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[Chief10]

How can I change the path of a river? For about 50 y-tiles, I want it to run 15 x-tiles to the left of where it currently is, so that I have more space for my sheep to graze. My outdoor town is entirely on the eastern part of a river running North-South.

[Naryar]

Pour magma on it.

then prune your obsidian dam like you desire.

then dig an artificial river via channels.

[kirmaster]

dig a channel in the place where you want to have the river, except the first and last set of connecting tiles.
Place some floodgates, and hook them up to a lever. Now dig out the exit with the floodgates shut, and then the entrance. then open both floodgates and water should flow through the new channel, lowering the amount of water in the initial river to 4/7 or less- then you can build some floodgates in it and close them, so the new channel is the river. This is harder with  multi-level deep rivers, but solvable by making a bigger channel.

[escondida]

You can also install a drain underneath. Make a tunnel to the edge of the map, smooth and fortify the map edge. Build a raising bridge in the tunnel right next to where you want to dig through the ceiling (so you can shut the drain), then dig up-ramps through the river bed. Once that's done, everything downstream of your drain will dry up, so you can wall it off and dig your artificial riverbed. While you're at it, you could use this as an opportunity to install flow control (raising bridges) for both river beds.

[GhostDwemer]

Since no one has mentioned it, screw pumps. Floor across a section of river, and place screw pumps on the floors, drawing from downstream and pumping upstream. Dwarf power them, and then build walls under the intake tile. You may need wall beside the river to contain the extra water.

[KtosoX]

Mine out a nice channel with an optional underground cistern and a controlled drain as suggested above. Once your done with the ground work simply wait for winter. Channel out a layer of ice and either place some floodgates or block it up.

[Sadrice]

Dwarf power them, and then build walls under the intake tile. You may need wall beside the river to contain the extra water.

Since your building them very close to a river, there's no reason not to just put a few waterwheels upstream.  Doing it manually may result in your pump operator popping out for a quick drink at a bad time, flooding your site, canceling your wall building, and possibly drowning the workers.