LNM11-80CA6D
SÉCURITÉReceived 23 Sept 2026, 00:00 UTC
Warning text
Positions open on the mapSECTOR SAN FRANCISCO, TERRITORIAL SEA - SECTOR SAN FRANCISCO, SUBMERGED LAND ACT (SLA)
General / Marine Construction (Excluding Bridges) / Facilities, Barriers, Manmade Reefs, Riprap, Jetties / Dikes
Rock barrier construction will be conducted in the channels of Middle River, Old River, and Grant Line Canal, San Joaquin County. The scope of operations includes excavators from the levee dropping rock in the channels to build barriers across to the opposite levee. No barges will be used for the installation of the barriers. Operations are scheduled as follows: Construction: May 1, 2026, through the first week of June 2026 Barrier in place: First week of June 2026 through end of October 2026 Removal: November 1, 2026, through November 30, 2026 The channels will be blocked until approximately November 30, 2026. DWR will provide boat portage at Old River and Grant Line Canal, but not at Middle River, which is not navigable due to shallow depth. Locations of operation: Middle River near Victoria Canal: 37-53.14N 121-28.93W Old River near Tracy: 37-48.62N 121-32.57W Grant Line Canal near Tracy Boulevard Bridge: 37-49.19N 121-26.90W No vessels are involved in the operation. This activity is referenced on Chart US4CA46M. For additional information, please contact the Area Control Center at (209) 833-2180 (24-hour phone). All mariners are advised to transit the area with caution and observe all navigation restrictions and portage instructions.
USCG Southwest District Local Notice to Mariners 45/2026
Location map
Open on the full mapKeywordsmarine construction