9305-B3499- 1. Water monsters were spirits who lived in the Columbia river and swept victims into the currents. This Indian rock art (petroglyph) was removed from the Big Eddy area before being lost under the backwater of the The Dalles Dam in 1957. It was photographed in 1974 while at the Winquatt Museum in The Dalles. This rock art is now located on Temani Pesh-wa Trail in Columbia Hills State Park (formerly Horsethief Lake State Park), on the Washington side of the Columbia River Gorge near The Dalles.