Mark Tinsky wrote in message ...


There were millions of tricos in plumes all up and down the road.
My question is do the eggs and nymphs somehow survive the winter
in a dry ditch

....don't know about tricos.
But I do know thousands of large fish die in those ditches
every fall, when they suddenly shut the water off.
Birds and rodents remove the evidence within a day or two.
So the evidence is ephemeral.

The ditch riders say fish-screens at the diversions
are impossible, as they would be constantly clogged
with stuff.

Perhaps if they shut the ditches off in volume increments
over a 3-4 day period: some of those fish might make
it back out to the river. The effects of catch and release
add up to between zip and none, compared to the number
of fish that die in western irrigation ditches each year.