Bottom-Up Local Input and Envisioning Process

In preparation for adoption of Southern California’s next Regional Transportation Plan and Sustainable Communities Strategy (RTP/SCS) in spring 2020, SCAG will be engaging with local jurisdictions, subregions, and other stakeholders to inform development of the upcoming Plan. SCAG’s Bottom-Up Local Input and Envisioning Process is being conducted to solicit feedback from local jurisdictions on base land use, anticipated population/household/employment growth, resource areas, sustainability practices, and local transit-supportive measures to help decision makers understand how the region will perform under current circumstances in future years.

This information will then be used to develop potential scenarios for the 2020 RTP/SCS, through a structured and collaborative engagement with local jurisdictions, county transportation commissions, a broad range of stakeholder groups, and the general public. Input from jurisdictions on locally anticipated household and population growth will also be used by SCAG as part of the regional housing need determination process with the California Department of Housing and Community Development (HCD).

For ease of review, core data items have been mapped in draft format and assembled in an individual map book for each local jurisdiction (available below). County-level maps showing the first draft of anticipated growth are also accessible for review.

Draft Data/Map Books

To request draft high-quality maps and shapefiles of SCAG’s Data/Map Book or related materials, please contact

Please note that SCAG’s draft data is undergoing refinement based on feedback from local jurisdictions, and material included here is subject to revision; inquiries for official data should be directed to each respective local jurisdiction.



On October 31, 2017, SCAG held a regional training on the Bottom-Up Local Input and Envisioning Process to help local jurisdictions and other stakeholders understand how this early stage of data refinement will impact the RTP/SCS and Regional Housing Needs Assessment (RHNA).

Watch the Video​​​​​​​


Regional Housing Needs Assessment

Image: Transit-Oriened Housing 

The Regional Housing Needs Assessment (RHNA) is mandated by State Housing Law as part of the periodic process of updating local housing elements of the General Plan.

View the Factsheet​​​​​​​


Bottom-Up Local Input & Envisioning Process

Image: Group Collaborating 

SCAG will engage with jurisdictions one-on-one to establish a regional profile of base land use, population, household and employment growth, resource areas, sustainability practices, and local transit-supportive plans and policies.

More Information​​​​​​​

For additional information on this process, including a detailed work plan, please contact SCAG staff at