Lake Powell Operations CRFS Spring 2015 March 25, 2015

2 Snow Conditions

3 Mar Mid-Month: 4.85 maf (68%)

4

5

6 Water Year 2015 projections Most: 9.0 maf release Max: 9.0 maf release Min: 9.0 maf release

Unit Number Oct 2014 Nov 2014 Dec 2014 Jan 2015 Feb 2015 Mar 2015 Apr 2015 May 2015 Jun 2015 Jul 2015 Aug 2015 Sep Units Available Capacity (cfs) 14,40021,50018,000 21,40017,700 Capacity (kaf/month) 9101,2801, , ,0701,3201,1101,060 Max (kaf) , Most (kaf) , Min (kaf) , Glen Canyon Power Plant Provisional Unit Outage Schedule for Water Year Projected release, based on January 2015 Min and Max Probable Inflow Projections and 24-Month Study model runs 2Projected release, based on March 2015 Most Probable Inflow Projections and 24-Month Study model runs 6 11,300 18, ,000 14,500 6 (updated ) 6 11,400 18,000 4

Unit Number Oct 2015 Nov 2015 Dec 2015 Jan 2016 Feb 2016 Mar 2016 Apr 2016 May 2016 Jun 2016 Jul 2016 Aug 2016 Sep Units Available Capacity (cfs) 14,50021,200 14,90014,50021,500 21,400 14,300 Capacity (kaf/month) 9001,260 1, ,280 1,2901, Max (kaf) ,0001,1001,2001,300 1,061 Most (kaf) ,0001, Min (kaf) Glen Canyon Power Plant Provisional Unit Outage Schedule for Water Year Projected release, based on January 2015 Min and Max Probable Inflow Projections and 24-Month Study model runs 2Projected release, based on March 2015 Most Probable Inflow Projections and 24-Month Study model runs (updated )

Paria River Discharge Dec 1 though Mar 25 Sediment Conditions As of Sediment Model Results Run on Have: ~68 ktons (as of ) Need: ~235 ktons (for the smallest HFE) 10 Paria River Sand Input Dec 1 though Mar 25  HFE Protocol allows for spring HFEs (March / April) starting in 2015, if sediment inputs are adequate.  Logistics require planning / coordination start 30-days prior to HFE implementation  Currently not enough sediment to support a spring 2015 HFE– highly unlikely to occur.