Glacier National Park: Saint Mary Lake


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St. Mary Lake is on the Eastern side of Glacier National Park. Going to the Sun road runs along its North shore. At 10 miles long and 300 feet deep it is the second largest lake in the park.


We boarded a ranger guided lake tour at the Rising Sun Dock, around the midpoint of the lake. I’d reserved it in advance with the Glacier Park Boat Company. The tour traveled from Rising Sun to the Baring Falls dock at the head of the lake in about 30 minutes, with Ranger Melissa narrating the whole way down.


As we traveled towards the Baring Falls dock at the head of the lake, we passed by Wild Goose Island, which we’d previously seen from a different perspective up on Going to the Sun Road.


As we approached the snow-covered peaks at the head of the lake, Melissa pointed out Sexton Glacier, visible on Mount Matahpi, just beyond Going to the Sun Mountain. Like most of the glaciers in the park, it is shrinking and has lost over 30% of its mass in the last 50 years.


We learned that the glaciers are the reason for St. Mary’s unique turquoise color. The slow movement of the ice grinds up the rock into a fine dust called glacial flour. The runoff carries the glacier flour into the lake where the particles remain suspended in the water, reflecting back the light.


Two Medicine and McDonald lakes are beautiful, but not the same vibrant hue as the East side lakes because there are no glaciers feeding into them. The NPS estimates that all the park’s glaciers will be gone by 2030 and then the Eastern lakes will lose their color.


At the dock, we disembarked and took a guided hike with Ranger Melissa. On the way back we passed another small island called Rainbow Island.


To see all of my Going to the Sun Posts, please click the following links:


Location: Going-to-the-Sun Road, East Glacier Park, MT 59434, USA

Designation: National Park

Date designation declared: 5/11/1910

Date of my visit: 6/24/2018

St Mary Lake on a 3D model of the park at the St. Mary Visitor Center

7 thoughts on “Glacier National Park: Saint Mary Lake

  1. Pingback: National Parks USA Glacier National Park: Saint Mary Falls

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