Hi Cothi,
The stretch of which you enquire is indeed good Salmon water, the club to which i belong holds the rights to the fishing from just above the metal bridge downsream for a mile or so, guest tickets are available if you know a member

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Next beat downstream is again Angling Association water on the right hand bank and Merthyr Angling on the left bank ( tickets are up for grabs on the Wild Trout Auction ).
Above the bridge the right hand bank is in private ownership and the left hand bank belongs to Glan Usk Estate ending at the famous Larder pool.
However a beat at the confluence of the Grwyne Fawr ( Dan y Warren ) is available via the Wye and Usk Foundation.
G
P.S other options available too given the right water if youd like to p.m i may be able to help