Kuzalisha toleo ngumu zaidi ya sentensi hii Echo Canyon Dam, ambayo impounds Echo Canyon Reservoir, ilijengwa katika 1969 - 70.
Bila shaka, toleo ngumu zaidi ya sentensi ni "Echo Canyon Dam ilijengwa mwaka 1969 - 70, na ni bwawa la mbali zaidi chini ya mkondo kwenye Meadow Valley Wash. "