We're about 200 miles upstream from Portland. The marina I'm in has all covered moorage except for slips for sailboats. On this side of the mountains where we only get about 8" of rain a year it's not so much a question of being protected from the rain as it is being protected from the sun and the dust. I'd love to have a boathouse for our boat but can't justify the ~$200K cost to have one built.
Kevin's boathouse is very much like several at the yacht club we belong to. Many of them have living quarters on a second floor above where the bow end of the slip is and they're very well done.
Mike and Tina
Beachcomber 1995 Sea Ray 550 Sedan Bridge
I'm a huge fan of boat houses. My previous marina in the CA Delta was a boat shed with about 10 boats and one open stern end. (Yes, we all bowed in to minimize exhaust issues in the shed.) Some of us added aft curtains to provide addition protection.
For some, the views are restrictive, some find boat sheds confining, those with little or no exterior wood might not appreciate the difference in boat appearance and maintenance. I found it to be a great balance for us with protection and great views of nature. It wasn't an open view of the distant horizon, but an intimate view of a small island packed with nature. To each his own.