Last updated on 08/05/2025
Channel Capacity
Levee evaluations for the SJRRP identify the need to remediate levees to convey Restoration Flows.
Channel Capacity Reports
Priority 1 and Priority 2 Levee Geotechnical Evaluations: The San Joaquin Levee Evaluation Project is being implemented by DWR to conduct geotechnical evaluations of the flood control system integrity associated with levee seepage and stability on high-priority levees in the Restoration Area. To limit the risk of levee failure due to the release of Restoration Flows, channel capacities are limited to flow levels that would meet the U.S. Army Corps of Engineers (USACE) factors of safety for levee slope stability and underseepage. If data on the levees is not available to evaluate seepage and stability conditions, flows are limited to those that would remain “in-channel” until adequate data are available. From the initial geotechnical analysis findings, high flood hazards were identified for most San Joaquin River Restoration Program (SJRRP) levees. DWR has prioritized its geotechnical exploration based on current channel capacity limitations and anticipated Restoration Flow routing.
Priority 1 levee evaluations in Reach 2A, the lower portion of Reach 4A, and the middle Eastside Bypass are complete. The results showed that only one levee segment in these reaches — 2 miles of the right back of the Eastside Bypass below Sand Slough — cannot convey at least 2,500 cfs without exceeding USACE criteria. The 2-mile segment of levee was identified for improvements and DWR completed a Basis of Design report for this levee segment in 2017; 95% designs were completed in 2018. The levee improvement project is scheduled for construction in 2019.
Geotechnical evaluations also continued on the Priority 2 levees, which include the Mariposa Bypass and Reach 4B2. Data was collected on these levee segments in 2016. Geotechnical evaluations on the levees were completed in 2018 and a Geotechnical Conditions Report will be released in 2019. The report will include remediation alternatives and cost estimates that will help the SJRRP determine the costs of improving these levees under the Reach 4B, Eastside Bypass, and Mariposa Bypass Channel and Structural Improvements Project.
2024 Channel Capacity Report
2023 Channel Capacity Report
2022 Channel Capacity Report
2021 Channel Capacity Report
2020 Channel Capacity Report
2019 Channel Capacity Report
2018 Channel Capacity Report
2017 Channel Capacity Report
2016 Channel Capacity Report
2015 Channel Capacity Report
2014 Channel Capacity Report
Subsidence Monitoring
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)
- December 2024 Table (xlsx, 0.2 MiB)
- December 2024 Map (pdf, 0 B)
- December 2024 ArcGIS Data (zip, 0.1 MiB)
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.