I arrived at the Green Rock trail head about 9:00.  I skied
with a group of five people.  During the course of the day
we skied the Libby Creek Loop, the upper Barber Lake Loop
and the Barber Lake Trail.  At 9:00 there were two vehicles
at the bottom of the Barber Lake Road, two vehicles at the
Corner Mountain trail head, two vehicles at the Little
Laramie trail head, and about 160 vehicles at the Green
Rock trail head.  The skies were clear with mild winds.
The temperature was in the mid to high 20s during the
course of the day.  The snow gauge at the beginning of
the upper Barber Lake loop registered 35 inches of snow.  

I dug a snow pit on the first prominent overlook on the
Libby Creek Loop (NW, NW, SW, NE of Section 24, T16N, R79W).
The orientation of the slope was south south east.  From the
ground up the first 30cm of snow consisted of loosely
consolidated depth hoar (with highly faceted grains >2mm).
The next 20cm was four finger snow.  The next 27cm was 3
finger snow.  Above this there was a 2cm ice layer.  The
next 17cm was loosely consolidated fist snow.  The next
9cm was a two finger block.  The top 18cm was unmetamorphosed
new snow.  The  temperature rose from -8 C at the surface of
the snow to 0 C at the ground.

I conducted a shovel shear test.  The snow pack failed between
every layer described above.  The fist snow directly the ice
layer appeared to be particularly unstable.  My personal
evaluation was that the snow pack was still fairly unstable.

During the course of the day I encountered approximately
twenty-five skiers and advised all skiers to stay off of
the Libby Creek ridge due to unstable snow conditions.