Although I returned from my two July shows a week ago, I have not been posting on the blog because my beloved camera broke. The on/off switch quit working. I have sent it in for repairs and acquired a smaller point and shoot camera to use in the mean time. Plus, when weather is bad, I will use this smaller camera rather than my main camera. The battery for the new camera is still charging, but I hope to use it tonight to take a few pictures.
In the mean time, I will reprint some of the information from a 2011 posting as well as photos of the dunes posted over the years.
The Grand Sable Dunes are located in the Grand Marais end of the Pictured Rocks
National Lakeshore.
The Grand Sable Dunes are some the world’s most pristine perched dunes.
They cover a five mile stretch between the Sable River and Au Sable
point. Glacial ice that melted within the Superior Basin around 10,000
years ago produced many large rivers. These rivers deposited millions of
tons of debris into many different configurations south of the Superior
Basin. The Grand Sable Banks most likely originated along one of these
glacial rivers.
Around 8,500 years ago, the Pictured Rocks area then became very dry
when the Lake Superior basin changed its drainage pattern and began
emptying to the north from its east end when this new outlet was the low
spot. A north facing bluff formed and remained in place for 4,500 years
right around the Grand Marais area.
Between 4,000 and 6,000 years ago, the land mass that is now the Upper
Peninsula started to rebound upward from the weight of the previous ice
glacier. This is called isostatic rebound. The U.P. is still rebounding
today. The land forming the lake's outlet at North Bay began to rise,
which reduced the amount of outflow and caused water levels to rise
rapidly. In fact, Lake Superior rose to about 40 feet higher than it is
today! The rise in lake levels formed Lake Nipissing. Lake levels of
Lake Nipissing also began to rise which caused the Grand Sable Banks to
become unstable. The higher water eroded the bluffs which left them
exposed to wind. A dominant northwesterly wind blew through the Grand
Sable Banks which carried the wind from the bluff to the top of the flat
upland. This sand was “perched” on top of the upland, hence the name,
“perched dune system.”
The climate of the Grand Sable Dunes is typical of any Michigan climate.
The winters are fairly long and cold while the summers are short and
cool. The location of the dunes happens to be the second most cloudy
area of the United States. The average cloud cover is approximately 70%.
Grand Marais’ annual temperature is 40.8 degrees Fahrenheit with
precipitation totaling 31 inches a year. During the winter season
snowfall accumulation ranges from 130 to over 200 inches. Because the
dunes are so close to Lake Superior extreme low temperatures in the
winter and extreme high temperatures in the summer do not occur.
If you plan on taking the hike to the Grand Sable Dunes the best way to
get there would be to take the trail that starts at the west end of the
Sable Falls parking area. While on the trail you will walk through an
old field and eventually cross over a bridge that runs about Sable
Creek. For the next ¼ mile you will go through the forests and dune
transition areas.
NOTE: Some of the information from this posting was acquired from
http://www.geo.msu.edu/geogmich/grand_sable.htm and
http://hunts-upguide.com/grand_marais_grand_sable_bank___dunes.html.