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Surface Water Supply Index (SWSI) Maps and Data from USDA/NRCS, Montana

Abstract: The Surface Water Supply Index (SWSI) was developed by Shafer and
Dezman (1982) to complement the Palmer Index for moisture conditions
across the state of Colorado. The Palmer Index is basically a soil
moisture algorithm calibrated for relatively homogeneous regions, but
it is not designed for large topographic variations across a region
and it does not account for snow accumulation and subsequent
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Related URL
Description: Access to SWSI maps and documentation
Geographic Coverage
Spatial coordinates   
  N: 49.0   S: 45.0   E: -104.0   W: -116.0

Data Set Citation
Dataset Originator/Creator: Shafer and Dezman
Dataset Title: Surface Water Supply Index (SWSI)
Dataset Release Date: 1982-01-01T00:00:00.000Z
Dataset Publisher: USDA/NRCS
Version: Not provided
Online Resource:
Temporal Coverage
Start Date: 1994-01-01
Data Set Progress
Data Center
Natural Resources Conservation Service-Montana, U. S. Department of Agriculture Supplemental Info
Data Center URL:

Data Center Personnel
Phone: (406) 587-6991
Email: rkaiser at
Contact Address:
USDA Natural Resources Conservation Service
10 E. Babcock, Room 443
City: Bozeman
Province or State: Montana
Postal Code: 59715
Country: USA
Distribution Media: ftp, www
Fees: none
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 1970-01-01
Last DIF Revision Date: 2018-11-08