This graph measures water levels downstream from Argo Dam. Water levels are not supposed to fluctuate this much - it's not good for the river.
Update: I checked with USGS to make sure that the gauges were working fine, and got back this result:
We're pretty certain everything is working just fine there. I believe we have a hydrologic technician there today making a streamflow measurement and he'll verify the operation of the equipment at the same time. Tom