Groundwater, Fall 2015


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.

Fall 2015: This is the water level measured during the period of September 30 through October 2, 2015. 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.

F15 Big Valley
F15 Coyote-Collayomi Valleys
F15 High Valley
F15 Scotts Valley
F15 Upper Lake Valley

Updated April 15, 2016