U.S. Geological Survey
Environment Canada Climate Information Branch
![National Water Conditions Map - 2002](https://webarchive.library.unt.edu/eot2008/20080921081806im_/http://water.usgs.gov/nwc/NWC/sw/maps/s200204.gif)
Provisional data subject to review.
Data missing for Alabama, Colorado, Illinois, Iowa, Louisiana, Michigan, Missouri,
North Dakota, and Washington.
Map will be updated when data is available.