FreighterLog The record of Great Lakes shipping

Archive: January 2024 to December 2025, 28,207 passages. Seaway transits checked hourly. Last checked 2026-09-23 18:00 UTC — 14:00 EDT. NOAA publishes in quarterly batches, and the archive currently runs nine months behind.

Archive to December 2025 · Seaway checked 2026-09-23 18:00 UTC — 14:00 EDT

Fleet-matched vessel · Canada flag

Thunder Bay

Canada Steamship Lines · Self-unloader · 225 m. Range: Lakes and Seaway. 258 recorded passages across 6 chokepoints.

Last recorded passage

westbound at Straits of Mackinac

28 Dec 2025, 15:45 EST — ±15 min · see the December 2025 log

This is an archive, not a tracker. The passage record runs January 2024 to December 2025 and ends at 31 Dec 2025. The public AIS archive arrives in quarterly batches and currently runs nine months behind. Nothing on this page tells you where Thunder Bay is today. Her last recorded passage was 3 days before the archive ends, and that gap is about the record, not necessarily about the ship.

FreighterLog is the record, not the map. For where Thunder Bay is right now, see BoatNerd's live AIS map, which runs on their own receivers on the lakes, or VesselFinder.

Follow by RSS. Every crossing Thunder Bay makes goes into a feed of her own, added when the next batch of the public AIS archive is processed. It is a file on this domain: no account, no email address, and nothing that reports back. Thunder Bay feed · all chokepoints

Specification

Dimensions and identifiers as broadcast over AIS; AIS-reported figures are self-declared by the vessel and are not a registry of record.
Name (AIS) THUNDER BAY
MMSI 316023339
IMO IMO9601039
Call sign CFN6288
Length overall 225 m (738 ft)
Beam 24 m (79 ft)
AIS vessel type Cargo
Hull type Self-unloader
Operator Canada Steamship Lines
Flag Canada

Passage record

  • 258 Passages January 2024 – December 2025
  • 6 Chokepoints of 7 monitored
  • 29 Mar 2024 First in archive UTC date
  • 28 Dec 2025 Last in archive UTC date

Where she was recorded

Season passage log

Local time at each chokepoint · grouped by month (UTC buckets)

Times are interpolated from AIS track samples, good to about fifteen minutes, and shown in each chokepoint's local time. A passage is a track crossing our gate line, not an official lock record.

2025 season

December 2025 8 passages
Date Local time Chokepoint Direction
28 Dec 2025 15:45 EST Straits of Mackinac westbound
27 Dec 2025 23:05 EST Port Huron / Blue Water Bridge upbound
27 Dec 2025 17:15 EST Detroit River / Ambassador Bridge upbound
25 Dec 2025 20:20 EST Welland Canal (Thorold) upbound
3 Dec 2025 18:39 EST Welland Canal (Thorold) downbound
2 Dec 2025 21:25 EST Detroit River / Ambassador Bridge downbound
2 Dec 2025 15:46 EST Port Huron / Blue Water Bridge downbound
1 Dec 2025 18:04 EST Soo Locks (St. Marys River) downbound
November 2025 11 passages
Date Local time Chokepoint Direction
28 Nov 2025 09:09 EST Soo Locks (St. Marys River) upbound
25 Nov 2025 23:52 EST Detroit River / Ambassador Bridge upbound
24 Nov 2025 20:06 EST Welland Canal (Thorold) upbound
16 Nov 2025 08:52 EST Welland Canal (Thorold) downbound
15 Nov 2025 07:09 EST Detroit River / Ambassador Bridge downbound
15 Nov 2025 00:56 EST Port Huron / Blue Water Bridge downbound
14 Nov 2025 02:31 EST Soo Locks (St. Marys River) downbound
9 Nov 2025 05:50 EST Soo Locks (St. Marys River) upbound
8 Nov 2025 09:10 EST Port Huron / Blue Water Bridge upbound
7 Nov 2025 23:43 EST Detroit River / Ambassador Bridge upbound
7 Nov 2025 01:26 EST Welland Canal (Thorold) upbound
October 2025 4 passages
Date Local time Chokepoint Direction
6 Oct 2025 13:28 EDT Welland Canal (Thorold) downbound
5 Oct 2025 16:58 EDT Detroit River / Ambassador Bridge downbound
5 Oct 2025 11:24 EDT Port Huron / Blue Water Bridge downbound
4 Oct 2025 15:28 EDT Soo Locks (St. Marys River) downbound
September 2025 16 passages
Date Local time Chokepoint Direction
30 Sep 2025 00:00 EDT Soo Locks (St. Marys River) upbound
29 Sep 2025 01:05 EDT Port Huron / Blue Water Bridge upbound
28 Sep 2025 19:07 EDT Detroit River / Ambassador Bridge upbound
27 Sep 2025 20:20 EDT Welland Canal (Thorold) upbound
21 Sep 2025 23:11 EDT Welland Canal (Thorold) downbound
21 Sep 2025 00:24 EDT Detroit River / Ambassador Bridge downbound
20 Sep 2025 18:15 EDT Port Huron / Blue Water Bridge downbound
19 Sep 2025 20:46 EDT Soo Locks (St. Marys River) downbound
16 Sep 2025 18:51 EDT Soo Locks (St. Marys River) upbound
15 Sep 2025 19:56 EDT Port Huron / Blue Water Bridge upbound
15 Sep 2025 11:08 EDT Detroit River / Ambassador Bridge upbound
14 Sep 2025 11:37 EDT Welland Canal (Thorold) upbound
4 Sep 2025 09:16 EDT Welland Canal (Thorold) downbound
3 Sep 2025 10:37 EDT Detroit River / Ambassador Bridge downbound
3 Sep 2025 04:37 EDT Port Huron / Blue Water Bridge downbound
2 Sep 2025 08:13 EDT Straits of Mackinac eastbound
August 2025 13 passages
Date Local time Chokepoint Direction
27 Aug 2025 10:34 EDT Straits of Mackinac westbound
26 Aug 2025 14:56 EDT Port Huron / Blue Water Bridge upbound
26 Aug 2025 05:45 EDT Detroit River / Ambassador Bridge upbound
11 Aug 2025 23:02 EDT Welland Canal (Thorold) downbound
10 Aug 2025 09:20 EDT Detroit River / Ambassador Bridge downbound
10 Aug 2025 03:16 EDT Port Huron / Blue Water Bridge downbound
9 Aug 2025 06:34 EDT Soo Locks (St. Marys River) downbound
7 Aug 2025 20:16 CDT Superior Entry outbound
7 Aug 2025 08:26 CDT Superior Entry inbound
5 Aug 2025 09:18 EDT Soo Locks (St. Marys River) upbound
4 Aug 2025 10:13 EDT Port Huron / Blue Water Bridge upbound
4 Aug 2025 03:21 EDT Detroit River / Ambassador Bridge upbound
2 Aug 2025 11:21 EDT Welland Canal (Thorold) upbound
July 2025 11 passages
Date Local time Chokepoint Direction
23 Jul 2025 07:04 EDT Welland Canal (Thorold) downbound
22 Jul 2025 06:11 EDT Detroit River / Ambassador Bridge downbound
22 Jul 2025 00:38 EDT Port Huron / Blue Water Bridge downbound
21 Jul 2025 05:20 EDT Straits of Mackinac eastbound
16 Jul 2025 13:52 EDT Straits of Mackinac westbound
11 Jul 2025 19:57 EDT Soo Locks (St. Marys River) downbound
9 Jul 2025 12:04 EDT Soo Locks (St. Marys River) upbound
8 Jul 2025 11:54 EDT Port Huron / Blue Water Bridge upbound
8 Jul 2025 02:33 EDT Detroit River / Ambassador Bridge upbound
7 Jul 2025 06:07 EDT Welland Canal (Thorold) upbound
1 Jul 2025 00:46 EDT Welland Canal (Thorold) downbound
June 2025 17 passages
Date Local time Chokepoint Direction
30 Jun 2025 01:43 EDT Detroit River / Ambassador Bridge downbound
29 Jun 2025 20:02 EDT Port Huron / Blue Water Bridge downbound
28 Jun 2025 21:38 EDT Soo Locks (St. Marys River) downbound
27 Jun 2025 11:38 CDT Superior Entry outbound
26 Jun 2025 21:38 CDT Superior Entry inbound
25 Jun 2025 15:25 EDT Soo Locks (St. Marys River) upbound
25 Jun 2025 03:51 EDT Straits of Mackinac eastbound
22 Jun 2025 08:43 EDT Straits of Mackinac westbound
21 Jun 2025 13:11 EDT Port Huron / Blue Water Bridge upbound
21 Jun 2025 06:23 EDT Detroit River / Ambassador Bridge upbound
19 Jun 2025 08:24 EDT Welland Canal (Thorold) upbound
16 Jun 2025 16:50 EDT Welland Canal (Thorold) downbound
14 Jun 2025 05:42 EDT Detroit River / Ambassador Bridge downbound
13 Jun 2025 14:05 EDT Port Huron / Blue Water Bridge downbound
11 Jun 2025 09:52 EDT Port Huron / Blue Water Bridge upbound
11 Jun 2025 03:36 EDT Detroit River / Ambassador Bridge upbound
10 Jun 2025 04:40 EDT Welland Canal (Thorold) upbound
May 2025 18 passages
Date Local time Chokepoint Direction
27 May 2025 14:20 EDT Welland Canal (Thorold) downbound
26 May 2025 14:31 EDT Detroit River / Ambassador Bridge downbound
26 May 2025 08:54 EDT Port Huron / Blue Water Bridge downbound
25 May 2025 10:41 EDT Soo Locks (St. Marys River) downbound
24 May 2025 00:12 CDT Superior Entry outbound
23 May 2025 08:57 CDT Superior Entry inbound
21 May 2025 02:54 EDT Soo Locks (St. Marys River) upbound
20 May 2025 02:53 EDT Port Huron / Blue Water Bridge upbound
19 May 2025 20:48 EDT Detroit River / Ambassador Bridge upbound
18 May 2025 22:28 EDT Welland Canal (Thorold) upbound
13 May 2025 05:29 EDT Welland Canal (Thorold) downbound
12 May 2025 04:32 EDT Detroit River / Ambassador Bridge downbound
11 May 2025 22:52 EDT Port Huron / Blue Water Bridge downbound
10 May 2025 23:32 EDT Soo Locks (St. Marys River) downbound
6 May 2025 15:31 EDT Soo Locks (St. Marys River) upbound
5 May 2025 14:11 EDT Port Huron / Blue Water Bridge upbound
5 May 2025 04:46 EDT Detroit River / Ambassador Bridge upbound
4 May 2025 02:37 EDT Welland Canal (Thorold) upbound
April 2025 13 passages
Date Local time Chokepoint Direction
26 Apr 2025 12:24 EDT Welland Canal (Thorold) downbound
25 Apr 2025 04:33 EDT Detroit River / Ambassador Bridge downbound
24 Apr 2025 22:49 EDT Port Huron / Blue Water Bridge downbound
24 Apr 2025 00:21 EDT Soo Locks (St. Marys River) downbound
20 Apr 2025 00:40 EDT Soo Locks (St. Marys River) upbound
18 Apr 2025 16:11 EDT Port Huron / Blue Water Bridge upbound
18 Apr 2025 11:11 EDT Detroit River / Ambassador Bridge upbound
16 Apr 2025 22:58 EDT Welland Canal (Thorold) upbound
8 Apr 2025 16:29 EDT Welland Canal (Thorold) downbound
7 Apr 2025 17:53 EDT Detroit River / Ambassador Bridge downbound
7 Apr 2025 11:20 EDT Port Huron / Blue Water Bridge downbound
6 Apr 2025 15:14 EDT Soo Locks (St. Marys River) downbound
2 Apr 2025 08:29 EDT Soo Locks (St. Marys River) upbound
March 2025 2 passages
Date Local time Chokepoint Direction
31 Mar 2025 19:42 EDT Port Huron / Blue Water Bridge upbound
31 Mar 2025 10:43 EDT Detroit River / Ambassador Bridge upbound

2024 season

December 2024 16 passages
Date Local time Chokepoint Direction
29 Dec 2024 21:08 EST Detroit River / Ambassador Bridge downbound
29 Dec 2024 14:59 EST Port Huron / Blue Water Bridge downbound
28 Dec 2024 18:30 EST Soo Locks (St. Marys River) downbound
26 Dec 2024 10:50 EST Soo Locks (St. Marys River) upbound
25 Dec 2024 05:47 EST Detroit River / Ambassador Bridge upbound
24 Dec 2024 07:50 EST Welland Canal (Thorold) upbound
18 Dec 2024 03:30 EST Welland Canal (Thorold) downbound
17 Dec 2024 02:50 EST Detroit River / Ambassador Bridge downbound
16 Dec 2024 20:19 EST Port Huron / Blue Water Bridge downbound
15 Dec 2024 23:15 EST Soo Locks (St. Marys River) downbound
11 Dec 2024 15:04 EST Soo Locks (St. Marys River) upbound
11 Dec 2024 06:11 EST Straits of Mackinac eastbound
4 Dec 2024 18:02 EST Straits of Mackinac westbound
3 Dec 2024 23:07 EST Port Huron / Blue Water Bridge upbound
3 Dec 2024 16:36 EST Detroit River / Ambassador Bridge upbound
2 Dec 2024 18:55 EST Welland Canal (Thorold) upbound
November 2024 15 passages
Date Local time Chokepoint Direction
22 Nov 2024 20:40 EST Welland Canal (Thorold) downbound
20 Nov 2024 22:56 EST Detroit River / Ambassador Bridge downbound
20 Nov 2024 16:37 EST Port Huron / Blue Water Bridge downbound
19 Nov 2024 20:09 EST Soo Locks (St. Marys River) downbound
17 Nov 2024 23:53 CST Superior Entry outbound
17 Nov 2024 14:34 CST Superior Entry inbound
14 Nov 2024 18:10 CST Superior Entry outbound
14 Nov 2024 07:24 CST Superior Entry inbound
13 Nov 2024 01:17 EST Soo Locks (St. Marys River) upbound
9 Nov 2024 11:11 EST Soo Locks (St. Marys River) downbound
6 Nov 2024 21:59 EST Soo Locks (St. Marys River) upbound
6 Nov 2024 12:47 EST Straits of Mackinac eastbound
3 Nov 2024 11:44 EST Straits of Mackinac westbound
2 Nov 2024 17:41 EDT Port Huron / Blue Water Bridge upbound
2 Nov 2024 11:15 EDT Detroit River / Ambassador Bridge upbound
October 2024 15 passages
Date Local time Chokepoint Direction
31 Oct 2024 13:13 EDT Detroit River / Ambassador Bridge downbound
30 Oct 2024 10:08 EDT Soo Locks (St. Marys River) downbound
29 Oct 2024 14:47 EDT Soo Locks (St. Marys River) upbound
28 Oct 2024 16:21 EDT Port Huron / Blue Water Bridge upbound
28 Oct 2024 10:41 EDT Detroit River / Ambassador Bridge upbound
26 Oct 2024 15:17 EDT Detroit River / Ambassador Bridge downbound
26 Oct 2024 09:29 EDT Port Huron / Blue Water Bridge downbound
21 Oct 2024 16:55 EDT Soo Locks (St. Marys River) downbound
18 Oct 2024 06:08 EDT Soo Locks (St. Marys River) upbound
17 Oct 2024 07:29 EDT Port Huron / Blue Water Bridge upbound
17 Oct 2024 00:44 EDT Detroit River / Ambassador Bridge upbound
16 Oct 2024 13:34 EDT Detroit River / Ambassador Bridge downbound
16 Oct 2024 07:03 EDT Port Huron / Blue Water Bridge downbound
13 Oct 2024 12:28 EDT Port Huron / Blue Water Bridge upbound
13 Oct 2024 03:00 EDT Detroit River / Ambassador Bridge upbound
September 2024 7 passages
Date Local time Chokepoint Direction
30 Sep 2024 18:48 EDT Detroit River / Ambassador Bridge downbound
30 Sep 2024 13:00 EDT Port Huron / Blue Water Bridge downbound
29 Sep 2024 14:37 EDT Soo Locks (St. Marys River) downbound
24 Sep 2024 06:59 EDT Soo Locks (St. Marys River) upbound
23 Sep 2024 07:31 EDT Port Huron / Blue Water Bridge upbound
22 Sep 2024 19:57 EDT Detroit River / Ambassador Bridge upbound
20 Sep 2024 18:05 EDT Welland Canal (Thorold) upbound
August 2024 14 passages
Date Local time Chokepoint Direction
24 Aug 2024 11:03 EDT Welland Canal (Thorold) downbound
23 Aug 2024 12:54 EDT Detroit River / Ambassador Bridge downbound
23 Aug 2024 07:23 EDT Port Huron / Blue Water Bridge downbound
22 Aug 2024 09:29 EDT Soo Locks (St. Marys River) downbound
21 Aug 2024 00:16 CDT Superior Entry outbound
17 Aug 2024 21:45 CDT Superior Entry inbound
16 Aug 2024 09:55 EDT Soo Locks (St. Marys River) upbound
15 Aug 2024 11:04 EDT Port Huron / Blue Water Bridge upbound
15 Aug 2024 05:07 EDT Detroit River / Ambassador Bridge upbound
14 Aug 2024 06:24 EDT Welland Canal (Thorold) upbound
7 Aug 2024 01:10 EDT Welland Canal (Thorold) downbound
6 Aug 2024 02:01 EDT Detroit River / Ambassador Bridge downbound
5 Aug 2024 20:37 EDT Port Huron / Blue Water Bridge downbound
4 Aug 2024 22:48 EDT Soo Locks (St. Marys River) downbound
July 2024 27 passages
Date Local time Chokepoint Direction
31 Jul 2024 14:32 EDT Soo Locks (St. Marys River) upbound
30 Jul 2024 14:59 EDT Port Huron / Blue Water Bridge upbound
30 Jul 2024 01:40 EDT Detroit River / Ambassador Bridge upbound
29 Jul 2024 15:31 EDT Detroit River / Ambassador Bridge downbound
29 Jul 2024 09:42 EDT Port Huron / Blue Water Bridge downbound
27 Jul 2024 02:05 EDT Port Huron / Blue Water Bridge upbound
26 Jul 2024 20:20 EDT Detroit River / Ambassador Bridge upbound
24 Jul 2024 21:53 EDT Detroit River / Ambassador Bridge downbound
24 Jul 2024 16:07 EDT Port Huron / Blue Water Bridge downbound
23 Jul 2024 18:10 EDT Soo Locks (St. Marys River) downbound
22 Jul 2024 05:12 CDT Superior Entry outbound
21 Jul 2024 21:18 CDT Superior Entry inbound
19 Jul 2024 08:19 EDT Soo Locks (St. Marys River) upbound
18 Jul 2024 09:46 EDT Port Huron / Blue Water Bridge upbound
18 Jul 2024 01:24 EDT Detroit River / Ambassador Bridge upbound
15 Jul 2024 22:17 EDT Detroit River / Ambassador Bridge downbound
15 Jul 2024 16:25 EDT Port Huron / Blue Water Bridge downbound
14 Jul 2024 18:02 EDT Soo Locks (St. Marys River) downbound
13 Jul 2024 02:15 CDT Superior Entry outbound
12 Jul 2024 08:20 CDT Superior Entry inbound
9 Jul 2024 05:06 EDT Soo Locks (St. Marys River) upbound
5 Jul 2024 15:35 EDT Soo Locks (St. Marys River) downbound
2 Jul 2024 17:55 EDT Soo Locks (St. Marys River) upbound
1 Jul 2024 19:18 EDT Port Huron / Blue Water Bridge upbound
1 Jul 2024 13:20 EDT Detroit River / Ambassador Bridge upbound
1 Jul 2024 02:41 EDT Detroit River / Ambassador Bridge downbound
30 Jun 2024 20:50 EDT Port Huron / Blue Water Bridge downbound
June 2024 15 passages
Date Local time Chokepoint Direction
28 Jun 2024 18:25 EDT Port Huron / Blue Water Bridge upbound
28 Jun 2024 11:46 EDT Detroit River / Ambassador Bridge upbound
27 Jun 2024 11:31 EDT Welland Canal (Thorold) upbound
21 Jun 2024 20:02 EDT Welland Canal (Thorold) downbound
20 Jun 2024 21:25 EDT Detroit River / Ambassador Bridge downbound
20 Jun 2024 15:39 EDT Port Huron / Blue Water Bridge downbound
19 Jun 2024 17:32 EDT Soo Locks (St. Marys River) downbound
14 Jun 2024 00:39 EDT Soo Locks (St. Marys River) upbound
13 Jun 2024 00:57 EDT Port Huron / Blue Water Bridge upbound
12 Jun 2024 14:55 EDT Detroit River / Ambassador Bridge upbound
12 Jun 2024 06:15 EDT Detroit River / Ambassador Bridge downbound
11 Jun 2024 22:05 EDT Port Huron / Blue Water Bridge downbound
9 Jun 2024 07:17 EDT Port Huron / Blue Water Bridge upbound
9 Jun 2024 00:56 EDT Detroit River / Ambassador Bridge upbound
8 Jun 2024 03:30 EDT Welland Canal (Thorold) upbound
May 2024 16 passages
Date Local time Chokepoint Direction
26 May 2024 13:18 EDT Welland Canal (Thorold) downbound
25 May 2024 14:31 EDT Detroit River / Ambassador Bridge downbound
25 May 2024 05:56 EDT Port Huron / Blue Water Bridge downbound
24 May 2024 09:18 EDT Soo Locks (St. Marys River) downbound
20 May 2024 19:18 EDT Soo Locks (St. Marys River) upbound
19 May 2024 20:51 EDT Port Huron / Blue Water Bridge upbound
19 May 2024 15:20 EDT Detroit River / Ambassador Bridge upbound
18 May 2024 18:53 EDT Welland Canal (Thorold) upbound
12 May 2024 10:02 EDT Welland Canal (Thorold) downbound
11 May 2024 13:20 EDT Detroit River / Ambassador Bridge downbound
11 May 2024 07:49 EDT Port Huron / Blue Water Bridge downbound
10 May 2024 11:25 EDT Soo Locks (St. Marys River) downbound
7 May 2024 01:41 EDT Soo Locks (St. Marys River) upbound
6 May 2024 04:18 EDT Port Huron / Blue Water Bridge upbound
5 May 2024 18:25 EDT Detroit River / Ambassador Bridge upbound
4 May 2024 21:40 EDT Welland Canal (Thorold) upbound
April 2024 16 passages
Date Local time Chokepoint Direction
28 Apr 2024 20:51 EDT Welland Canal (Thorold) downbound
27 Apr 2024 23:47 EDT Detroit River / Ambassador Bridge downbound
27 Apr 2024 18:17 EDT Port Huron / Blue Water Bridge downbound
26 Apr 2024 21:12 EDT Soo Locks (St. Marys River) downbound
23 Apr 2024 09:24 EDT Soo Locks (St. Marys River) upbound
22 Apr 2024 11:40 EDT Port Huron / Blue Water Bridge upbound
22 Apr 2024 05:38 EDT Detroit River / Ambassador Bridge upbound
21 Apr 2024 09:43 EDT Welland Canal (Thorold) upbound
15 Apr 2024 19:24 EDT Welland Canal (Thorold) downbound
14 Apr 2024 21:13 EDT Detroit River / Ambassador Bridge downbound
14 Apr 2024 15:32 EDT Port Huron / Blue Water Bridge downbound
13 Apr 2024 18:40 EDT Soo Locks (St. Marys River) downbound
10 Apr 2024 11:02 EDT Soo Locks (St. Marys River) upbound
9 Apr 2024 12:30 EDT Port Huron / Blue Water Bridge upbound
9 Apr 2024 06:37 EDT Detroit River / Ambassador Bridge upbound
8 Apr 2024 10:37 EDT Welland Canal (Thorold) upbound
March 2024 4 passages
Date Local time Chokepoint Direction
31 Mar 2024 16:41 EDT Welland Canal (Thorold) downbound
30 Mar 2024 19:50 EDT Detroit River / Ambassador Bridge downbound
30 Mar 2024 13:37 EDT Port Huron / Blue Water Bridge downbound
29 Mar 2024 17:29 EDT Soo Locks (St. Marys River) downbound