Powder River County, MT Water Table Trend
Powder River County's groundwater trend, from USGS's own readings
Powder River County's long-term well puts the trend at 0.5 ft per decade, holding roughly steady, based on 210 measurements since 1979.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Powder River County's source well, in detail
Depth to water at the last reading was 7.2 ft below land surface. Readings span 1979-12-07 to 2018-08-22, 210 measurements from USGS well USGS-453107106110601 (04s45e04bddb01 Otter), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Powder River County compares nationally
Powder River County sits at rank 364th 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. Powder River County, Montana is home to about 1,734 people. See the fastest-moving counties guide for how Powder River 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 Powder River 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.