project -- or complete it -- for a long time. Can you let us know when those decisions on the trail are due, and which parts of the trail we are talking about, i.e. is it only the portion of the trail east of the town center, or the entire trail.

    Reply: King County has asked the City of Mercer Island to provide a recommended on the preferred trail design by the end of October. This applies to the easternmost portion of the I-90 Trail only, which is the portion of trail impacted by the King County sewer replacement project. Staff will post a map to the Let's Talk site so that the limits of this phase of work are clear. The remaining portions of trail will be analyzed and discussed as part of the ongoing Aubrey Davis Master Planning project. Important to note that the Washington State Department of Transportation (WSDOT) is a partner in this project (they retain underlying ownership of much of the trail) and they will participate in the trail design recommendations associated with the sewer project. WSDOT will also be an active partner in the broader master planning process.

    Question: There was also supposed to be a discussion on tree replacement along the trail.

    Reply: The City of Mercer Island will review the proposed planting plan and tree replacement proposal as part of the permit process for the King County sewer project. The broader Aubrey Davis tree and vegetative planning work will be considered as part of the ongoing master planning process.

    Question: Also I was wondering if you or Paul could include all the focus group members in your reply email so we have a method to communicate and stay involved in the trail issue, especially if any decisions have to be made on the trail before the next focus meeting on Oct. 25.

    Reply: Looking ahead, we encourage questions to be posted to the Let's Talk site. Staff replies will also be posted for all to review. The staff team appreciates the assistance with the transition from email inquiries to the Let's Talk site.

    Question: Could you also send us the summary of the comments from the focus group so we can review them.

    Reply: The notes from the 09/25/18 meeting were intended to be posted to the Let's Talk Page by 10/09/18. They notes have not yet been received from the consulting team. Staff reached out today (10/10/18) and will make every effort to post them by the end of the week.

    Question: I would also appreciate receiving any data on the use of the three distinct parts of the trail, and some idea where the secured covered commuter bike parking will be when the new light rail station opens so we can figure out how to get commuter bicyclists to and from the station, from the west and south of MI.

    Reply: A map of the various segments of Aubrey Davis Park will be forthcoming. The point is well taken that this is a long linear park, with varying uses, impacts, and needs depending on your location in the Park. Any data available will be posted to this site. Staff are currently in the process of uploading reference material to the site.