Recorded chokepoint passages for Robert S Pierson, newest first. The record, not the map: this feed carries passages already in the archive, which ends at December 2025. Vessel data derived from the Nationwide Automatic Identification System (NOAA Office for Coastal Management, marinecadastre.gov), CC0.https://freighterlog.com/vessels/robert-s-pierson/en-usVessel data derived from the Nationwide Automatic Identification System (NOAA Office for Coastal Management, marinecadastre.gov), CC0. Transit and lock data from the St. Lawrence Seaway Management Corporation / Saint Lawrence Seaway Development Corporation public vessel-transit table (seaway-greatlakes.com).Wed, 23 Sep 2026 18:23:30 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:316011905:2025-12-30T04:37:50ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge upbound on 29 Dec 2025 23:37 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 30 Dec 2025 04:37:50 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:316011905:2025-12-26T01:26:22ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge downbound on 25 Dec 2025 20:26 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 26 Dec 2025 01:26:22 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-25T19:41:28ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 25 Dec 2025 14:41 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 25 Dec 2025 19:41:28 GMThttps://freighterlog.com/log/soo/2025-12/freighterlog:passage:316011905:2025-12-24T23:57:52ZRobert S Pierson (Algoma Central) crossed Soo Locks (St. Marys River) downbound on 24 Dec 2025 18:57 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 24 Dec 2025 23:57:52 GMThttps://freighterlog.com/log/soo/2025-12/freighterlog:passage:316011905:2025-12-19T20:33:44ZRobert S Pierson (Algoma Central) crossed Soo Locks (St. Marys River) upbound on 19 Dec 2025 15:33 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 19 Dec 2025 20:33:44 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-18T04:41:58ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 17 Dec 2025 23:41 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 18 Dec 2025 04:41:58 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-17T16:13:48ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 17 Dec 2025 11:13 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 17 Dec 2025 16:13:48 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-15T02:36:35ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 14 Dec 2025 21:36 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Mon, 15 Dec 2025 02:36:35 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-14T15:41:03ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 14 Dec 2025 10:41 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sun, 14 Dec 2025 15:41:03 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-12T23:16:15ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 12 Dec 2025 18:16 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 12 Dec 2025 23:16:15 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:316011905:2025-12-12T15:43:03ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge upbound on 12 Dec 2025 10:43 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 12 Dec 2025 15:43:03 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-11T22:04:09ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 11 Dec 2025 17:04 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 11 Dec 2025 22:04:09 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-09T10:18:51ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 9 Dec 2025 05:18 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 09 Dec 2025 10:18:51 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:316011905:2025-12-09T04:57:41ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge upbound on 8 Dec 2025 23:57 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 09 Dec 2025 04:57:41 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:316011905:2025-12-08T23:28:04ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge downbound on 8 Dec 2025 18:28 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Mon, 08 Dec 2025 23:28:04 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-08T10:24:55ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 8 Dec 2025 05:24 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Mon, 08 Dec 2025 10:24:55 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-06T17:30:48ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 6 Dec 2025 12:30 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sat, 06 Dec 2025 17:30:48 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-06T06:18:56ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 6 Dec 2025 01:18 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sat, 06 Dec 2025 06:18:56 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-04T16:10:15ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 4 Dec 2025 11:10 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 04 Dec 2025 16:10:15 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-04T02:14:47ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 3 Dec 2025 21:14 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 04 Dec 2025 02:14:47 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:316011905:2025-12-01T08:42:58ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 1 Dec 2025 03:42 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Mon, 01 Dec 2025 08:42:58 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:316011905:2025-11-30T13:26:17ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge upbound on 30 Nov 2025 08:26 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sun, 30 Nov 2025 13:26:17 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:316011905:2025-11-27T17:16:53ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge downbound on 27 Nov 2025 12:16 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 27 Nov 2025 17:16:53 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:316011905:2025-11-26T23:34:56ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge upbound on 26 Nov 2025 18:34 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 26 Nov 2025 23:34:56 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:316011905:2025-11-26T17:51:32ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge downbound on 26 Nov 2025 12:51 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 26 Nov 2025 17:51:32 GMThttps://freighterlog.com/log/port-huron/2025-11/freighterlog:passage:316011905:2025-11-24T02:42:48ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 23 Nov 2025 21:42 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Mon, 24 Nov 2025 02:42:48 GMThttps://freighterlog.com/log/port-huron/2025-11/freighterlog:passage:316011905:2025-11-23T14:31:16ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 23 Nov 2025 09:31 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sun, 23 Nov 2025 14:31:16 GMThttps://freighterlog.com/log/mackinac/2025-11/freighterlog:passage:316011905:2025-11-22T11:48:35ZRobert S Pierson (Algoma Central) crossed Straits of Mackinac eastbound on 22 Nov 2025 06:48 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sat, 22 Nov 2025 11:48:35 GMThttps://freighterlog.com/log/mackinac/2025-11/freighterlog:passage:316011905:2025-11-20T05:09:17ZRobert S Pierson (Algoma Central) crossed Straits of Mackinac westbound on 20 Nov 2025 00:09 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 20 Nov 2025 05:09:17 GMThttps://freighterlog.com/log/mackinac/2025-11/freighterlog:passage:316011905:2025-11-15T13:57:17ZRobert S Pierson (Algoma Central) crossed Straits of Mackinac westbound on 15 Nov 2025 08:57 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sat, 15 Nov 2025 13:57:17 GMThttps://freighterlog.com/log/soo/2025-11/freighterlog:passage:316011905:2025-11-15T06:15:52ZRobert S Pierson (Algoma Central) crossed Soo Locks (St. Marys River) downbound on 15 Nov 2025 01:15 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sat, 15 Nov 2025 06:15:52 GMThttps://freighterlog.com/log/soo/2025-11/freighterlog:passage:316011905:2025-11-14T04:35:16ZRobert S Pierson (Algoma Central) crossed Soo Locks (St. Marys River) upbound on 13 Nov 2025 23:35 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 14 Nov 2025 04:35:16 GMThttps://freighterlog.com/log/port-huron/2025-11/freighterlog:passage:316011905:2025-11-13T06:59:02ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 13 Nov 2025 01:59 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 13 Nov 2025 06:59:02 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:316011905:2025-11-12T20:56:35ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge upbound on 12 Nov 2025 15:56 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 12 Nov 2025 20:56:35 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:316011905:2025-11-12T17:47:44ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge upbound on 12 Nov 2025 12:47 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 12 Nov 2025 17:47:44 GMThttps://freighterlog.com/log/port-huron/2025-11/freighterlog:passage:316011905:2025-11-12T11:56:02ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge downbound on 12 Nov 2025 06:56 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 12 Nov 2025 11:56:02 GMThttps://freighterlog.com/log/port-huron/2025-11/freighterlog:passage:316011905:2025-11-09T18:17:54ZRobert S Pierson (Algoma Central) crossed Port Huron / Blue Water Bridge upbound on 9 Nov 2025 13:17 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sun, 09 Nov 2025 18:17:54 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:316011905:2025-11-09T00:32:14ZRobert S Pierson (Algoma Central) crossed Detroit River / Ambassador Bridge upbound on 8 Nov 2025 19:32 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sun, 09 Nov 2025 00:32:14 GMThttps://freighterlog.com/log/welland/2025-11/freighterlog:passage:316011905:2025-11-06T12:00:15ZRobert S Pierson (Algoma Central) crossed Welland Canal (Thorold) upbound on 6 Nov 2025 07:00 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 06 Nov 2025 12:00:15 GMThttps://freighterlog.com/log/welland/2025-11/freighterlog:passage:316011905:2025-11-05T06:51:31ZRobert S Pierson (Algoma Central) crossed Welland Canal (Thorold) downbound on 5 Nov 2025 01:51 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 05 Nov 2025 06:51:31 GMT