The ice collected on both sides of the river over the course of the day today; here's a simple animation.
Looking back at this blog's archives, I noted the ice formation at Koyuk on the following dates in previous years:
October 24, 2013
October 9-11, 2014
October 18-20, 2017
October 14, 2019
October 14, 2022
In other news, it was 0°F at Anaktuvuk Pass this morning, and nearly as cold at some of the interior RAWS sites: +1°F at Norutak Lake and +2°F at the Beaver RAWS in the Yukon Flats.
And yesterday the rarely-operational Galbraith Lake thermometer reported -8°F on the north side of the Brooks Range. This appears to have been the first sub-zero temperature of the season observed in Alaska.