Show 4 14 L 1 A IS low t SPILLWAY TUNNEL the spillway tunnel at flaming gorge is ic bored through 50 aik oik lid rock the view Is i looking into the tunnel from the downstream portal of the do dam th jumbo drill rig Is i at the head of the tunnel and Is ic preparing to ie drill another roun fouad rod rock bolts or are used in limited numbers number for support up perr the spillway tunnel is ii bored to a 21 foot foo diameter at downstream end and and a 30 foot diameter ll amele at upstream ream it has ha been evacuated eT for a foot length and has ha 00 feet to go later lh the tunnel will be lined with concrete |