Reclamation surveys a network of over 70 control points across the San Joaquin Valley in July and December of each year to monitor ongoing subsidence. Following are the bi-annual survey result tables, maps, and ArcGIS shapefiles. Section 8 of the original control network report, below, includes a description of the control points, locations, and photos. All elevations are in GEOID 03, NAVD 88, and the horizontal datum is NAD 1983, California Coordinate System of 1983, Zone 4, US survey feet. Free or minimally constrained adjustment elevations should be used as they better represent control point movement by removing adjustment distortion.
- December 2011 Geodetic Network Report: Control Network Report (pdf, 0.2 MiB)
December 2011 Geodetic Network Report: Section 1: Map (pdf, 30 KiB)
December 2011 Geodetic Network Report: Section 2: Minimally Constrained Adjustment (pdf, 0.3 MiB)
December 2011 Geodetic Network Report: Section 3: Fully Constrained Network Adjustment (pdf, 0.3 MiB)
December 2011 Geodetic Network Report: Section 4: Total Station Observation Data (pdf, 0.1 MiB)
December 2011 Geodetic Network Report: Section 5: Raw Digital Level Data (pdf, 0.1 MiB)
December 2011 Geodetic Network Report: Section 6: Digital Level Adjustment (pdf, 96 KiB)
December 2011 Geodetic Network Report: Section 7: Adjusted Coordinate Table (pdf, 0.1 MiB)
December 2011 Geodetic Network Report: Section 8: Control Point Information Sheets (pdf, 23.9 MiB)
July 2012: Section 1: Subsidence Maps – Data from Others (pdf, 2.1 MiB)
July 2012 Transmittal Memorandum (pdf, 55 KiB)
July 2012: Section 3: Arroyo Canal Monitoring (pdf, 12 KiB)
July 2012: Section 2: Highway 152 Subsidence (pdf, 0.4 MiB)
July 2012: Section 5: Arroyo and Temple Canal Point Map (pdf, 0.5 MiB)
July 2012: Section 4: Temple Canal Monitoring (pdf, 10 KiB)
July 2012: Section 6: Network Elevation Comparison Table (pdf, 78 KiB)
July 2012: Section 7: Subsidence Map (pdf, 1.5 MiB)
July 2012: ArcGIS Data (zip) (zip, 9.0 MiB)
December 2012 Table (xlsx) (xlsx, 22 KiB)
December 2012 Map (pdf, 1.6 MiB)
December 2012 Table (pdf, 71 KiB)
July 2013 Map (pdf, 2.4 MiB)
July 2013 Inset Map (pdf, 1.5 MiB)
July 2013 Arroyo Canal Profile Map (pdf, 0.7 MiB)
December 2013 Table (pdf, 95 KiB)
December 2013 Map (pdf, 2.0 MiB)
July 2014 Map (pdf, 3.0 MiB)
July 2014 Table (pdf, 85 KiB)
July 2014 Table (xlsx) (xlsx, 43 KiB)
September 2014 – Subsidence Monitoring Technical Memorandum (pdf, 3.8 MiB)
December 2014 Table (xlsx) (xlsx, 48 KiB)
December 2014 Map (pdf, 2.5 MiB)
December 2014 Table (pdf, 0.1 MiB)
July 2015 Table (xlsx) (xlsx, 58 KiB)
July 2015 Table (pdf, 91 KiB)
July 2015 Map (pdf, 1.1 MiB)
July 2015 ArcGIS Data (zip, 74 KiB)
December 2015 Table (xlsx) (xlsx, 63 KiB)
December 2015 Map (pdf, 1.1 MiB)
December 2015 ArcGIS Data (zip, 50 KiB)
July 2016 ArcGIS Data (zip, 8.2 MiB)
July 2016 Table (xlsx) (xlsx, 64 KiB)
July 2016 Map (pdf, 1.6 MiB)
December 2016 Table (xlsx) (xlsx, 67 KiB)
December 2016 Map (pdf, 3.5 MiB)
December 2016 ArcGIS Data (zip, 0.2 MiB)
February 2017- DMC Subsidence map (, 1.1 MiB)
February 2017 - FKC 2017 Subsidence (xlsx, 19 KiB)
February 2017 - FKC Subsidence (pdf, 85 KiB)
February 2017 - DMC Subsidence Surveys (, 0.3 MiB)
July 2017 Table (xlsx) (xlsx, 70 KiB)
July 2017 Map (pdf, 1.0 MiB)
July 2017 ArcGIS Data (zip, 58 KiB)
December 2017 Table (xlsx) (xlsx, 74 KiB)
December 2017 Map (pdf, 4.6 MiB)
December 2017 ArcGIS Data (zip, 95 KiB)
July 2018 Table (xlsx, 78 KiB)
July 2018 Map (pdf, 0 B)
July 2018 ArcGIS Data (zip, 0.1 MiB)
December 2018 Table (xlsx, 83 KiB)
December 2018 Map (pdf, 0 B)
December 2018 ArcGIS Data (zip, 21 KiB)
July 2019 Table (xlsx, 88 KiB)
July 2019 Map (pdf, 0 B)
July 2019 ArcGIS Data (zip, 96 KiB)
December 2019 Table (xlsx) (xlsx, 92 KiB)
December 2019 Map (pdf, 0 B)
December 2019 ArcGIS Data (zip, 0.1 MiB)
December 2020 Table (xlsx, 0.1 MiB)
December 2020 Map (pdf, 0 B)
December 2020 ArcGIS Data (zip, 34 KiB)
July 2021 Table (xlsx, 0.1 MiB)
July 2021 Map (pdf, 0 B)
July 2021 ArcGIS Data (zip, 40 KiB)
December 2021 Table (xlsx, 0.1 MiB)
December 2021 Map (pdf, 0 B)
December 2021 ArcGIS Data (zip, 0.1 MiB)
July 2022 Table (xlsx, 0.1 MiB)
July 2022 Map (pdf, 0 B)
July 2022 ArcGIS Data (zip, 39 KiB)
December 2022 Table (xlsx, 0.1 MiB)
December 2022 Map (pdf, 0 B)
December 2022 ArcGIS Data (zip, 36 KiB)
July 2023 Table (xlsx, 0.1 MiB)
July 2023 Map (pdf, 0 B)
July 2023 ArcGIS Data (zip, 30 KiB)
December 2023 Table (xlsx, 0.1 MiB)
December 2023 Map (pdf, 0 B)
December 2023 ArcGIS Data (zip, 95 KiB)
July 2024 Table (xlsx, 0.2 MiB)
July 2024 Map (pdf, 0 B)
July 2024 ArcGIS Data (zip, 9 KiB)
The California Department of Water Resources has also performed subsidence monitoring along the Lower San Joaquin Flood Control Project levees. This work was combined with Reclamation’s survey network into a subsidence monitoring methodology and status technical memorandum in 2014.
USGS San Joaquin Valley Subsidence Website – The United States Geologic Survey has done monitoring with InSAR and several extensometers.