Historic Hood River
This looks like the intake for the aqueduct which carried water from the Copper Dam to the Powerdale power house on the Hood River. Workers had their hands full keeping the ice moving in the winter of 1930. Other images in the series show them chopping up the ice with hand tools. Not sure what they did with that log which is headed towards the pipe, but I’m pretty sure that needed to be diverted before reaching the turbine.