Which, in the case with your rod being that it is an Orvis, it will most likely behave best with a 6wt. line (or "HDH" to keep it old school speak). But as has been said above, try different lines on it to see what feels best for you. In answer to your original question "where and when...". As others here have said as well, I use bamboo rods almost 100% of the time. Freshwater, salt (your Orvis impregnated is a great beach rod!), trout, searun cutthroats and salmon, bass and bluegills. I use them for everything except tropical trips like Kenneth had said (but I really want to get my next bonefish on bamboo!). Here's one of many Puget Sound beach searuns I've caught on an Orvis rod similar to yours, although in a 3/2 config'. The rod shows no sign of ever being used in the salt although I've used it there a lot; Fish your bamboo rod. It's what it was made to do. Oh, and if you go to the link that Kent provided Greg (the guy that runs that site) can provide you with detailed info' on everything about your rods origins and register it there for you as well.