you will be wanting to fish worm when the river is slightly coloured or in flood as this is the time that worms will be washed into the river with the rain. set up your rod with about 4 BB split shot and a size 6 or larger hook. bait as many redworms on the hook as possible or 2 large lob worms. cast above a likely lie and feel for any tugs on the line with your fingers as the worm/s drift downstream. give a salmon plenty of time to move off with the bait or you will not get a proper hook-hold.
ATB
Aaron