Aha! Looks like that old concrete structure supported the old old bridge for logging trucks to barrel across! Thanks for this photo, really interesting. Now, I have a map from 1978 which marks the lower falls, the upper falls, then Burke falls and finally the old Burma Bridge in ascending order. Tried to upload the map but it's too big. Have googled Burke falls but no info shows up. Was just curious if anyone has heard of them. On my map it looks like the "lookout" area on the west canyon trail is right across from these falls. I'm assuming the "lookout" is the spot where you can see Gold Creek from high up. You look up the creek from this spot. I'm going to try to look across the creek next time I'm up at the "lookout" to see if i can see any sign of these Burke falls! Trees may hamper the view however.