"The video was posted on the Bureau of Land Management – Alaska “Facebook page Tuesday afternoon and had over 20,000 hits that evening. The social media site is loaded with comments and theories of what the “creature” might be.
Some speculate it could be a rope covered in ice chunks, a giant sturgeon or sea creature of some sort.
MaCaa stated he added sound to the video and slightly sped up its speed but there no alterations to the actual image. The “creature” is estimated to be as long as 15 feet." mysticsciences
I have watched this video over and over. The filmer/government guy was standing on a bridge on the outskirts of Fairbanks, Alaska. The thingy was going upstream and swam under the bridge. He crossed the road on the bridge and watched it proceed upstream.
My guess would be a salt water crocodile who came in the mouth of the river, found the eating good and proceeded upstream. pl