Thursday, May 7, 2009

Kalskag report

Kalskag is 23 miles down river from Crow Village. The river issues there are possibly backing up to Crow Village. Here is the report from morning of May 7 on the Alaska River Forecast website:

The two ice jams between Aniak and Kalskag both released
this afternoon. The jam at the Kusko split (RM 167)
released and sent some of the ice down the Old River. This
surge likely helped push out the lower end of the Old River
so now it is freely flowing. The remainder of the ice went
down the main channel towards Kalskag. This run pushed down
the remaining ice sheets to Kalskag. The bottom end of the
jam below Lower Kalskag did peel off when the Old River blew
out. However the jam still holds and now backs up large
pans and sheets to a couple miles above Upper Kalskag.
About three miles of chunk ice is then stacked up behind the
pans/sheets to about 5 miles above Upper Kalskag. Water
levels have risen in Kalskag since the initial issuance of
the flood warning. The road between the airport and Lower
Kalskag is impassable with water levels encircling the
foundation of the old school that burned down. Flood waters
also cross the road between the airport and Upper Kalskag.
Minor flooding so far for Kalskag. On the detailed Kusko
maps, the back edge of the packed ice is right at 1st
Slough. This slough is taking much of the flow of the main
channel and bypassing Kalskag into the Old River...acting as
a little relief valve. The Birch Crossing jam also
released with a decent ice run heading downstream. During
our flight it had reached the split between the Old River
and main Kalskag channel. It looked like the ice run would
split down both channels. Earl just gave a late evening
report and it sounded like much of the ice run went down the
Old River after we left. Nonetheless, there is still a lot
of water above Kalskag so their flood levels may rise
overnight before the jam releases below Lower Kalskag.

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