wow, CTD, you've outdone yourself this time!

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You say "bends around obstacles would not be classed as meanders" and post that pic! Now folks, is it your brains or your eyesight RAZD underestimates?
Yes, and we are talking about how the canyon was formed, before it was carved to the depth it is today. Using the existing canyon to say that it cause the canyon to form that way is a circular argument and a post hoc ergo propter hoc fallacy.

Fill that canyon to just barely over the brim, to envisage how it would look before any canyon was carved, and then show me where there is an obstruction.

What is there along the rock left in the flat topped middle area that is different from where the river flowed? Run a straight edge from the far left edge to the far right edge: is the peninsula above or below this line? Note that the picture was taken at eye level on the edge of the canyon, so you can mentally adjust all edges up 5ft for greater accuracy if so inclined.

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In how many evoyears' worth of floods?
You continue to post this rather bizarre statement, one that is totally irrelevant to any argument I have made, and the only thing it shows is that you have misunderstood something.

geologist: meanders are formed by slow flow eroding the outside banks of rivers and depositing material along the inside, making bends become more sinuous as this erosion process continues.

CTD: "how many evoyears' worth of floods" does that take?

Can you explain how your comment is related to the geological explanation of meander formation?

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Not much more evidence is needed. The pictures you've chosen are a good start, perhaps enough that nothing further will be required.
Except that you have totally failed to demonstrate that they are caused by floods. All you have shown is that the current canyon is an obstacle for the river being in a different place today, a logically trite (tautological) and rather meaningless as an observation about how the canyon formed.

Hint: start with flood flows, and look at what they do. Find a formation similar to the picture above that was formed by the flood flow. The scablands is a good example of flood erosion.

Enjoy.