Another method I have used to good effect, is the DRIFT DIVE; kinda like dredging without all the heavy gear

. Many of you will have tried this method before.
Drifting with the current and looking into nooks and crannys for some easy gold. Sometimes it really is that easy, it's just sitting there on the bedrock, glowing up at you. Usually though a little easy work is required, move a few rocks, scrape out some cracks and pick at pebbles jammed into holes to get under them, scrape or suck out the wash. I usually carry an old, small, lidded paint container to put this into, (poverty pot in old timer lingo) then pan the contents when it gets heavy.
All I need is a wet suit, pan, mask, snorkel, and a few creviceing tools. A waterproof bag like kayakers use, in a pack would be handy, if you have to walk upstream a ways before drifting back. You can put dry footwear and clothing in it, saves hiking in wet your suit, and you get a dry change when you finish.
Or you can get dropped off at a bridge or other access point, then have a car waiting at your exit point. This will save time, and get you into the river (and hopefully the gold) much quicker.
The rivers I choose are reasonably shallow, and I don't go "shooting rapids" or anything resembling canyoning, finding the gold is the thrill for me - not risking injury by getting bashed into rocks, or wedged under them at high speed. Another thing I stay away from is log jams, piles of branches etc, too easy to get caught up in that stuff. I cover most of the river walking between deeper patches, looking for spots to hunt.
So I get to a spot that looks interesting - exposed bedrock down deep, and ledges of bedrock above deep holes. I dive down and wave away grit from any low spots - get my face-mask down close to the action to see better. Let the current carry me along scanning for color.
Areas where bedrock can be exposed easily by shifting a few boulders are good too. Some of these are so shallow I don't even need to use the snorkel, others deep as I ever want to dive, and hard to get down to without a weight-belt. After that it's mostly creviceing, look in Lanny's thread
http://forum.treasurenet.com/index.php/topic,453.msg2637896.html#msg2637896 for really good instructions on how to work crevices.
Dang it I still can't get that link to work.
Waving - mentioned above, is a handy technique for underwater creviceing, it's fanning small amounts of grit away from the bedrock by hand, just wave at it close up and you'll get it moving - to expose a couple of good pickers if you are lucky. A nice big pair of tweezers are handy on this job as well as most of the stuff Lanny and J W list. The sniffer bottle and crevice sucker would be really useful.
With or without a buddy, it's a great day out on the river. Hope you get a chance to do a little of this, and find some "nuggies".
Lanny, and most others in them cold northern parts will just have to wait a few more months I guess

. Nuggy