There is a small bar (seasonal) on your left as you reach this junction. There is a larger bar/restaurant just over the river.
As you approach Puente Arnelas you need to follow the arrows that lead you up a steel and wood walkway under the belly of the bridge. At the top, turn right to get up to the road level and follow it into the small village. A short ways on the camino joins the broad Río Umia.