Coso Operating Company/Hay Ranch Hydrologic Monitoring

Data contained herein are preliminary and subject to revision.

Environmental Impact Report Documents

• • Overview Map of Rose Valley Hydrologic Monitoring Points (2011)
  • Hydrologic Monitoring and Mitigation Plan(Dec 2008)
  • Final EIR December 2008 (Large File)
  • Draft EIR July 2008 (Large File)

Monthly Monitoring Reports

• • • Pressure Transducer Hydrographs (updated monthly)
    • Manual GWE Hydrographs(updated monthly)
    • Flow Hydrographs (updated monthly)
    • Hay Ranch Pumping (to date)

EIR/HMMP Updates

Hay Ranch CUP Modeling & Pumping Update (2-24-22)

• •   Letter to Coso Operating Company extending pumping period   (May 28, 2021)
  •   Revised Groundwater Flow Model and Predictive Simulation Results (May 27, 2021)
  •   Conditional Use Permit #2007-03/Coso Extension of Pumping (November 27, 2018)
  •  Letter to Coso Operating Company extending pumping period   (July 27, 2017)
  •   Revised Groundwater Flow Model and Predictive Simulation Results (August 24, 2017)
  •   Letter to Coso Operating Company extending pumping period (August 30, 2013)
  •   Revised Groundwater Flow Model and Predictive Simulation Results (January 28, 2011)
  •   ICWD Addendum to Hay Ranch CUP HMMP (April 1, 2011)

Quarterly Monitoring Reports

2024	Spring Summer Fall	2023	Spring Summer Fall Winter	2022	Spring Summer Fall Winter
2021	Spring Summer Fall Winter	2020	Spring Summer Fall Winter	2019	Spring Summer Fall Winter
2018	Spring Summer Fall Winter	2017	Spring Summer Fall Winter	2016	Spring Summer Fall Winter
2015	Spring Summer Fall Winter	2014	Spring Summer Fall Winter	2013	Spring Summer Fall Winter
2012	Spring Summer Fall Winter	2011	Winter Fall Summer Spring	2010	Winter Fall Summer Spring

2024 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November

2023 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2022 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2021 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2020 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2019 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2018 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2017 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2016 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2015 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2014 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2013 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2012 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2011 Monthly Monitoring Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2010 Monthly Monitoring  Reports

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

2009 Monthly Monitoring Reports

• July
• August
• September
• October
• November
• December

For more information about the Coso/Hay Ranch water monitoring program,
please contact the Inyo County Water Department at 760.878.0001.