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 I built this to handle the larger boulders on a streach of creek

 a friend of mine owned. This was when dredging was still legal

 in Calif.  I used a 1 ton chain hoist from Harbor Freight Tools,

 I bought the floats from Keene and had the local welding  shop fab.

 the rest.  Also had a rock net made for it at a cable / wire rope

 shop.  Float it over the boulder, put rock net over it, tighten

 up with the chain hoist, ( work from the up stream side ) and

 hoist it up to clear what is needed and float it out of the way!

 Boulders in the 300 to 400 # (?) range no problem, ( never

 weighted any of them ) .  Still have and doing duty for a long

 time friend along with the rest of my dredging gear  in Georgia.