Woman awoken from her bed by unusual animal call in Chilliwack witnessed in British Columbia, Canada

Open Map

Just after 2:00 AM on June 14, 2012 I was woken up by a very loud whooping/howling sound coming from what sounded like the Vedder River in Chilliwack, BC, Canada. I had my window open which is why I think it actually woke me up. I live about 4 blocks north of the Vedder River and the sound was nothing like I had ever heard before. It definitely was not human and I couldn't identify it as an animal I had ever heard before. The sound/call lasted for about 15 minutes. There were no other animal sounds associated. It was eerily quiet actually besides this noise. After 15 minutes it stopped. About 10 to 20 minutes later I heard the same call a couple times but it sounded farther away. I listened to the 1978 Whoop-Howl from Snohomish County, Washington, USA on your website and the sound is virtually identical (besides the echo) to what I heard.