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Alternatives

Persistent congestion during AM/PM peak travel times is especially pronounced within the project limits. Project build alternatives seek to correct these conditions, improving overall circulation, safety, and the health of the region’s freeway network. The I-605 project proposes improvements for approximately 16 miles along the central most portions of the I-605 from approximately two miles south of the I-105 interchange to approximately two miles north of the I-10 Interchange; including the SR 60 from Santa Anita Avenue to east of Turnbull Canyon Road; and I-5 from Florence Avenue to the Rio Hondo Channel.

A range of project alternatives have been developed which identified locations and interchanges within the project area where improvements were necessary and feasible.  In general, all proposed build alternatives feature widening of the I-605 mainline freeway. Project alternatives include (see cross-sections, below):

> Alternative 1 (No Build): The No-Build Alternative would maintain the existing configuration of I-605 and would not result in improvements.

> Alternative 2: Alternative 2 proposes the addition of one new mixed-flow lane on both the northbound and southbound I-605 mainline (except between I-5 and 1-105), and the conversion of the existing HOV lane to an express lane.  The following additional peripheral improvements are also proposed with this build alternative:

  • Add a new general purpose/mixed-flow lane on westbound SR-60 from Hacienda Boulevard to the I-605/SR 60 system interchange
  • Add a new general purpose/mixed-flow lane on eastbound SR-60 from the I-605/SR 60 system interchange to 7th Avenue
  • Add a new HOV lane on northbound and southbound I-5 from Florence Avenue to Lakewood Bl
  • Add auxiliary lanes where necessary to enhance freeway operations
  • Reconfiguration of interchanges and modifications to local arterial streets to enhance freeway access
  • Add three HOV or ExpressLane direct connectors from north I-605 to west I-105, south I-605 to west I-105, and north I-605 to west I-10 with reverse movement for each

> Alternative 3: Alternative 3 proposes the addition of one new express lane on northbound and southbound I-605, and the conversion of the existing HOV lane to create a two-lane express facility within project limits.  The additional peripheral improvements as listed in Build Alternative 2 are also proposed with this alternative.

> Alternative 4: Alternative 4 proposes the addition of a second HOV Lane on northbound and southbound I-605 to create a two-lane HOV facility within project limits.  The additional peripheral improvements as listed in Build Alternative 2 are also proposed with this alternative.

Benefits

There are a number of additional corridor and local jurisdiction improvements that will benefit residents, businesses, travelers, and interstate commerce along the project corridor.

Proposed work to on- and off-ramps, bridges, underpasses, and local connecting roadways will greatly improve circulation on local streets and improve access to businesses and connections to nearby residential neighborhoods.

These include:

  • Reduction of average daily travel times on the I-605 from the I-105 to the I-10 by 23 to 50% depending upon the Preferred Alternative selected
  • Redesign and relocation of existing auxiliary merge and demerge locations to improve traffic flow, reduce and eliminate weaving, and create safer travel conditions
  • Improvements to interchange on- and off-ramp connections to provide safer ramp turns and speeds
  • Additional and upgraded existing intersections to increase traffic flow and safety
  • Work with local jurisdictions to update traffic synchronization and improve the efficiency and safety of local-freeway connections
  • Additional and improved standard bicycle lanes on local streets along the corridor to increase connectivity to the San Gabriel River trail
  • Reduction of the length of pedestrian/bicycle crossings to improve public safety and minimize potential auto related accidents
  • Enhanced pedestrian connections by adding new or upgrading existing sidewalks, pedestrian overcrossings, and pedestrian undercrossings in compliance with Americans with Disability Act standards
  • Improvements to equestrian crossings and enhance existing equestrian trails along the corridor
  • Upgraded and additional storm water treatment facilities to improve water quality and reduce trash entering local rivers and streams
  • Enhanced freeway driving experience through application of a corridor-wide Aesthetic Master Plan, which provides consistent structural and landscape beautification treatments
  • Construct more than 100 new and replaced soundwalls along the project freeway corridors to insulate local communities from on-going traffic and temporary construction noise

Local Improvements by Jurisdiction

The project area includes nine cities and a number of county island communities. The table below outlines the range of additional local improvements proposed for each jurisdiction. See the project improvement map for reference.

Benefits

There are a number of additional corridor and local jurisdiction improvements that will benefit residents, businesses, travelers, and interstate commerce along the project corridor.

These include:

  • Reduction of average daily travel times on the I-605 from the I-105 to the I-10 by 23 to 50% depending upon the Preferred Alternative selected
  • Redesign and relocation of existing auxiliary merge and demerge locations to improve traffic flow, reduce and eliminate weaving, and create safer travel conditions
  • Improvements to interchange on- and off-ramp connections to provide safer ramp turns and speeds
  • Additional and upgraded existing intersections to increase traffic flow and safety
  • Work with local jurisdictions to update traffic synchronization and improve the efficiency and safety of local-freeway connections
  • Additional and improved standard bicycle lanes on local streets along the corridor to increase connectivity to the San Gabriel River trail
  • Reduction of the length of pedestrian/bicycle crossings to improve public safety and minimize potential auto related accidents
  • Enhanced pedestrian connections by adding new or upgrading existing sidewalks, pedestrian overcrossings, and pedestrian undercrossings in compliance with Americans with Disability Act standards
  • Improvements to equestrian crossings and enhance existing equestrian trails along the corridor
  • Upgraded and additional storm water treatment facilities to improve water quality and reduce trash entering local rivers and streams
  • Enhanced freeway driving experience through application of a corridor-wide Aesthetic Master Plan, which provides consistent structural and landscape beautification treatments
  • Construct more than 100 new and replaced soundwalls along the project freeway corridors to insulate local communities from on-going traffic and temporary construction noise

Local Improvements by Jurisdiction

The project area includes nine cities and a number of county island communities. The table below outlines the range of additional local improvements proposed for each jurisdiction. See the project improvement map [JJ1] for reference.

Public Involvement

The public has multiple opportunities and avenues for involvement during the environmental phase, and is strongly encouraged to participate. A series of public meetings will be held in the study area to coincide with major project milestones. Public hearings will be held following circulation of the draft environmental documents.

Comments and questions can be submitted at the meetings, submitted via regular US mail, or shared by phone at 213-922-4091. Interested parties are also encouraged to stay connected by signing-up to receive project notifications.