Clackamas County, OR Water Table Trend
Is the water table dropping in Clackamas County, OR?
Clackamas County's long-term well puts the trend at 0.2 ft per decade, holding roughly steady, based on 208 measurements since 1958.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Clackamas County's source well, in detail
Depth to water at the last reading was 63.3 ft below land surface. Readings span 1958-05-07 to 2024-12-19, 208 measurements from USGS well USGS-452033122195901 (02s/04e-29dad), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Clackamas County compares nationally
Clackamas County sits at rank 514th of 1,449 ranked counties, ordered rising-to-declining, so a low number means a rising water table and a high one means fast decline. Clackamas County, Oregon is home to about 425,857 people. See the fastest-moving counties guide for how Clackamas County stacks up against the most extreme cases nationally.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Clackamas County can be stable in depth and still worth testing for quality, or declining and still test clean, the two are measured separately, and only a direct test settles the second one.