Chadeaux, you got my mind working overtime.
I decided to check Google
( now that I knew what they are called. )
There are hundreds of them!
All I found were large ones.
The one that I posted is small, I'm pretty sure.
Next trip to the creek, I'm going to try to build the small one just to see if it works.
Also, I think that there is one of the large ones in a local creek that runs thru a local state park.
I have seen the large "V" shape and just figured it was from flooding and time.
Time is the key to it. I think that it was there long before any recent flooding and has lasted thru them.
It will take time and someone to go with me. Best from canoe trip.
Thanks again, Chadeaux.
#/;0)~ (c)