Set up a minecart magma shotgun
...or pump magma into the river
...or do like i did in a larger scale
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>>flow <<< pump >>> pump
upstream downstream
, ground 20 logs
~ water 80 stone blocks
X gear assembly 5 mechanisms
= axle 20 enormous corkscrews
▓ wall 20 pipe sections
% % pump (on floor if river) -----------------------
[ | ] water wheel 60 logs
░ (0-1/7 water) 25 stone
or like that...
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>>flow <<< pump upstream
, ground 15 logs
~ water 40 stone blocks
X gear assembly 3 mechanisms
= axle 10 enormous corkscrews
▓ wall 10 pipe sections
% % pump (on floor if river) -----------------------
[ | ] water wheel 35 logs
░ (0-1/7 water) 13 stone
water takes about 10 minutes to reach 0-1/7 level
...then build a 1x10 bridge across the river bed link it to a lever and pull it to raise the bridge