Groundwater, Spring 2016


Below are links to maps of each major groundwater basin showing the wells measured. Each well is labeled as follows:

Well Number: This is a number assigned by the State, for instance 14N-09W-32M1. The well number identifies the well by Township, Range, Section number and by lot within the section (there are 16 lots).

S Avg: This is the average spring (April) water level, typically the highest of the year. Most wells were measured since the early or mid-1960’s, however, some wells have data going back to the late 1940’s and new wells have been added to the network. The long record can document changes in the physical groundwater condition (i.e. downcut stream channels lower the maximum possible groundwater level), changes in irrigation practices (i.e. changes in crop types and irrigation demands), and seasonal impacts (I.e. droughts).

F Avg: This is the average fall (October) water level, typically the lowest of the year.

Spring 2016: This is the water level measured during the period of April 11 and April 13, 2016. If no number is provided, this indicates we were unable to measure the well for some reason (i,e, the pump house was locked).

These maps only tell part of the story of each groundwater basin, as long term groundwater conditions due to changing water use and aquifer conditions can have a substantial effect the average spring and fall levels. Conditions are also different within different areas within a basin. You can view a report summarizing groundwater conditions here. Individual hydrographs of the wells are available on the Groundwater Data page.

S16 Big Valley
S16 Coyote and Collayomi Valley
S16 High Valley
S16 Scotts Valley
S16 Upper Lake

Updated April 20, 2016