SR 520 Westside Corridor Design Principles

UNIVERSAL AESTHETIC VALUES .0 Values describe the foundation upon which principles and measures of project integrity are based. 2 They are statements of the project team’s highest priorities and core beliefs, and aligned with the values expressed to date by the communites. The design principles for each area and place within CORRIDOR the Westside corridor are grouped according to these values.

Culture Nature Design Materials GOALS, THEME Community values and Nature and the natural Design integrates the The use of materials the layers of history and surroundings are valued functions of the natural throughout the project MOTIFS AND MATERIALS culture are the sources of CULTURE and protected for the setting with the cultural fulfill their immediate NATURE inspiration for design. functions they serve and purposes and uses of the DESIGN and long-term functional VALUES the settings they create. community to produce needs, conserve a facility that stands the resources, while tests of time. maintaining a high degree of visual quality.

.0 1. Draw inspiration from the character of 1. 1. Use a coherent vocabulary of forms, 1. Use high quality and durable materials. the existing community and its history, design. materials, color, character, and texture 2. Consider ease of maintenance and 3 and find value in things that are often 2. reducing maintenance requirements in overlooked. 2. the design. 2. Create a sense of place through spatial to enjoy similar views. 3. design, relationships, and details 3. Protect vulnerable places that may be community, urban development, and at all scales to foster pride and a sense UNIVERSAL that tell the story of its history and nature. of community ownership. landscape. 4. 3. Create a sense of rhythm at a variety 4. Select designs through a careful AESTHETIC 3. Create opportunities for “incidental of scales through a hierarchy of and civilities” where people can rest, cross 5. Design to promote dark sky goals across paths with others, and feel comfortable. the corridor. PRINCIPLES 4. Use wayfinding and interpretive signs, 4. energy. landmarks, and design details to help design elements to the viewer’s distance The Universal Aesthetic Principles are action people orient themselves. from the object and speed along the statements that apply the Universal Aesthetic 5. Connect places with paths and portals corridor or path. Values to the SR 520 project corridor as a whole. that are inviting and draw people toward 5. They describe how places near or elements of a social space. elements or structures as places for the facility could interrelate to meet the aesthetic 6. Provide continuity of path connections design elements that help create visual goals of the corridor. and multiple route options. 7. Identify places of cultural or community 6. Create safe spaces using Crime distinction and regional continuity. 8. Develop East-West corridor unity Design (CPTED) strategies such as high throughout the adjoining SR 520 projects. 7.

and for a variety of viewer experiences (boaters, joggers, walkers, cyclists, transit users, and drivers). 8. and materials that are visible from the corridor to support rhythm and corridor

9. Use landscaping to screen residences from public spaces to increase sense of privacy for residents. 10.

on bridges, structures, landscapes, and other features of the SR 520 corridor.

1. Preserve the Olmsted legacy by 1. Maintain or restore natural ecology. 1. Reveal and express the beauty inherent 1. .0 applying Olmsted principles of Scenery, 2. in the structure of the bridges. the local residents for the open space 4 overuse. 2. Design bridges to have a graceful, that will be created by the lids, so that 3. Evaluate views of Lake Union, Lake maintenance and safety in these spaces design. Washington, the Olympic and Cascade 3. become points of public pride and are 2. mountains, the Arboretum, Mount types and sizes to be smooth and self-reinforcing. WESTSIDE 520 graceful. 2. enjoy similar views. 4. especially in places where people will 3. Develop physical north-south 4. materials to create a sense of rhythm CORRIDOR and avoid monotony. features on lids, paths and in under- as unifying elements. context, with a record of survivability in 5. Design bridge components to enhance bridge areas. PRINCIPLES similar contexts. 3. Select elements such as rails and signage 5. with a high standard for durability and and integrate into new landscapes. 6. maintenance. The Westside Corridor Design Principles and Criteria describe the desired visual and aesthetic features. character and qualities of the corridor between 7. I-5 and the west high rise of the Evergreen Point of elements, to enhance awareness Floating Bridge. of changes in speed and approach to

DESCRIPTION 8. The rolling terrain of northeast Seattle is materials visible from the neighborhood comprised of a north-south trending ridge-valley system that slopes northward toward the basins 9. containing Lake Union, Portage Bay, and Union Bay. This unique landscape required the SR 520 explore cut, elevated, and bridged community character. profiles. Thus, four distinct project areas within the Westside corridor are defined by these basins and plateaus. They are the Roanoke plateau, the enclosed Portage Bay basin, the Montlake hills, and the expansive Union Bay basin.

DRAFT August 2011 Roanoke Design Principles .1 4 ROANOKE AREA

AREA PRINCIPLES CULTURE NATURE DESIGN MATERIALS

1. Retain and enhance neighborhood 1. Evaluate views from 10th 1. Design the ramp bridge connecting 1. Select materials that are consistent connections to Roanoke Park and Avenue East toward the Olympic I-5 and SR 520 to be graceful. with the character of the homes in Interlaken Park. Mountains and to Portage Bay the Roanoke historic district. 2. Use the lid to reconnect and the Cascade Mountains to community activity centers. the east, and provide 3. Use interpretive markers to opportunities to enjoy similar describe the evolu tion of the views. Olmsted landscape and the effects of SR 520 on the landscape.

10th & DELMAR PRINCIPLES

1. Conserve and reuse elements 1. Select a lid planting palette that 1. Create aesthetic continuity between 1. Select materials complementary from the existing Bagley relates to the existing forest the 10th & Delmar Lid and the I-5 to the context and style of the Viewpoint that are valued by the trees and understory adjacent Enhanced Pedestrian Crossing. buildings and Roanoke and Bagley local residents and park users. to the 10th & Delmar Lid. 2. Use the lid as an opportunity to Viewpoint parks. 2. Create lids as urban open spaces Create a natural-looking create additional paths that separate Ensure high quality craftsmanship, 2. 2. that encourage pedestrian transition from lid surface to motorized traffic from especially on the lid where people activities and provide meeting native topography and non-motorized traffic. will have time to observe details places. landscape on north and south 3. Use “visual friction,” like closer and small features. 3. Cultivate a sense of stewardship sides of 10th & Delmar Lid. spacing of elements, to enhance among the local residents for the awareness of changes in speed and open space that will be created approach to nearby intersections. by the lid, so that maintenance 4. Provide a safe pedestrian and safety in this space become connection from the 10th & points of public pride and are Delmar Lid to Boyer Avenue. self-reinforcing. 5. Use natural features and plantings 4. Provide clear pedestrian to screen adjacent residences from connections to Roanoke Park. the 10th & Delmar Lid users. 5. Provide paths across the 10th & 6. Integrate utilities into the 10th & Delmar Lid that are in scale and Delmar Lid structure in a way that style with surrounding minimizes distractions and visual neighborhoods and parks and clutter. accommodate diverse users. 6. Evaluate views from the 10th & Delmar Lid of Portage Bay and provide opportunities to enjoy similar views.

I-5 CROSSING PRINCIPLES

1.Optimize views of the urban 1.Use vegetation along the path to 1. Create aesthetic continuity between 1. Ensure high quality craftsmanship, skylines and Lake Union shoreline. protect diverse users from the 10th & Delmar Lid and the I-5 especially along the pathway nuisances and harm and create a Enhanced Pedestrian Crossing. where people will have time to pleasing, naturalistic environment. observe details and small features. 2. Use pedestrian-scale lighting to provide safe passage along the enhanced pedestrian crossing.

CRITERIA

CRITERIA CRITERIA CRITERIA CRITERIA

DRAFT August 2011 Portage Bay Design Principles 4 .2

PORTAGE BAY BASIN AREA

AREA PRINCIPLES CULTURE NATURE DESIGN MATERIALS

1. Evaluate views from the 1.Ensure the new nearshore 1. Create interesting, attractive, and 1. Select durable materials and neighborhohood to Portage Bay, landscape has characteristics of the easily maintained spaces and finishes that are resistant to mold and provide opportunities to native slope and shore habitat. facilities in under-bridge areas. and staining especially where

enjoy similar views. 2. Support actual and perceived user 2. Avoid crea ting “orphaned” places natural light is not present. safety with appropriate landscape that might become misused or design and planting. feel unsafe. 3. Provide for interpretive and distinctive amenities near shore habitat or surface water treatment.

BOYER STEPS & UNDER-BRIDGE PRINCIPLES

1. Integrate under-bridge areas with 1. Use natural features and plantings 1. Apply CPTED principles to ensure 1. Ensure high quality craftsmanship existing and anticipated Montlake to screen adjacent residences from clear sight lines and visibility west on and around the Boyer steps, as Playfield Master Plan and Interlaken the bridge. and east from Boyer Avenue. people will have time to observe parks, trails, and public 2. Use vegetation and urban features 2. Provide a safe pedestrian details and small features. infrastructure to create intriguing, to provide visual relief and connection from Boyer Avenue to 2. Select lighting quality, luminosity, safe public spaces. discourage potential urban Delmar Drive. and fixtures along the path to 2. Activate the east area of the camping under the bridge and meet lighting standards for safety western Portage Bay Bridge near abutments. and comfort of users, while abutment with community uses or 3. Protect the shoreline from damage enhancing the visual quality of the interpretive features. caused by human activities along the area. 3. Ensure appropriate wayfinding for edge of the undercrossing. 3. Select durable materials and users around pedestrian stairs Provide locations where users may finishes resistant to mold and connecting Bagley Viewpoint Park observe and/or touch the water. staining especially where natural and Boyer Street. 4. Use landscaping features best light is not present. 4. Create intriguing and safe public suited to the physical environment. spaces under the western terminus Specifically, in areas where plants of the Portage Bay Bridge by adding cannot thrive, create programmatic details, educational features, and uses with hardscape treatments picturesque paths. that do not rely on vegetation. 5. Provide a visual connection from Boyer Avenue and the local residences to the shoreline area 6. under Portage Bay Bridge. Use common features to create a unified sense of place from the lid surface down to the Boyer landing. The sequence of places created by the steps should provide restful and safe locations to observe both the bridge superstructure, and local perspectives of the slope and neighborhood.

1. Ensure high quality craftsmanship, MONTLAKE INTERCHANGE PRINCIPLES on and around the Bill Dawson Trail, as people will have time to observe details and small features. 1.Provide wayfinding, safety (e.g., 1.Protect the shoreline from damage 1. Design bicycle and pedestrian 2. Select lighting quality, luminosity, lighting), and aesthetic experience caused by human activities. passage for high quality, pleasant, and fixtures along the path to for Bill Dawson trail users at the east and safe experiences. meet lighting standards for safety abutment of Portage Bay Bridge. and comfort of users, while enhancing the visual quality of the 2. Integrate the under-bridge areas with existing and anticipated area. Montlake Playfield Master Plan and 3. Select durable materials and Interlaken parks, trails, and public finishes resistant to mold and infrastructure to create intriguing, staining especially where natural safe public spaces. light is not present.

CRITERIA

CRITERIA CRITERIA CRITERIA CRITERIA

DRAFT August 2011 Montlake Design Principles .3 4 MONTLAKE AREA

AREA PRINCIPLES CULTURE NATURE DESIGN MATERIALS

1. Connect communities through 1.Highlight the beauty that is inherent 1. Design bicycle and pedestrian 1. See universal/corridor principles.

pedestrian and bicycle paths and in the func tioning of wetlands. tunnels for high quality, pleasant, green space. 2. Enhance the residential feel of and safe experiences. 2. Provide safe passage for each Montlake Boulevard and Lake Design public spaces for multiple user group. Separated travel Washington Boulevard with uses and user groups for lanes for each user group are trees and vegetation. enhanced safety. preferred. 3. Use the landscapes on the north 3. Protect the view along the Rainier side of the westbound off-ramp Vista axis. to create an active buffer between the ramp and the Shelby-Hamlin neighborhood.

MONTLAKE LID PRINCIPLES

1. Choose the site furnishings to 1. Design lid to have soft, pervious, 1. Design the lid surface features to 1. Ensure high quality craftsmanship, create a consistent character green surfaces. create a safe and useable extension especially on the lid where people that is in harmony with the 2. Design lid landscaping and of the community. will have time to observe details community’s goals for landforms with respect for 2. Reflect the influence of the and small features. landscape character uses. natural and/or well-established neighborhood street grid and 2. Cultivate a sense of stewardship landscaping in the vicinity. curvilinear landscape forms. among the local residents for the 3. Conserve and replicate, where 3. Design and create simple portals open space that will be created possible, the planted medians that minimize ornament and by the lids, so that maintenance and tree borders from the distraction, and integrate the lids with and safety in this space become Olmsted and UW plans. adjacent topography and vegetation. points of public pride and are 4. Evaluate views of Lake Union, 4. Use “visual friction,” like closer self-reinforcing. Lake Washington, the Cascade spacing of elements, to enhance Mountains, the Arboretum, awareness of changes in speed and and Mount Rainier, and approach to nearby intersections. provide opportunities to 5. Create safe and attractive transit enjoy similar views. facilities that address needs such as visual and physical access, and safe bicycle and pedestrian crossings. 6. Use natural features and plantings to screen views of the West Approach bridge from residences adjacent to Lake Washington Blvd. 7. Integrate utilities into the Montlake Lid structure in a way that minimizes distractions and visual clutter. 8. Address ventilation and fire life- safety needs in the comprehensive aesthetic design of Montlake Lid. MONTLAKE INTERCHANGE PRINCIPLES

1.See universal/corridor/area principles. 1.Conserve and replicate, where 1. Provide enhanced elements of 1. Ensure high quality craftsmanship, possible, the planted medians and safety like call boxes and tamper- especially along the pathway tree borders from the Olmsted proof lighting in tunnels to provide where people will have time to and UW plans. security for users. observe details and small features. 2. Create safe and attractive transit facilities that address needs such as visual and physical access, and safe bicycle and pedestrian crossings. 3. Use “visual friction,” like closer spacing of elements, to enhance awareness of changes in speed and approach to nearby intersections.

CRITERIA

CRITERIA CRITERIA CRITERIA CRITERIA

DRAFT August 2011 E N not to scale Yacht Club Yacht Queen City e

Fuhrman Ave E Delmar to Boyer Underbridge Area

Boyer Ave E

E Hamlin St Boyer Ave E Ave Boyer d East Lid Edge E Edgar St Bagley Viewpoint/ June 2012 DRAFT

Area Key Map

W 11th Ave E Ave 11th e S Delmar Dr E N O

I 10th Ave E Ave 10th

T Broadway Ave E Ave Broadway C E d N N O Park

Roanoke Harvard Ave E Ave Harvard CONNECTIONS C

Church 11th Ave E Ave 11th St. Patrick’s c Lid c

E Roanoke St 10th and Delmar

b E Mille a b

E Miller St Roanoke Area West Lid Edge

School

Seward

Federal Ave E Ave Federal Eastlake Ave E Ave Eastlake a I-5 Crossing 3 Rogers

Playground

10th Ave E Ave 10th E Design Subareas Design Subareas Portage Bay Bridge and West Approach Bridge

W

E b a Area Key Map b

c

2a b CONNECTIONSCONNECTIONS c Portage Bay Underbridge Areas West Approach Bridge Bridge

DRAFT June 2012 Design Subareas Montlake Area

W

E

Area Key Map e d c a b

1a b CONNECTIONS c d e East Lake Washington Shoreline East Montlake Park Canal Reserve Montlake Boulevard Boulevard and Lid Maintenance and Stormwater Facility East and Operations Facility

DRAFT June 2012