Williamsport Falls, noon, January 31, 2019. There had been two previous nights of about -16 degree Fahrenheit temperatures. The falls were starting to ice up. In previous cold winters I have seen it as one huge icicle from the top of the falls to the bottom, so this is not as big as it could have been. You can see a mound of ice at the bottom about a third as high as the falls. Also notice the new icicles that have formed underneath the sandstone. These are from water seepage out of the more porous bedrock (I think it is shale). Below a short video of the same scene.
After visiting Williamsport Falls I went to the Potholes, here is a scene from there. To the lower left the trail, normally solid sandstone, was a sheet of ice, so I didn't attempt to get across to the stairs to go any farther.
The view of Big Pine Creek at Twin Bridges, looking upstream.
All photos taken January 31, 2019.