The white arrow you placed indicates a tiny drainage slot which is not the shortcut. There is a broad low U-shaped saddle in the Navajo sandstone ridge slightly above and to the right of your arrow. At 3670 the water began to cover that saddle so it was wide and easy to cross to Halls which lies immediately west, behind that ridge. On another recent post with older Bullfrog photos there are a couple pictures showing this saddle when lake was full enough so that it was covered. It looks just like it’s part of the Bay. That little canyon you marked is below the water level necessary to flood the saddle, and would have been covered up and invisible to boaters. The “way” was not narrow such as this Canyon might be. It was wide and open and you simply hit the gas and cruised from one bay to the next without a worry or a care. Go check out those photos in the other post. Search Bullfrog.