Le barrage de l'Ondenon est un ouvrage français situé sur la commune de La Ricamarie, au sud-ouest de la ville de Saint-Étienne .D'une capacité de 400 000 m3, la retenue est opérationnelle en 1904 après 3 ans de travaux. Son eau présente une grande limpidité, fruit d'efforts menés par la collectivité en vue de préserver cet espace fragile. Actions ayant permis son classement en ZNIEFF de type I, puis Natura 2000.
Source: Wikipedia.org
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