Every year on the Feast of Epiphany, those of us at St. Simeon Skete hike down to the river to toss the Blessed Cross into the it, as the Cross flows from tributary to tributary it blesses the waters, making all water Baptismal
For more information on this NHA Tradition, see these links.
http://blog.nazarethhouseap.org/2013/01/epiphany-2013.html
http://blog.nazarethhouseap.org/2012/01/6-january-2006-feast-of-epiphany.html