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Open data · every figure carries its source

World Shipping DirectoryCompanies · Ships · Fleets

A public reference property of Baalvion

Open data · every figure carries its source

World Shipping DirectoryCompanies · Ships · Fleets

Tug

USCGC Storis

IMO 9579016MMSI 367141000Call sign WDG2524United StatesBuilt 2012

Operated by United States Coast Guard

Photo: United States Coast Guard/Edison Chouest Offshore · Public domain · file

Largest in this registry

#32,560

of 84,014 with a recorded tonnage

Largest tug

of 1,263 of this type with a recorded tonnage

Largest in its fleet

of 8 in this fleet with a recorded tonnage

In brief

About USCGC Storis

Full article ↗

USCGC Storis (WAGB-21) is a United States Coast Guard medium icebreaker. She was originally built as the icebreaking anchor handling tug supply vessel (AHTS) Aiviq to support oil exploration and drilling in the Chukchi Sea off Alaska. The USCG acquired the vessel in December 2024 and she was commissioned in Juneau on 10 August 2025.

Quoted from USCGC Storis (WAGB-21) on English Wikipedia, reused under CC BY-SA 4.0.

Vessel particulars

Identification and dimensions

Every value is as recorded in the source. Blanks are values the source does not hold — none is estimated from a sister ship or a class average.

Identification

In context

How USCGC Storis compares

Every figure in this section is a count, a rank or a percentile over vessels actually held in this registry — not over the world fleet, which is larger. Nothing here is estimated.

At 12,892 gross tons, USCGC Storis is the 32,560th largest of the 84,014 vessels in this registry that report a tonnage. The median across that set is 5,994 GT, so this hull is about 2.2 times the typical vessel on record here. The largest measures 499,167 GT.

Among the 1,471 tugs held here, it ranks 2nd by tonnage — larger than 100% of that group. Their median tonnage is 393 GT, and the largest tenth begin at 1,733 GT. The flag most often flown by this group is United States (239 ships). The yard that appears most often against it is Damen Shipyards Gorinchem, with 62 hulls on record.

United States is the country of registry for 2,278 vessels in this directory, of which USCGC Storis is the 295th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (977 ships), and the median vessel measures 1,706 GT. Browse every ship flagged United States.

Narrowing to both dimensions at once, this registry holds 239 tugs flying the United States flag, of which none is larger than USCGC Storis.

USCGC Storis was built in 2012, making it 14 years old. It is one of 2,747 hulls in this registry delivered that year, a cohort whose median tonnage is 23,456 GT; within it this ship is the 1,614th largest. Across the whole of the 2010s the registry holds 20,111 vessels, median 23,456 GT. The median build year across the entire registry is 1995.

The registry attributes 95 vessels to North American Shipbuilding, with a median tonnage of 2,912 GT, delivered between 1978 and 2018. See the rest of that yard’s output.

At 95.5 m overall, USCGC Storis is 63.1 m longer than the 32.3 m median for tugs on record, with a beam of 24.4 m and a draft of 7.9 m.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 9579016 this registry holds 75 other vessels, whose median build year is 2011 and which range from 2009 to 2016. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 2012.

Its IMO number, 9579016, carries its own check digit. The first six digits are weighted seven down to two and summed — 9×7 + 5×6 + 7×5 + 9×4 + 0×3 + 1×2 = 166 — and the last digit of that total, 6, must equal the seventh digit, 6. It does, so this number is well formed.