San Juan Creek Reports and Studies

Welcome to OC Watershed's Reports and Studies Section. We will continue to add to this section to keep you informed of activities and progress within the San Juan Creek Watershed.

If there are any questions regarding the details of a document, or to obtain a hard copy or other alternative formats of the original document, or to have a document read to you, please contact the OC Public Works offices: 2301 N. Glassell St., Orange, CA, 92865 Monday through Friday, 7:00 am to 5:00 pm PST, by email at OC Watersheds, or by phone at (714) 955-0600.

San Juan Watershed Management Plan:

San Juan Creek Watershed Management Study F5 Report:


Economic Appendix: Feasibility Phase

  1. Plate Oso 2
  2. Plates SJ1
  3. Plate SJ2
  4. Plates SJ3
  5. Plates TC1
  6. Plates TC2


  1. Sheet ER-01
  2. Sheet ER-02
  3. Sheet ER-03
  4. Sheet ER-04
  5. Sheet ER-05
  6. Sheet ER-06
  7. Sheet ER-07
  8. Sheet ER-08
  9. Sheet ER-09
  10. Sheet ER-10
  11. Sheet ER-11
  12. Sheet ER-12
  13. Sheet ER-13
  14. Sheet ER-14
  15. Sheet ER-15


  1. FC6 Sheets 01 09
  2. CS1 Sheets 01 13
  3. CS2 Sheets 01 08
  4. CS3 Sheets 01 08
  5. FC2 Sheets 01 12
  6. FC3 Sheets 01 15
  7. FC4 Sheets 01 14
  8. FC5 Sheets 01 17


San Juan Creek Watershed Bacterial Study - December 24, 2002:

Chapter 1

Chapter 2

Chapter 3

Bacteria Source Tracking Study

Watershed Workplans

The San Juan Creek Watershed Workplan (Workplan) identifies the management activities being undertaken by the Cities of Dana Point, Laguna Hills, Laguna Niguel, Mission Viejo, Rancho Santa Margarita, and San Juan Capistrano, the County of Orange, and the Orange County Flood Control District (the San Juan Creek Watershed Permittees) to address priority water quality constituents of concern in the creeks and streams of the San Juan Creek watershed. The Workplan is updated annually.

The purpose of the Workplan is to: 

  1. Characterize the receiving water quality in the watershed. 
  2. Identify the highest priority water quality problem(s) in terms of constituents by location in the watershed’s receiving waters. 
  3. Identify the sources of the highest water quality problem(s) within the watershed. 
  4. Present a watershed BMP implementation strategy to attain receiving water quality objectives in the identified highest priority water quality problem(s). BMPs are defined as schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent, eliminate, or reduce the pollution of waters of the receiving waters. BMPs also include treatment requirements, operating procedures, and practices to control plant site runoff spillage or leaks, sludge or waste disposal, or drainage from raw material storage. 
  5. Present a strategy to model and monitor improvements in receiving water quality directly resulting from implementation of the BMPs described in this Workplan.