Cities,Councils, and Civic Leaders
- City of Glendale
- City of La Cañada Flintridge
- City of Los Angeles
- City of Pasadena (Western routes)
- Pasadena City Council – opposes 710 tunnel (April 13, 2015)
- City of Sierra Madre
- City of South Pasadena
- Crescenta Valley Town Council
- Congressman Adam Schiff
- State Senator Carol Liu
- Assemblymember Mike Gatto
- Assemblymember Anthony J. Portantino
Neighborhood Organizations
- Arroyo Seco Neighborhood Council
- Eagle Rock Neighborhood Council
- El Sereno Neighborhood Council
- Glassell Park Neighborhood Council
- Greater Cypress Park Neighborhood Council
- Historic Highland Park Neighborhood Council
- Lincoln Heights Neighborhood Council
- Sunland-Tujunga Neighborhood Council
- Far North Glendale Homeowners Association
- Glassell Park Improvements Association, Land Use Committee
- Glendale Homeowners Coordinating Council
- Linda Vista-Annandale Association
- Mount Washington Homeowner’s Alliance
- San Rafael Neighborhoods Association
- West Pasadena Residents’ Association
- Caltrans Tenants Association
- LA RED, El Sereno
- The Eagle Rock Association (TERA)
- Highland Park Heritage Trust
- La Canada Unified School District
- Pasadena-Foothills Association of Realtors
- Sequoya School
- Day One
- South Pasadena Chamber of Commerce
- Pasadena Roving Archers
Other Organizations
- Friends of the Earth, Taxpayers for Common Sense, the Heartland Institute, Environment America and Public Citizen in their Green Scissors Reports of 2010 and 2011
- California Public Interest Research Group
- Environment Defense Fund
- Natural Resources Defense Council
- Trust for Public Land