This map shows the geographic locations and extents of 8 digit Hydrologic Units in the Upper Mississippi Basin .

Letter sized Download (PDF 4.02MB)

Full Sized 34" X 48" Map (PDF 9.05MB) (Coming Soon)

Upper Mississippi Basin 12 Digit Hydrologic Unit Map

This map shows the geographic locations and extents of 12 digit Hydrologic Units in the Upper Mississippi Basin where data are available.

Letter sized Download (PDF 2.32MB)

Full Sized 34" X 48" Map (PDF 9.05MB) (Coming Soon)