Programs & Projects

The Aliso Creek Watershed is largely developed, with the exception of the Cleveland National Forest in the upper watershed and the Aliso Wood Canyon Regional Park in the lower watershed. The approximately 35-square-mile watershed includes portions of the cities of Aliso Viejo, Dana Point, Laguna Beach, Laguna Hills, Laguna Niguel, Laguna Woods, Lake Forest, and Mission Viejo. Major transportation arterials through the watershed include the San Joaquin Hills Transportation Corridor and Interstate 5. The Watershed Permittees include the County of Orange, the cities of Aliso Viejo, Dana Point, Laguna Beach, Laguna Hills, Laguna Niguel, Laguna Woods, Lake Forest, and Mission Viejo and the Orange County Flood Control District.

Watershed Programs

More than a decade ago, the Watershed Permittees recognized that Aliso Creek and the beach at the creek mouth were suffering from a variety of water-resource-related problems and began an unprecedented program of collaboration to address these problems. 

Bacteria TMDL Program


Aliso Creek Total Maximum Daily Load (TMDL) for Bacteria was issued in 2001. Click here for more information. 
Integrated Regional Watershed Management Program

The Aliso Creek watershed is part of the South Orange County Watershed Management Area (WMA). The County of Orange, cities, water and wastewater agencies of South Orange County formed the South Orange County IRWM Group in 2004 and subsequently developed and adopted the South Orange County IRWM Plan. The IRWM Group established the South Orange County IRWM region as a cooperative framework for planning and implementing water management strategies in the region to improve water quality, integrate flood management, increase water supply and reliability and restore natural resources. 

Watershed Chapter

The Aliso Creek Watershed Chapter presents a planning framework to identify the most significant water quality issues related to urban runoff sources that can addressed at a multi-jurisdictional watershed-scale, to focus jurisdictional pollution prevention and source control programs on local constituents of concern, to identify treatment control opportunities, to incorporate prior data from planning studies, to identify indicators to track progress, and ultimately to develop an integrated plan of action that results in meaningful water quality improvement in the Aliso Creek Watershed. 

Water Quality Data Assessments - Annual Reports

Watershed Program Review


Workplans

Historical Aliso Creek Watershed data reports can be found through the OC Watersheds Document Library. Note that from 2001-2005 data analysis was included as part of Aliso Creek 13225 Directive quarterly progress reports (No. 1-18). In the fall of 2005 analysis was reduced to annual reports which were incorporated into Section D-2 of the Aliso Creek Watershed Action Plan reports (2005-2006, 2006-2007, 2007-2008, 2008-2009). Since 2010 the data analysis reports have been published separately and the watershed action plans were revised to watershed workplans. 


Watershed Projects


The Aliso Creek watershed is currently adversely impacted from a variety of water resources and related land resource problems. Most of these are related to widespread changes in the watershed, including changes in the hydrologic regime, channel instability, habitat loss, ecosystem degradation, and decline in water quality.

Aliso Creek Mainstem Ecosystem Restoration Project

Aliso Creek Mainstem Ecosytem Restoration Project was conducted in coordination with the U.S. Army Corps of Engineers to evaluate opportunities for restoring degraded ecosystem function and stream channel stability in the Aliso Creek mainstem watershed. 

Stakeholder Meetings
Aliso Creek Stakeholder Meeting Presentations:

Aliso Creek Feasibility Scoping Documentation:

Aliso Creek Feasibility Scoping Documentation Volume 1 (This document is 47 mb and will take time to download.) 
For your convenience the documents are also available in separate sections below: 
Volume 1: 

Aliso Creek Feasibility Scoping Documentation Volume 2 (This document is 47 mb and will take time to download.) 
For your convenience the documents are also available in separate sections below: 
Volume 2: