There is a poem that I'm trying to remember the name and author of,
exact text of, and the details of the Greek myth to which it refers.
Odd thing is I remember almost all of it, but I can't find it online
anywhere. I think it is by John Fowles (or John Knowles?) and reads something like 
(without line breaks), "That mason of Arta, who build a bridge, and
the bridge fell down, and built it again, and the bridge fell down,
again and again, and the bridge fell down; until he was told the price
to pay to have it stand; and so buried his wife alive below with his
own hard hand. Amid the dust, I understand." Question is: 1) exact
author, 2) exact title, 3) full text, 4) details of the mason of Arta
thing that's referred to.

I have not been able to find your poem online. I suspect that it may
be in John Fowles' 1973 collection, "Poems." I hope another Researcher
will be able to locate it.

Regarding the myth of the Bridge of Arta, here's a summary:

"The most famous landmark of Arta is its legendary stone bridge which
was built in 1602 and it spans with its beautiful arches the width of
Artachthos river. The Arta bridge is a visual delight and for
centuries it has acquired mythical proportions with numerous legends
taking shape around its carefully placed stones. The most famous
legend is the one that details the bridge's creation as an improbable
feat in the midst of an endless cycle of destruction and rebuilding.

An entire epic poem is dedicated to this legend, and it describes in
lyrical terms how the masons built the structure all day long just to
find that it collapsed overnight. With this process repeating itself
for a long time to the desperation of the masons, only divine
intervention could save the bridge, and it came in the form of a
message from a bird. The building of the bridge according to the
message required the personal sacrifice of the foreman's beautiful
wife. The poem revolves around the foreman's conflict between his own
tragic personal loss, and the resulting common good. The conflict
resolves itself with the tragic death of the young wife as she
unknowingly becomes victim for the benefit of the greater society.
This epic poem has survived through oral tradition for centuries.

The term 'the bridge of Arta' was coined after the legend and it is
used widely in modern Greek to describe any endless process that tends
to repeat itself in pointless cycles."

http://www.greeklandscapes.com/greece/arta.html

hi i m Greek and i have the poem in Greek.I dont know if thats what
you re looking for but its the traditional poem that we use in
Greece.I dont know if someone made another contemporary poem based on
that one.If you re interested tell me to translate it for you.Its
quite long though...xxx Danai

No thanks--it's the contemporary English poem by John Fowles I was
interested in, not the original Greek epic poem. Thanks though...