Sierra County, CA Water Table Trend
The nearest real water-table reading to Sierra County, CA
The closest qualifying well to Sierra County is 23 miles away in Nevada County, CA, where the trend runs rising, getting shallower over time.
Sierra County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Sierra County's own number. If you own a well here, comparing your own depth log against this regional figure is worth doing before assuming either way. See Nevada County, CA's full page. See the no-data guide for why a county this close to a qualifying well still doesn't get its own number.
Sierra County, California in brief
About 3,113 people live across Sierra County's 953 square miles, in California. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Sierra County isn't one of them yet, see the methodology guide for the exact qualifying bar.