Hey Tn, very nice thread, and very informative. Gotta build a tripod for future trips. I have a place that is begging to be dug and sifted. Posted some pics of the shelter way back.
The sifters got me thinking of a gold hunting method I learned years ago from a cousin out in Yosemite. Mind, he wasn't looking for artifacts, but I can see where it would be of some benefit for our use, artifact hunting.
When looking in water that is running, i.e. river or stream, it is difficult to see through the sheen of same. Try this...
Build a box (his was 12"x 12") but upsizing for our purpose could be beneficial, I think. Use 1x12 lumber and just build a square or rectangular box with no bottom. Then get you a piece of plexi-glass to cover the bottom and seal. (you don't want water coming in) Put a couple slots in the sides up near the top for handholds. The idea is to place the box on the surface of the water, plexi-glass down, and look thru the top down into the box. Breaking the sheen of the water, you will be amazed how much better you will be able to see into the water. My cousin (looking for gold) used this method quite successfully searching various creeks and looking into cracks and fissures in running water. What he found was truly fantastic, but that is another story.
Best of luck to all,
BW