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Historical Ice Breakup Dates for Chequamegon Bay, Lake Superior, 1911 to 2019 (ver. 2.0, May 2019)


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Evrard, L.M., 2019, Historical Ice Breakup Dates for Chequamegon Bay, Lake Superior, 1911 to 2019 (ver. 2.0, May 2019): U.S. Geological Survey data release,


Ice breakup dates of Chequamegon Bay, Lake Superior from 1911 to 2019. Ice breakup date is the day in spring when winter ice cover substantially leaves a water body. Local residents deem "ice breakup" as when the ice moves northeast of a line straight across Chequamegon Bay out from Ellis Avenue (State highway 13). Another way ice breakup was determined has been if you could drive a boat from the outlet of Fish Creek to Houghton Point. The ice may move back and forth over that line but the ice is breaking up, moving and melting from that date on. Ellis Avenue ends on a bluff (46.5925 degrees North, 90.8827 degrees West) that provides a clear view of Chequamegon Bay from Fish Creek to Houghton Point. Mrs. C. J. Hoskings recorded the [...]


Point of Contact :
Lori M Evrard
Originator :
Lori M Evrard
Metadata Contact :
Lori M Evrard
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Great Lakes Science Center
USGS Mission Area :

Attached Files

Click on title to download individual files attached to this item.

“Chequamegon ice breakup map”
thumbnail 900.97 KB
Chequamegon Bay ice breakup graph 1911-2019.jpg
“Chequamegon Bay ice breakup graph”
thumbnail 226.68 KB
Chequamegon Bay Ice Breakup 1911-2019 USGS.csv
“Chequamegon Bay ice breakup data”
1.59 KB
Cheq Bay Ice Breakup revision history.txt
“Chequamegon Bay ice breakup revision history”
515 Bytes
Cheq Bay Ice Breakup v2.0 metadata.xml
Original FGDC Metadata

10.23 KB


Data was collected by townspeople from 1911 to 1999 and 2001 and was provided to the USGS station in Ashland, WI. USGS continued monitoring the ice condition and recorded the date of ice breakup to present. USGS converted the dates to Julian dates. Ice breakup dates can be important data for climate research.
Chequamegon ice breakup map
Chequamegon ice breakup map



  • Great Lakes Science Center (GLSC)
  • USGS Data Release Products



Revision 2.0 by Lori M Evrard on May 15, 2019. To review the changes that were made, see “Cheq Bay Ice Breakup revision history.txt” in the attached files section.

Additional Information


Type Scheme Key
DOI doi:10.5066/F7HT2NNP

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