Interactive GIS Mapping Tool – Fully Appropriated Stream Systems (FASS) in California

State Water Resources Control Board Division of Water Rights staff have developed a new interactive tool that graphically displays fully appropriated stream systems (FASS) throughout the state. The Division maintains a list of fully appropriated stream systems which has been updated over time, most recently in 1998 through Water Right Order 98-08. Exhibit A of Order 98-08 defines the critical reaches of each FASS listing, including the seasons in which water is unavailable for appropriation. The interactive GIS tool represents a digitized version and staff interpretation of Order 98-08 and Exhibit A. The tool contains separate layers for a) state and federal wild and scenic river stream systems to recognize the restrictions on appropriation of water in the respective State and Federal Wild and Scenic River Acts; and b) medium- and high-priority groundwater basins. How to Use the Interactive Map: After opening the web map, you will need to agree to the disclaimer and click the “OK” box on the splash screen before continuing. Navigate to your point of interest by either using the search tool or by zooming in on the map. To use the search tool, select the down arrow to search by address, stream name, watershed ID, or coordinates, then enter your search criteria. Note that the only searchable stream names are the streams declared fully appropriated and listed in Exhibit A. Click on the map to identify the location of interest and one or more pop-up boxes may appear with information about the fully appropriated stream systems within the general watershed boundaries of the identified location. The information provided in the pop-up box may include: (a) stream name, (b) tributary, (c) season declared fully appropriated, (d) Board Decisions/Water Right Orders, and/or (e) court references/adjudications. Users must keep the FASS Watersheds layer turned on in order to see pop-up boxes. When clicking on a location with overlapping watersheds, make sure to use the arrow to navigate through all pop-up boxes, as shown below. Note that as you click on different watersheds, the outline of the currently selected watershed will appear aqua-colored. You may also find it helpful to use the "Zoom to" link in each pop-up, which will zoom the map to the extent of the selected watershed.