well, there is the oregon coast where conditions can be ok to trecherous. i dove in newport at the south jetty sunday and it was the most dangerous conditions ive ever been in. good learning experience. so i think there are a few lakes in the cascades you can dive in but not a lot to look at. ive heard clear lake is nice. i usually head up to the puget sound or hood canal area in washington. if you do dive locally in the high elevation you will have to take into account the altitude and factor it in when you dive. and you will definately need a dry suit. i dont know anyone who uses a wetsuit. it is just too cold. it is too bad you are so far from diving. i am currently camping and exploring the fossil beds here outside of dayville. beautiful but i dont like being so far from the ocean for diving. i recoment the area to check out if you are not too far. the painted hills national monument is also stunning. well good luck and i hope this helps a little.