Trimtabist
The US Trade Ledger — every US container gateway, every partner country, every month. Census-recorded, AIS-verified.
TT-001 · Gateway watch

Berthings per day at US gateways

tt001.us-gateways.arrivals observed

Count of merchant vessels observed coming alongside per day at the monitored US container gateways. Merchant vessel = AIS ship-type 70-79 (cargo) and 150 m or longer. Without that filter this count is dominated by tugs.

We pulled this number.

STATUS: WITHDRAWN · SINCE 1970-01 · RETURNS WHEN THE CONDITION BELOW IS MET

SUPERSEDED. Computed from the crew-set NavigationalStatus field and the old event state machine, both disproven 2026-07-30: the status field recorded 153 anchor events against 3,273 berth events because crews rarely set it, and the state machine split single calls into fragments on speed noise. Replaced by position-based detection in berthing.db — see tt001.gateway.* and berthing/METHOD.md. We will not serve data we cannot stand behind, so this page stays up but the numbers do not.

More on the practice: withdrawn data.

Unit
berthings/day
Evidence
EVIDENCE: OBSERVED
Tempo
TEMPO: SHORT
Covers
2026-07-26 → now

We watched it happen: our own AIS receivers (via the aisstream.io terrestrial network), our timestamps, our archive.

Cite this

In print: Berthings per day at US gateways, per the Trimtab US Trade Ledger, an independent mirror of AISstream.io → own recorder (retrieved 2026-08-06) — trimtabist.com/series/tt001.us-gateways.arrivals
For the record: Trimtab TT-001 Gateway watch, "Berthings per day at US gateways" (retrieved 2026-08-06).
Trimtab TT-001 Gateway watch, own-recorded AIS.
Licence CC BY 4.0

This address is permanent. If this figure is revised or corrected, the change is printed here with its size.

Machine readable

Updated: 2026-08-06 (regenerated on every request from the live registry)
/series/tt001.us-gateways.arrivals.csv — tidy long format
/series/tt001.us-gateways.arrivals.metadata.json — provenance, coverage, citation
POST /mcp — query_series, describe_series