Reach 4B and Eastside Bypass

Reach 4B of the San Joaquin River is a 32.5-mile stretch that begins at the Sand Slough Control Structure and extends to the confluence of the Eastside Bypass and San Joaquin. Reach 4B has been further divided into two subreaches; Reach 4B1 from the Sand Slough Control Structure to the Mariposa Bypass, and Reach 4B2 from the Mariposa Bypass to the confluence of the Eastside Bypass and the San Joaquin River.

Reach 4B and Eastside Bypass project consists of incorporating new floodplain and related riparian habitat to ensure conveyance of at least 4,500 cfs through Reach 4B, modifications to ensure fish passage, and modifications in the Eastside and Mariposa bypass channels to support anadromous fish migration.

The Eastside Bypass Improvements Project Initial Study/Final Environmental Assessment consists of the December 2017 Draft IS/EA (Part 1, Part 2, Part 3, Part 4), the Finding of No Significant Impact and Air Quality and Greenhouse Gas Emissions; Biological Resources (Appendices A and B); public comments received (Appendix C); responses to public comments and minor text changes to the EA/IS (Appendix D); Endangered Species Act compliance documentation (Appendix E); and, National Historic Preservation Act Section 106 compliance documentation (Appendix F).

The Draft Technical Summary Report was prepared by the San Joaquin River Restoration Program Team to document technical studies completed as part of the Reach 4B, Eastside Bypass, and Mariposa Bypass Channel and Structural Improvements. Studies in this area started in 2009; this Technical Summary Report documents key technical findings and summarizes the work that led to these findings. The report describes the differences between the routes for high flows through this area and compares these routes. Finally, it identifies potential near-term actions (in addition to the Eastside Bypass Improvements Project) that could provide benefits regardless of the high flow alternative selected. Appendices for this draft technical report include Timing of Flow Analysis (A); Hydraulic and Sediment Studies ( B, Parts 1, 2, 3, 4, 5); Vegetation and Wildlife (C); Soils (D); Wetland Offset (E); Groundwater Analysis (F); Fisheries (G); and, Cultural Resources (H).

In September 2019, the lower weir on the Merced National Wildlife Refuge has been removed as part of the San Joaquin River Restoration Program’s Eastside Bypass Improvements Project.  The weirs, which were constructed to create seasonal pools for migratory birds on the Refuge, were a partial barrier to adult Chinook salmon and many other native fish. The upper weir will be removed in 2020 and, together, the removals will improve fish passage in the Eastside Bypass.  The San Joaquin River Restoration Program has coordinated with the Refuge to provide an alternate water supply to Refuge wetlands.

Below, a time-lapse video shows removal of the lower weir.

NameCategoryDateYearKindSizeTags
2018 Reach 4B Technical Summary ReportReach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix B Hydraulic And Sediment Studies For Reach 4b Part5Reach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix B Hydraulic And Sediment Studies For Reach 4b Part4Reach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix B Hydraulic And Sediment Studies For Reach 4b Part3Reach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix B Hydraulic And Sediment Studies For Reach 4b Part2Reach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix B Hydraulic And Sediment Studies For Reach 4b Part1Reach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix H Cultural ResourcesReach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix G FisheriesReach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix F Groundwater AnalysisReach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix E Wetland OffsetReach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix D SJRRP Reach 4B And ESB Soils Report 2018Reach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix C Vegetation And WildlifeReach 4BJuly 11, 2019pdf0 B
Draft Reach 4B Technical Summary Report Appendix A Timing Of Flow AnalysisReach 4BJuly 11, 2019pdf0 B
EBIP IS-EA Final FONSIReach 4BMay 29, 2018pdf0.3 MiB
EBIP IS-EA Appendix F, Section 106 Compliance DocReach 4BMay 29, 2018pdf0.2 MiB
EBIP IS-EA Appendix E, ESA Compliance DocReach 4BMay 29, 2018pdf5.3 MiB
EBIP IS-EA Appendix D, EBIP Final EA-RTC And ErrataReach 4BMay 29, 2018pdf0.2 MiB
EBIP IS-EA Appendix C, Public Comments ReceivedReach 4BMay 29, 2018pdf13.9 MiB
EBIP IS-EA Appendicies A & BReach 4BMay 29, 2018pdf4.2 MiB
EBIP IS-EA Public Draft 120617 Part4Reach 4BMay 29, 2018pdf0.4 MiB
EBIP IS-EA Public Draft 120617 Part3Reach 4BMay 29, 2018pdf6.5 MiB
EBIP IS-EA Public Draft 120617 Part2Reach 4BMay 29, 2018pdf6.5 MiB
EBIP IS-EA Public Draft 120617 Part1Reach 4BMay 29, 2018pdf6.2 MiB
SJRRP Eastside Bypass EA-IS Extended Comment PeriodNews ReleasesJanuary 5, 2018pdf0.2 MiB
SJRRP Eastside Bypass Draft EA-IS ReleasedNews ReleasesDecember 28, 2017pdf0.2 MiB
R4BFinalNOP090309Reach 4BJuly 6, 20172009pdf0.9 MiB
Federal Register/Vol. 74, No. 173/Wednesday, September 9, 200946453 /NoticesReach 4BJuly 6, 20172009pdf54 KiB
NOP20101122Reach 4BJuly 6, 20172010pdf0.4 MiB
Federal Register/Vol. 75, No. 224/Monday, November 22, 201071145 /NoticesReach 4BJuly 6, 20172010pdf61 KiB
Reach 4B, Eastside Bypass, andReach 4BJuly 6, 20172011pdf5.3 MiB
Appendix-F 508Reach 4BJuly 6, 20172015pdf8.3 MiB2015
Appendix-E 508Reach 4BJuly 6, 20172015pdf0.5 MiB2015
Appendix-D 508Reach 4BJuly 6, 20172015pdf0.6 MiB2015
Appendix-C 508Reach 4BJuly 6, 20172015pdf42 KiB2015
Appendix-B 508Reach 4BJuly 6, 20172015pdf3.5 MiB2015
Appendix A 1D Cross SectionReach 4BJuly 6, 20172015pdf2.2 MiB2015
Reach 4B, Eastside Bypass, andReach 4BJuly 6, 20172015pdf3.4 MiB2015
Attachment 7Reach 4BJuly 6, 20172015pdf0.2 MiB2015
08 App A Attachment 6 SJRRP-4B-Revegetation 508Reach 4BJuly 6, 20172015pdf0.8 MiB2015
Attachment 5Reach 4BJuly 6, 20172015pdf0.6 MiB2015
Attachment 4Reach 4BJuly 6, 20172015pdf0.3 MiB2015
05 App A Attachment 3- Drawings 508Reach 4BJuly 6, 20172015pdf25.6 MiB2015
Attachment 2Reach 4BJuly 6, 20172015pdf12.5 MiB2015