Looking at the map from the page you link to, I see significant amounts of snowpack at the stations above Lake Oroville: https://www.wcc.nrcs.usda.gov/webmap_be

Looking at the map from the page you link to, I see significant amounts of snowpack at the stations above Lake Oroville: https://www.wcc.nrcs.usda.gov/webmap_beta/index.html#version=76&elements=&networks=!&states=!&counties=!&hucs=&minElevation=&maxElevation=&elementSelectType=all&activeOnly=true&activeForecastPointsOnly=false&hucLabels=false&hucParameterLabels=false&stationLabels=&overlays=&hucOverlays=&mode=data&openSections=dataElement,parameter,date,basin,elements,location,networks&controlsOpen=true&popup=FOR:CA:MSNT&base=esriNgwm&displayType=station&basinType=6&dataElement=WTEQ&parameter=PCTMED&frequency=DAILY&duration=I&customDuration=&dayPart=E&year=2017&month=2&day=14&monthPart=E&forecastPubMonth=2&forecastPubDay=1&forecastExceedance=50&seqColor=1&divColor=3&scaleType=D&scaleMin=&scaleMax=&referencePeriodType=POR&referenceBegin=1981&referenceEnd=2010&minimumYears=20&hucAssociations=true&lat=39.6279&lon=-120.8098&zoom=9 https://www.wcc.nrcs.usda.gov/webmap_beta/index.html#version... We see the same thing in NOAA's regional snow analysis maps: https://www.nohrsc.noaa.gov/nsa/?region=Sierras https://www.nohrsc.noaa.gov/nsa/?region=Sierras