Here's a fishy over 12" ...
... taken on a Tenkara rod.
http://i273.photobucket.com/albums/j...003_edited.jpg
This guy went 17" and I caught him in some pretty fast current. He ate a large weighted rubber legs stonefly nymph, which is certainly as heavy as any of the streamers you mentioned, fished off a 13' TenkaraUSA Ayu.
I don't fish streamers with Tenkara rods, but I think you would do very well if dead drifting them. Swinging them might be another matter, especially if you were to hook up with a large fish - pop goes the tip.:shock:
John