No place close to Mt Hood, but you might check to see if anyone is diving Crater Lake. You are talking dry suit diving or at least a 7MM. As Oregon waters are cold even in the summer time. Crater Lake is beautiful as is Mt Hood. You might check to see if anyone drift dives the Sandy River. It is near by. I don't know if they dive in the Columbia River or not due to the currents and ship traffic. They dive the Oregon Coast at Newport and also Tacoma, Washington has a great beach dive site for seeing the giant octipus(sp) that live there.
Have Fun.
Zuzanne