4/5 Masa S. 1 year ago on Google
(Translated
by
Google)
Built
in
the
middle
reaches
of
the
Kanna
River
on
the
border
of
Saitama
and
Gunma
prefectures,
this
is
the
second
largest
multi-purpose
dam
in
the
Tone
River
system
after
the
Yagisawa
Dam.
Sanbasekikyo
Gorge,
a
scenic
spot
designated
as
a
national
natural
monument
just
downstream,
was
devastated
by
a
drought
caused
by
the
construction
of
a
dam.
ing.
It
forms
a
special
L-shape
with
an
auxiliary
dam
that
raises
the
ridge
on
the
right
bank,
and
it
is
this
auxiliary
dam
that
can
be
seen
from
the
Sanbaishikyo
side.
Perhaps
it
was
because
of
the
difficult
construction
due
to
the
special
shape,
or
because
the
technology
was
inexperienced,
but
the
construction
took
nearly
ten
years
and
sacrifices
were
made.
There
is
a
memorial
at
the
end
of
the
auxiliary
dam,
and
the
names
of
eight
people
are
engraved.
(Original)
埼玉群馬県境の神流川の中流域に建設された、利根川水系で八木沢ダムに次ぐ二番目の規模の多目的ダム。
すぐ下流の国の天然記念物に指定された名勝・三波石峡(さんばせききょう)は、ダム建設による渇水で荒廃してしまったが、現在では清流復活のための河川維持放流が行われている。
右岸の尾根をかさ上げする補助ダムをもつ特殊なL字型を形成しており、三波石峡側から見えるのはこの補助ダムである。
特殊な形状による難工事のためか、技術が未熟だったためか、十年近くの工期がかかり犠牲も払うことになった。補助ダムの端には慰霊碑があり、8名の名前が刻まれている。
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