Here's another good idea sent me by Sherwood Casjens: Connie, I believe that the Wilson's Snipe makes a "winnowing" sound that can be quite reminiscent of the Boreal owl's call. Snipe winnowing is heard in the Utah Mts (e.g., north slope of Uintas is where I have heard it at night). This may be what you heard at your cabin?? Sherwood Casjens SLC