USCGC Spar Begins Breaking Ice in Duluth Harbor
On March 9, 2026, the U.S. Coast Guard Cutter Spar began icebreaking operations in Duluth-Superior Harbor, signaling that the long winter grip on Lake Superior is slowly loosening as the Great Lakes shipping season draws closer.
For residents and ship watchers along the harbor, Spar carving through frozen water marks a familiar late-winter milestone. Each year, Coast Guard cutters open navigation channels before the Great Lakes shipping season begins in late March. The work happening now helps ensure that when the first cargo vessels arrive, the harbor will be ready.
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Preparing Duluth Harbor for the Start of Shipping Season
Although winter still lingers across northern Minnesota, the calendar is shifting toward spring.
Forecasts for the coming month show temperatures gradually climbing into the upper 30s and even low 40s, with occasional warmer days reaching into the mid-40s and near 50°F by late March. While snowfall will continue periodically, the overall warming trend begins weakening harbor ice.
That combination of warming temperatures and Coast Guard icebreaking allows critical shipping routes to reopen safely.
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Duluth is one of the busiest ports on the Great Lakes, handling cargo such as iron ore, grain, coal, and limestone. If ice blocks the harbor entrance or navigation channels, large freighters cannot safely enter or depart.
By breaking and clearing ice now, USCGC Spar ensures the harbor is ready when commercial shipping resumes.
Meet USCGC Spar: Duluth’s Icebreaking Workhorse
The USCGC Spar (WLB-206) is a 225-foot Juniper-class seagoing buoy tender and icebreaker operated by the United States Coast Guard.
Built in 2001 by Marinette Marine Corporation in Wisconsin, Spar serves as a multi-mission vessel for buoy tending, search and rescue, and icebreaking. Its reinforced hull and propulsion system allow it to break about 14 inches of freshwater ice continuously. When needed, the cutter can break up to 36 inches of packed ice by backing and ramming. Spar also carries a 40,000-pound crane used for buoy operations and maritime maintenance across the Great Lakes.
The cutter operates with a crew of around 50 Coast Guard members, including both officers and enlisted personnel.
From Alaska to Lake Superior
Before arriving in Duluth, Spar spent most of its career stationed far to the northwest.
After being commissioned in August 2001, the cutter was assigned to Kodiak, Alaska, where it handled buoy tending and icebreaking duties across the Aleutian Islands for two decades.
In 2021, the vessel underwent a major midlife maintenance overhaul at the Coast Guard shipyard in Baltimore to extend its operational life.
By March 2022, Spar had officially taken up its new assignment in Duluth, Minnesota, where it now supports navigation safety and icebreaking across the upper Great Lakes.
Why the Cutter Is Named “Spar”
The vessel’s name honors the U.S. Coast Guard Women’s Reserves, created during World War II.
The program was nicknamed the SPARs, derived from the Coast Guard motto “Semper Paratus,” meaning “Always Ready.” Women who served in the SPAR program supported Coast Guard missions during wartime operations.
The current cutter is the second Coast Guard ship to carry the name Spar, continuing that legacy.
A Familiar Sign That Spring Is Coming
In Duluth, icebreaking season often becomes a signal that the long winter is beginning to shift.
With daylight now stretching more than 11 hours each day and temperatures slowly trending upward, the harbor will gradually transition from frozen waterways to open shipping lanes.
For locals along Lake Superior’s shoreline, the low rumble of a Coast Guard cutter crushing ice across the harbor isn’t just a maritime operation.
It’s the sound of spring approaching on the Great Lakes.
The live cam experience has been provided by lsmma.com.
FAQ: USCGC Spar and Duluth Icebreaking
Why is USCGC Spar breaking ice in Duluth Harbor?
The cutter is clearing harbor channels ahead of the annual Great Lakes shipping season, which usually begins in late March.
What type of ship is USCGC Spar?
USCGC Spar (WLB-206) is a Juniper-class buoy tender and icebreaker operated by the U.S. Coast Guard.
How thick of ice can USCGC Spar break?
Spar can break around 14 inches of ice continuously, and up to 36 inches of packed ice by backing and ramming.
Where is USCGC Spar homeported?
Since March 2022, the Coast Guard has stationed the cutter in Duluth, Minnesota, where it supports operations across Lake Superior and the upper Great Lakes.
