Polk County, OR Water Table Trend
The nearest real water-table reading to Polk County, OR
Clackamas County, OR, 61 miles from Polk County, is the closest county with a qualifying well, and its water table is holding roughly steady.
No well inside Polk County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Polk County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Clackamas County, OR'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.
About Polk County
Polk County, Oregon covers 741 square miles and is home to about 90,549 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Polk County isn't one of them yet, see the methodology guide for the exact qualifying bar.