River Basin PDSI

Click on the map below, or on a basin at right to see the historical PDSI values for that particular basin.

1. New England Basin
2. Mid-Atlantic Basin
3. South Atlantic Gulf Basin
4. Great Lakes Basin
5. Ohio Basin
6. Tennessee Basin
7. Upper Mississippi Basin
8. Lower Mississippi Basin
9. Souris–Red–Rainy Basin
10. Missouri Basin
11. Arkansas–White–Red Basin
12. Texas Gulf Basin
13. Rio Grande Basin
14. Upper Colorado Basin
15. Lower Colorado Basin
16. Great Basin
17. Pacific Northwest Basin
18. California Basin