Recorded chokepoint passages for Dorothy Ann, 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/dorothy-ann/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/mackinac/2025-12/freighterlog:passage:367409260:2025-12-31T07:24:59ZDorothy Ann (The Interlake Steamship Company) crossed Straits of Mackinac westbound on 31 Dec 2025 02:24 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Wed, 31 Dec 2025 07:24:59 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:367409260:2025-12-28T08:03:36ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 28 Dec 2025 03:03 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, 28 Dec 2025 08:03:36 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:367409260:2025-12-28T01:57:04ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 27 Dec 2025 20:57 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sun, 28 Dec 2025 01:57:04 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:367409260:2025-12-18T20:21:41ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 18 Dec 2025 15:21 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 20:21:41 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:367409260:2025-12-18T14:28:25ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge downbound on 18 Dec 2025 09:28 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 18 Dec 2025 14:28:25 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:367409260:2025-12-16T07:43:39ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 16 Dec 2025 02:43 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 16 Dec 2025 07:43:39 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:367409260:2025-12-16T01:54:34ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 15 Dec 2025 20:54 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, 16 Dec 2025 01:54:34 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:367409260:2025-12-13T14:09:13ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 13 Dec 2025 09:09 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sat, 13 Dec 2025 14:09:13 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:367409260:2025-12-13T03:57:10ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge downbound on 12 Dec 2025 22:57 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, 13 Dec 2025 03:57:10 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:367409260:2025-12-10T08:02:29ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 10 Dec 2025 03:02 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, 10 Dec 2025 08:02:29 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:367409260:2025-12-10T01:44:55ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 9 Dec 2025 20:44 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, 10 Dec 2025 01:44:55 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:367409260:2025-12-07T07:06:05ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 7 Dec 2025 02:06 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, 07 Dec 2025 07:06:05 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:367409260:2025-12-07T01:39:18ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge downbound on 6 Dec 2025 20:39 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, 07 Dec 2025 01:39:18 GMThttps://freighterlog.com/log/port-huron/2025-12/freighterlog:passage:367409260:2025-12-05T02:41:24ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 4 Dec 2025 21:41 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 05 Dec 2025 02:41:24 GMThttps://freighterlog.com/log/detroit-river/2025-12/freighterlog:passage:367409260:2025-12-04T15:44:26ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 4 Dec 2025 10:44 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 15:44:26 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:367409260:2025-11-25T01:40:41ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 24 Nov 2025 20:40 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, 25 Nov 2025 01:40:41 GMThttps://freighterlog.com/log/port-huron/2025-11/freighterlog:passage:367409260:2025-11-24T20:02:26ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge downbound on 24 Nov 2025 15:02 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 20:02:26 GMThttps://freighterlog.com/log/mackinac/2025-11/freighterlog:passage:367409260:2025-11-24T00:03:50ZDorothy Ann (The Interlake Steamship Company) crossed Straits of Mackinac eastbound on 23 Nov 2025 19:03 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 00:03:50 GMThttps://freighterlog.com/log/mackinac/2025-11/freighterlog:passage:367409260:2025-11-22T17:42:54ZDorothy Ann (The Interlake Steamship Company) crossed Straits of Mackinac westbound on 22 Nov 2025 12:42 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sat, 22 Nov 2025 17:42:54 GMThttps://freighterlog.com/log/port-huron/2025-11/freighterlog:passage:367409260:2025-11-18T08:24:24ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 18 Nov 2025 03:24 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 18 Nov 2025 08:24:24 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:367409260:2025-11-18T02:11:25ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 17 Nov 2025 21:11 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, 18 Nov 2025 02:11:25 GMThttps://freighterlog.com/log/detroit-river/2025-11/freighterlog:passage:367409260:2025-11-09T12:08:29ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 9 Nov 2025 07:08 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 12:08:29 GMThttps://freighterlog.com/log/port-huron/2025-11/freighterlog:passage:367409260:2025-11-09T04:34:59ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge downbound on 8 Nov 2025 23:34 EST. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sun, 09 Nov 2025 04:34:59 GMThttps://freighterlog.com/log/port-huron/2025-10/freighterlog:passage:367409260:2025-10-30T13:44:51ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 30 Oct 2025 09:44 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 30 Oct 2025 13:44:51 GMThttps://freighterlog.com/log/detroit-river/2025-10/freighterlog:passage:367409260:2025-10-30T06:55:29ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 30 Oct 2025 02:55 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 30 Oct 2025 06:55:29 GMThttps://freighterlog.com/log/detroit-river/2025-10/freighterlog:passage:367409260:2025-10-17T04:20:50ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 17 Oct 2025 00:20 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 17 Oct 2025 04:20:50 GMThttps://freighterlog.com/log/port-huron/2025-10/freighterlog:passage:367409260:2025-10-16T20:44:33ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge downbound on 16 Oct 2025 16:44 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Thu, 16 Oct 2025 20:44:33 GMThttps://freighterlog.com/log/port-huron/2025-10/freighterlog:passage:367409260:2025-10-14T22:43:42ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 14 Oct 2025 18:43 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 14 Oct 2025 22:43:42 GMThttps://freighterlog.com/log/detroit-river/2025-10/freighterlog:passage:367409260:2025-10-14T13:17:16ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 14 Oct 2025 09:17 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 14 Oct 2025 13:17:16 GMThttps://freighterlog.com/log/detroit-river/2025-10/freighterlog:passage:367409260:2025-10-12T11:07:08ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 12 Oct 2025 07:07 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sun, 12 Oct 2025 11:07:08 GMThttps://freighterlog.com/log/mackinac/2025-10/freighterlog:passage:367409260:2025-10-10T17:00:09ZDorothy Ann (The Interlake Steamship Company) crossed Straits of Mackinac eastbound on 10 Oct 2025 13:00 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 10 Oct 2025 17:00:09 GMThttps://freighterlog.com/log/mackinac/2025-10/freighterlog:passage:367409260:2025-10-06T11:05:36ZDorothy Ann (The Interlake Steamship Company) crossed Straits of Mackinac westbound on 6 Oct 2025 07:05 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Mon, 06 Oct 2025 11:05:36 GMThttps://freighterlog.com/log/port-huron/2025-10/freighterlog:passage:367409260:2025-10-04T08:06:56ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 4 Oct 2025 04:06 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Sat, 04 Oct 2025 08:06:56 GMThttps://freighterlog.com/log/detroit-river/2025-10/freighterlog:passage:367409260:2025-10-03T22:08:49ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 3 Oct 2025 18:08 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Fri, 03 Oct 2025 22:08:49 GMThttps://freighterlog.com/log/detroit-river/2025-09/freighterlog:passage:367409260:2025-09-24T16:00:25ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 24 Sep 2025 12:00 EDT. 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 Sep 2025 16:00:25 GMThttps://freighterlog.com/log/port-huron/2025-09/freighterlog:passage:367409260:2025-09-24T08:23:44ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge downbound on 24 Sep 2025 04:23 EDT. 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 Sep 2025 08:23:44 GMThttps://freighterlog.com/log/port-huron/2025-09/freighterlog:passage:367409260:2025-09-16T15:23:15ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge upbound on 16 Sep 2025 11:23 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 16 Sep 2025 15:23:15 GMThttps://freighterlog.com/log/detroit-river/2025-09/freighterlog:passage:367409260:2025-09-16T08:45:37ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge upbound on 16 Sep 2025 04:45 EDT. Interpolated from AIS track samples and good to about ±15 minutes; a crossing of the FreighterLog chokepoint line, not an official lock record.Tue, 16 Sep 2025 08:45:37 GMThttps://freighterlog.com/log/detroit-river/2025-09/freighterlog:passage:367409260:2025-09-12T16:44:19ZDorothy Ann (The Interlake Steamship Company) crossed Detroit River / Ambassador Bridge downbound on 12 Sep 2025 12:44 EDT. 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 Sep 2025 16:44:19 GMThttps://freighterlog.com/log/port-huron/2025-09/freighterlog:passage:367409260:2025-09-12T10:13:14ZDorothy Ann (The Interlake Steamship Company) crossed Port Huron / Blue Water Bridge downbound on 12 Sep 2025 06:13 EDT. 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 Sep 2025 10:13:14 GMT