Rio Hondo LRS Implementation Project


The County of Los Angeles, in partnership with the Cities of Alhambra, Monterey Park, Pasadena, Rosemead, San Gabriel, San Marino, South Pasadena, and Temple City are finalizing a project concept for the Rio Hondo LRS Implementation Project. This project would divert and treat dry-weather flows from a 35,000-acre tributary area in the Rio Hondo watershed. This includes the installation of three treat-and-release UV systems at the individual confluences prior to entering the Rio Hondo Channel.

Status: Design
Cost: $5,144,400 (Alhambra Wash); $3,458,500 (Eaton Wash); $5,624,200 (Rubio Wash)
Funding: Pursuing Safe Clean Water – Measure W (Regional)
Agency Lead: County of Los Angeles
Footprint: N/A – diversion structures
Drainage Area: 35,000 acres
Volume Capture: N/A
Implemented Control Measures: Treatand-release systems (UV)
Key Benefits: Water quality, dry weather treatment