When the Great Missoula Flood poured over this region, it left
behind large coulees like Moses Coulee, Grand Coulee, Frenchman
Coulee, and Potholes Coulee. As the flood waters flowed east to
west, the coulees were carved out in a west to east direction. The
cache is located at the east end of the coulee where the growth of
this coulee stopped. From this vantage point, you will look down on
an upper extension of the main coulee which appears to resemble the
shape of a human thumb. There is an unnamed pond about 150 feet
down at the bottom. This horseshoe shaped coulee is lined with tall
basalt columns which were exposed by the flood. This portion of the
coulee heads from here in a northerly direction and turns west
before dropping an additional 200 feet into the Ancient Lakes.
To get here, Park near H Lake and hike cross country to the
cache.
Here is a 3D topo map of the Potholes Coulee. The cache is
located at the east end of the thumb shaped upper coulee.
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