Landscape Architecture

Landscape Architecture

Landscape Architecture

Landscape Architecture


← Back to 21st Street Green and Complete Street Improvements


Historic runoff from the Mountain Springs Creek watershed along with subsequent development of the urban areas over the course of several decades has resulted in frequent flooding, poor pavement, and inadequate facilities for bicycles and pedestrian traffic. To improve the situation, The City of Paso Robles in partnership with the Central Coast Low Impact Development (LID) Initiative and SvR Design Company (SvR) developed a conceptual design for a green/complete street and stormwater enhancement project along 21st Street between Vine Street and Riverside Avenue. Cannon was selected to complete the design and implementation of the project. Goals for the project are to reduce the frequency and severity of street flooding, increase groundwater recharge, improve the quality of stormwater runoff reaching the Salinas River, sediment removal, reduction of traffic speeds with traffic calming devices, shade the street with trees, re-map the 100-year corridor, promote infill and redevelopment, and provide Class II bike lanes. This project is the first of its kind in San Luis Obispo County.

Implementation of the “green street” stormwater management and “complete street” traffic calming goals are critical. Street improvements include: stormwater bio-retention areas; daylighted creek channel; storm drain pipes/culverts; energy dissipation feature; replacement of an aging sewer line; waterline reconstruction; traffic calming for pedestrian and bicycle safety improvements, coordination and installation of a new pedestrian crossing within the railroad right-of-way; intersection bulb-outs for reduced pedestrian crossing widths; flashing LED crosswalks; street furnishings; ornamental street lighting; repaving with conventional and pervious pavement/paver systems; engineered soil mixes and open channel plantings; and street trees.

Cannon’s scope of work included preliminary and final design; railroad right-of-way coordination; subconsultant coordination; preparation of plans, specifications, and construction estimate; and presentation of exhibits for public outreach. Cannon also collaborated with the City, Arborist, and Geotechnical Engineer in completing the final design for this green/complete street project.

Project Awards
  • AWWA Sustainable Water Management Conference, Portland, Oregon
  • AWWA Whole Water Conference, Monterey, California
  • ASCE International Sustainability Conference, Newport Beach, California
  • LIDI Low Impact Development Construction Management Workshop, San Luis Obispo, California
  • CWEA One Water Annual Conference, Santa Clara, California

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Paso Robles, California

Landscape Architecture