Project Opportunities

Sustainable Streets Typologies

The Master Plan uses a set of four “Sustainable Streets Typologies” to help identify opportunities to integrate green stormwater infrastructure with transportation improvements. These typologies help categorize and prioritize project opportunities and are characterized by different project drivers, geography, level of complexity, and cost. The typologies include:

  1. Sustainable Street Curb Extensions
  2. Sustainable Street Connectivity Improvements
  3. Sustainable Streetscape Redesign Projects
  4. Sustainable Street Frontage Improvements for New Developments

These typologies assist in linking project opportunities to relevant implementation mechanisms and funding sources. For example, Typologies 1-3 generally include projects funded through government sources, whereas projects that fall into Typology 4 could be funded by private developers. Different typologies may also need different policy mechanisms to facilitate implementation. The following table summarizes the characteristics of each typology, and the following sections provide additional information on the use of the typologies in the plan.

A major goal of the Master Plan was to identify and prioritize opportunities to integrate green infrastructure with transportation investments. Project opportunities were tiered based on the likelihood to integrate green infrastructure (i.e., projects not involving work on the curb and gutter area were ranked in a lower tier). New project opportunities at intersections near transit hubs and schools were also included in the set of sustainable streets opportunities. As shown in the flowchart above, the prioritization process followed a step-by-step evaluation of each project site in terms of water quality improvement, active transportation benefits, climate change resiliency, and helping communities that are likely to be disproportionately affected by the impacts of precipitation-based climate change.

Ranked opportunities were further vetted by local municipalities in terms of the likelihood to pair infrastructure investments, and projects were assigned implementation timelines to support the next phase of planning and funding efforts.

The Master Plan includes a parallel set of tools to advance implementation, including the development of model sustainable street policies and Conditions of Approval to help with establishing the institutional mechanisms for building sustainable streets through public and privately funded projects. Eleven project concepts, including examples from different typologies and different areas of the county, were created to support grant applications and community engagement.

The maps below show the identified projects (planned and new) for all project opportunities.

Existing Planned Project Opportunities

Three Project Typologies

  • Sustainable Street Curb Extensions
  • Sustainable Street Connectivity Improvements
  • Sustainable Streetscape Projects

Two Project Tiers

  • Tier 1 projects have more potential to cost-effectively incorporate green infrastructure due to the extent of construction impacts associated with those projects

“New” Project Opportunities


  • Support Safe Routes to School and Transit Program objectives
  • Support cost-sharing and construction impact reduction objectives by locating opportunities where pavement is in poor condition

New Curb Extension Opportunities:

  • Intersections within 0.5 mile walking distance from schools or major transit stops
  • Arterial or collector streets
  • Poor pavement condition

Project opportunities were first run through a set of stormwater technical suitability criteria to address the following stormwater benefits:

  • Ability to capture and store runoff
  • Help remove pollutants
  • Infiltrate stormwater into underlying soils
  • Sufficient space to install green infrastructure

Opportunities were also ranked based on the ability to address future climate change impacts related to projected increases in runoff depths on the roadway.

Co-benefit Criteria

A big emphasis of the Master Plan is to assist communities that could benefit most from the roadway improvements. For example, opportunities in communities with fewer resources to effectively adapt to future conditions (e.g., vulnerable communities), those in need of greening (e.g., high heat island index or poor canopy coverage), or those in need of enhanced transit options (e.g., low vehicle ownership areas) were ranked higher.