1. Colorado River Basin Water Supply Out look Lake Powell Lake Mead

2. La Nina Years ? ! ? Good ? Bad ? Good - Water Year 2011 Bad – Water Year 2012

5. Upper Colorado River Basin Lower Colorado River Basin Lake Powell Lake Mead

6. Upper Colorado River Basin Lower Colorado River Basin Lake Mead Lake Powell

7. Colorado River Basin Water Supply Outlook

8. 2012 Final Forecast

9. State of the System (1999-2012) 1

10. Colorado River Basin Water Supply Outlook ● April to June 2012 Inflow Into Lake Powell – 2.36 MAF (33% of Normal – 3 rd lowest on record [1909 to 2011]). (April to June Observed 2011 Inflow Into Lake Powell – 12.89 MAF (162% of Normal). ● Water Year 2012 Inflow Into Lake Powell – y 6 MAF (51% of Normal) (Water Year 2011 Inflow into Lake Powell – 15.97 MAF [139% of Normal]). ● Water Year 2012 Release from Lake Powell – 9.46 MAF Release to the Lower Basin (1.23 MAF “Equalization” Carryover from Water Year 2011 plus 8.23 MAF minimum objective release per 2007 Interim Guidelines). ● Lake Powell and Lake Mead Storage will generally decline through 2013.

11. Colorado River Basin Water Supply Outl ook

12. First Shortage Elevation Colorado River Basin Water Supply Outl ook

13. Lake Powell Lake Mead Total Reservoir System Contents: 37.1 MAF or 62% (As of May 7, 2012) Total Reservoir System Contents Last Year: 31.6 MAF or 53%

14. LAKE POWELL Capacity – 24.5 MAF 05/07/2012 - 64% full Contents 15.5 MAF Elevation – 3,636’ Glen Canyon Dam Page Colorado River Basin Water Supply Outlook

15. LAKE MEAD Capacity - 26 MAF 05/07/2012 - 53% full Contents – 13.9 MAF 05/07/2012 - 53% full Contents – 13.9 MAF Elevation – 1,123’ Elevation – 1,123’ Hoover Dam Las Vegas Colorado River Basin Water Supply Outlook

16. Source: Bureau of Reclamation Lower Colorado River Basin Chance of a Shortage or Surplus

17. Key Operational Elevations – Interim Period FLOOD CONTROL OR QUANTIFIED SURPLUS (“70R”) 1145’ (56% full) 1000’ (16% full) 915’ (2% full) 1220’ (95% full) 1200’ (84% full) DOMESTIC SURPLUS NORMAL OPERATIONS Lake Mead 1050’ (27% full) 895’ (0% full) Minimum Power Pool and Bottom of First SNWA Intake Bottom of Second SNWA Intake Minimum Mead Intake Elevation Top of Dead Storage 1075’ (34% full) 400 KAF SHORTAGE (333 KAF to U.S.) (320 KAF to Arizona) RECONSULTATION (For Additional Shortages) 1025’ (21% full) 500 KAF SHORTAGE (417 KAF to U.S.) (400 KAF to Arizona) 600 KAF SHORTAGE (500 KAF to U.S.) (480 KAF to Arizona)

18. What About Next Year? La Nina Year ? ! ? El Nino Year ? ! ? El Nino La Nina

19. What About Next Year? La Nina Year ? ! ? El Nino Year ? ! ? El Nino La Nina El Nino La Nina

20. What About Next Year? La Nina Year ? ! ? El Nino Year ? ! ?

21. The Earth’s Water As A Sphere Diameter of the Water Sphere 860 Miles 321 million cubic miles of water Source: USGS Water Science for Schools: http://ga.water.usgs.gov/edu/eatrhhowmuch.html