Surface Water Supply Index (SWSI) Maps

These maps are hosted on the Montana Natural Resource Information System (NRIS) web site, and are posted as data becomes available for the months of January through October of the current year.

• Surface Water Supply Index (SWSI) Map Home

To view all maps January through October, click on "See All Months 1992 - Present" located at the tope of the table of maps.

Last Modified: 01/29/2013