Some of it, (definitely not all of it)
is water OVER the bridge.
Some of it is 'still to come'
And so very separate
from any that flows below.
These are
Possible future showers maybe,
Not necessarily great happenings,
But normal everyday watering.
It's all stuff that isn't yet or might never be
'Water under the bridge'
Not this bridge anyway,
But
Maybe water under another bridge
Downstream
Head water?
Water that hasn't decided,
Hasn't made its watershed choices .
It isn't all 'bridge over the water' either.
There are streams that run dry under them.
And Bridges that don't span year round creeks .
There is that which bridges the dry gulch - the waterless gap.
Stones that merely span the dry periods of life.
Stones that wait in the bridge indefinitely
For rain,
For a mere 'covering' of wetness.
So that the bridge may be, at least,
if only briefly,
all wet ..
And more, under the wetness of water
than ever being 'any' (let alone - 'all' )
water under the bridge .