Tuesday, May. 28, 2024
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Madera Subbasin and Joint GSP

The Madera Subbasin exists within the larger San Joaquin Valley Groundwater basin described in the California Department of Water Resources Bulletin 118. There are multiple GSAs within the Madera Subbasin, including the Madera County GSA for “white areas,” City of Madera GSA, Madera Irrigation District, Root Creek Water District, Madera Water District, Gravelly Ford Water District, New Stone Water District. There are four separate GSPs, including the Joint GSP, which represents approximately 95% of the acreage within the Madera Subbasin. If you’re not sure what GSA you are in for the Madera Subbasin, use this interactive map.

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2023 March Revised Madera Subbasin Joint GSP

Approval Letter for the Madera Subbasin GSP
Madera Subbasin GSP Draft Tracked Changes March 2023
All Figures Referenced in ISW Section 3/2/2023
Chapter 2 Figures 2023
Chapter 3 Figures 2023
Appendix 1J Revised First Amendment to the Madera Subbasin Coordination Agreement 3-20-2023
Appendix 2G Madera Subbasin Domestic Well Inventory TM April 2022
Appendix 3A DRAFT Madera RMS WY 2021 Update 1-18-2023 REDUCED
Appendix 3D Economic Analysis and Framework for Potential Domestic Well Mitigation Program
Appendix 3E DRAFT Madera Subbasin Domestic Well Mitigation Program MOU 3-5-2023
Appendix 3G Madera Infrastructure Assessment Draft 2/22/2023
Appendix 3H Subsidence Workplan 3/20/2023
Appendix 3I ISW Workplan 3/20/2023
Appendix 5A Revised DRAFT Madera Subbasin Update Timeline 2-9-2023

2020 January Madera Subbasin Joint GSP

Madera GSP Final Report
List of Comments
Chapter 2 Figures
Chapter 3 Figures
Appendix 1 A-I
Appendix 2 A-B
Appendix 2 C.a
Appendix 2 C.b-C.e
Appendix 2 D
Appendix 2 E.a
Appendix 2 E.b
Appendix 2 E.c
Appendix 2 F
Appendix 3 A-F
Appendix 4 A
Appendix 5
Appendix 6 A-D
Appendix 6 D Groundwater Model Report Appendices
Appendix 6 D Groundwater Report Figures

Madera Subbasin Joint GSP Annual Reports

Madera Joint GSP Annual Report WY 2023 April 2024
Madera Subbasin Annual Report April 2023
Appendices A-B
Appendices C-1
Appendices C-2
Appendices C-3
Appendices C-4
Appendices D
Appendices E-F
Appendices G-H
Madera GSP Annual Report April 2022
Madera Subbasin Annual Report April 2021- Updated; Appendices
Madera Subbasin Annual Report April 2021; Appendices
Madera Subbasin First Annual Report April 2020; Appendices


Madera Subbasin Coordination Work Group (2021 +)

County GSA: Brett Frazier and Stephanie Anagnoson (alternate)
City GSA: Keith Helmuth and Keith Helmuth’s designee (alternate)
Madera Irrigation District: MID Groundwater Committee Chair and General Manager of MID or his designee (alternate)
Root Creek Water District: Julia Berry and Brian Ehlers (alternate)
Gravelly Ford Water District: Don Roberts and Garth Peccenino (alternate)
Madera Water District: Phil Janzen and Kevin Herman (alternate)
New Stone Water District

Madera Subbasin Joint GSP Coordination Committee (2018-2020)

County: Brett Frazier and Greg Young
Madera Irrigation District: Dave Loquaci and Dina Nolan
Madera Water District: Phil Janzen and Eric Abrahamsen
City of Madera: Derek Robinson and Keith Helmuth


Madera Subbasin Joint GSP Meetings (Coordination and Technical)

February 7, 2019 – Madera & Chowchilla Subbasin Joint Meeting Agenda. Flyer in English. Flyer in Spanish. Minutes
March 21, 2019 – Madera Subbasin Coordination Meeting SWRCB Presentation; Coordination Committee Presentation; Agenda; Minutes
April 25, 2019 – Public Technical Workshop, Agenda; Presentation; Minutes
May 29, 2019 – Public Technical Workshop  Agenda. GSP Preparation; Minutes
August 7, 2019 Public Technical Workshop Agenda; Presentation; Minutes
October 22, 2019 Madera Subbasin GSP Presentation;  Agenda
December 2, 2019 Coordination Committee Meeting Presentation; Agenda


Grant-Funded Madera Subbasin Information

Madera Subbasin Data Collection and Analysis w/ Tables and Figures
Madera Subbasin Data Collection and Analysis Appendices
Madera Subbasin Preliminary Water Budget Analysis