Station Name: 9099090 - Grand Marais, MN
Station Type: Fixed
Data Source: National Data Buoy Center

Elevation Above Sea Level: 617 feet

Nearest Address:
391 MN-61
Grand Marais, MN 55604
Cook County

GPS Coordinates: 47.749, -90.341

Nearby Water Temperatures

Flood Advisory issued May 6 at 12:00PM CDT until May 11 at 3:45PM CDT by NWS Duluth MN

Effective: Wed May 6, 2026, 12:00 PM
Expires: Mon May 11, 2026, 3:45 PM

* WHAT...Flooding caused by rain and snowmelt continues. * WHERE...In Minnesota, Cook, Lake and St. Louis Counties. * WHEN...Until 345 PM CDT Monday. * IMPACTS...Minor flooding in low-lying and poor drainage areas, rivers and around area lakes. Some low-water crossings may become impassable. * ADDITIONAL DETAILS... - At 1145 AM CDT Wednesday, elevated river and lake levels continue. - This includes the following streams and drainages... Isabella River, Moose River, Jeanette Creek, Horse River, Basswood River, Kawishiwi River, and Hustler River. Additional rainfall amounts up to 0.25 inches are expected over the area through early next week. Expect high, fast moving water on area rivers and elevated lake levels. Water levels are near or above those seen during flood events in Spring 2022 and June 2024. Areas near the end of the Gunflint Trail and Ely will see slow decreases in elevated water levels through this weekend. For areas near and on Basswood Lake and Lac La Croix, expect rises to continue into this weekend, with peak flows expected during the week of May 11. Those venturing into the Boundary Waters should prepare for high water and possible inundation of portages and campsites, as well as dangerous rapids and very cold water. - Some locations that will experience flooding include... Gunflint Lake, Snowbank Lake, Basswood Lake, Boundary Waters Canoe Area Wilderness, Fall Lake, White Iron Lake, Sea Gull Lake, Saganaga Lake, Ensign Lake, Disappointment Lake and Lac La Croix. - Flood safety information can be found at www.weather.gov/safety/flood.

Campers and hikers should avoid flooded trail crossings. If camping at a site along or near the banks of rivers or streams, move away from those locations and seek higher ground. Trails in hilly terrain can quickly become unstable during or shortly after heavy rainfall. Portage and hiking trails may be impassable and low-lying campsites may be inundated with excessive runoff in this section of the Boundary Waters as flooding is occurring or imminent. Report observed flooding to local emergency services or law enforcement and to the National Weather Service in Duluth when you can do so safely. Flooding can be reported to the National Weather Service at 1-800-685-8612.

Flood Advisory issued May 7 at 3:14AM CDT until May 11 at 3:45PM CDT by NWS Duluth MN

Effective: Thu May 7, 2026, 3:14 AM
Expires: Mon May 11, 2026, 3:45 PM

* WHAT...Flooding caused by rain and snowmelt continues. * WHERE...In Minnesota, Cook, Lake and St. Louis Counties. * WHEN...Until 345 PM CDT Monday. * IMPACTS...Minor flooding in low-lying and poor drainage areas, rivers and around area lakes. Some low-water crossings may become impassable. * ADDITIONAL DETAILS... - At 305 AM CDT Thursday, elevated river and lake levels continue. - This includes the following streams and drainages... Isabella River, Moose River, Jeanette Creek, Horse River, Basswood River, Kawishiwi River, and Hustler River. Additional rainfall amounts up to 0.25 inches are expected over the area through early next week. Expect high, fast moving water on area rivers and elevated lake levels. Water levels are near or above those seen during flood events in Spring 2022 and June 2024. Areas near the end of the Gunflint Trail and Ely will see slow decreases in elevated water levels through this weekend. For areas near and on Basswood Lake and Lac La Croix, expect rises to continue into this weekend, with peak flows expected during the week of May 11. Those venturing into the Boundary Waters should prepare for high water and possible inundation of portages and campsites, as well as dangerous rapids and very cold water. - Some locations that will experience flooding include... Gunflint Lake, Snowbank Lake, Basswood Lake, Boundary Waters Canoe Area Wilderness, Fall Lake, White Iron Lake, Sea Gull Lake, Saganaga Lake, Ensign Lake, Disappointment Lake and Lac La Croix. - Flood safety information can be found at www.weather.gov/safety/flood.

Campers and hikers should avoid flooded trail crossings. If camping at a site along or near the banks of rivers or streams, move away from those locations and seek higher ground. Portage and hiking trails may be impassable and low-lying campsites may be inundated with excessive runoff in this section of the Boundary Waters as flooding is occurring or imminent. Report observed flooding to local emergency services or law enforcement and to the National Weather Service in Duluth when you can do so safely. Flooding can be reported to the National Weather Service at 1-800-685-8612.