Ghost Streams

What is an arroyo?
It is a ghost stream

I have seen them
approaching in the clouds
once a year
like Halloween
flying down from the sky
pouring over the land
The arroyos rise from the grave
full and flush
unlike any other day of the year
thundering through the night
and disappearing at dawn
then riding off
with the wind
and leaving behind
the legend
of rivers in the desert
the arroyo