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Boulder's New Multimodal Zone08-19-20 | Feature

Boulder's New Multimodal Zone

Boulder, Colorado
by Carol Adams, ASLA, PLA, StudioTerra

The Pearl Parkway "Multi-Way Boulevard" in Boulder, Colorado is an innovative street section that allows for multi-family housing to be located on what was once a too busy thoroughfare but is now calmed by the wide multi-use paths, access lanes, and parking. StudioTerra provided conceptual, landscape and hardscape design through construction documentation and administration. Photo Credit Landscape Forms
This aerial view shows the Depot Square and the Junction Place shared street. The plaza is made of permeable pavers and the pattern extends across the street to create a cohesive space that prioritizes the pedestrian. All lighting is dark sky compliant with lighted bollards and streetlights. StudioTerra was the lead consultant on the Public Art Master Plan, which led to the inclusion of the sculptural light trees placed throughout the area. Photo Credit Landscape Forms
A speed reducing median in Junction Place marks the entry into the shared street. The light trees sculpted by Joshua Weiner are made of eight, 20-foot by 20-foot aluminum rings. Photo Credit Landscape Forms
Aerial view of a well-lit Pearl Parkway, highlighting the through lanes in the center, and the residential access lanes and parking to either side. The wide sidewalks also serve as multi-use paths for both cyclists and pedestrians. Photo Credit Landscape Forms
Looking south on Junction Place and showing the Junction Place bridge over Goose Creek, the use of the same paving materials and site furnishings across the bridge create a seamless streetscape that prioritizes the pedestrian. Photo Credit Tsiouvaras Simmons Holderness, Inc.
Installing a modular suspended pavement system for the trees along Pearl Parkway created enormous soil volume, an average of 430 feet cubed per tree, and allowed a healthy environment for the trees to thrive. Mostly installed in a two-layer system on both sides of the parkway, 1,249 frames and 684 decks were installed for 29 trees, enhancing the ground floor presence without impacting the paved area. Photo Credit Tsiouvaras Simmons Holderness, Inc.
StudioTerra was also the landscape architect for the new mixed-use housing developments that brought about a need for on-street parking for residents and shoppers. Permeable pavers were used with a herringbone pattern continued throughout the area unifying the design. Photo Credit Tsiouvaras Simmons Holderness, Inc.
View of the newly constructed Pearl Parkway segment, highlighting the paving patterns used on the residential access lanes, street parking, and multi-use path. All new plants were brought in including 29 trees along the walkways and drip line irrigation was used due to the dry Colorado climate. Photo Credit Tsiouvaras Simmons Holderness, Inc.
The historic Boulder Train Depot was relocated to Depot Square and repurposed into a popular restaurant for residents and visitors. All area lighting is LED and dark sky compliant. Individual wireless control devices allow the city to manipulate the lights. Photo Credit: Landscape Forms

The city of Boulder, Colorado, is a compact college town with approximately 100,000 residents and a long history of innovative transportation improvements that focus on pedestrian and bicycle connections and safety. The developing area around the city's historic railroad, formerly known as Transit Village, became a model of the city's innovative approach to transportation projects when in 2007, the city adopted an implementation plan that would turn the light industrial area into a livable, walkable neighborhood with a mix of uses. StudioTerra, having held a long history with the area, was the landscape architect for the project, providing conceptual, landscape and hardscape design through construction documentation and administration. The goal of the plan was to create a well-used and well-loved pedestrian oriented place, provide convenient and safe pedestrian and bicycle connections and create a variety of community gathering spaces. The project consisted of two main components which focused on multimodal connections in an environment where people are the priority.

Pearl Parkway Multi-Use Boulevard
Pearl Parkway, a high capacity arterial that carried traffic coming into Boulder from the east, underwent zoning changes that allowed for multi-family housing on the street, something that had never been done before in that area. Through this project, the arterial was re-envisioned as a tree-lined, multi-use boulevard, creating a high capacity thoroughfare in the center with slow, local pedestrian and bicycle focused spaces on either side. These spaces serve the newly developed residential projects on either side of the boulevard. On-street parking was desired for the units and wide paths made the street more friendly for pedestrians and residents while allowing for more bicycle traffic resulting in a key, multi-use path.

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The objections of the multi-way boulevard were to accommodate all modes of travel, minimize stormwater runoff by maximizing permeable surfaces, create an environment for street trees to thrive through the provision of high volumes of soil for each tree and create a pedestrian friendly area with specific designs to ensure slow speeds for cars and bikes.

"Through traffic could remain through and not be impeded while a much quieter situation could occur on the side that would be conducive to mixed use development, shopping, housing and also accommodate all the pedestrians and bikes."
- Carol Adams, ASLA, PLA - Principal, StudioTerra


Much of the pedestrian and bike area uses a variety of bricks including heavy duty for vehicular areas, permeable wherever possible and standard where permeable are not appropriate. To create a cohesive and unified look, the same material was pulled into the area from Boulder's downtown, pedestrian Pearl Street Mall, a well-known, brick mall. A suspended pavement was installed along Pearl Parkway creating enormous soil volume for the future street trees, mitigating the effects of the surrounding pavement and creating a healthy environment for the trees to thrive.

Junction Place Shared Street
Perpendicular to and intersecting with Pearl Parkway is Junction Place - the city's first shared street. This innovative street relegates first priority to the pedestrian and invites cars in at very low speeds. The street incorporates the same family of site furnishings and bricks - but in a different pattern to suggest a large public outdoor gathering area - including the drivable portion with permeable pavers used throughout the site.

"It became a place where cars are invited in but they aren't the primary user and you really feel as you're driving in, that you're entering a pedestrian space." - Carol Adams, ASLA, PLA

Depot Square, part of the Junction Place shared street, includes a new underground Regional Transportation District bus station and parking structure with a public plaza, affordable housing complex, hotel and restaurant above, located at grade. Originally the historic Boulder Train Depot that once sat in central Boulder, the depot was preserved and relocated, later being moved and repurposed to the popular Depot Square plaza restaurant. Ample seating, lighting and public art enhance the space into a pedestrian oriented, mixed-use public area.

As seen in LASN magazine, August 2020.

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