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i Current Geo ra hic . g P Attachment B of Concern The CWCB has objectively assess~d the snowpack and flood threat situation utilizing several key factors. The following information is provided for consideration by response agencies and concerned parties. Criteria for Monitoring Snowpack in Specific Areas 1. Snow Water Equivalent (SWE) of the snowpack within major watersheds • SWE at 12D% of average or greater for watersheds of moderate concern • SWE at 140% of average or greater for watersheds of high concern • SWE at 160% of average or greater for watersheds of extremely high concern 2. History of snowmelt flpoding problems in watershed 3. Timing of likely runoff peak within snowmelt season -still too early to tell, and vvill be based primarily on the absence or presence of spring heat waves Specific Locations of Concern ~_ 1. Entire Rio Grande Bas'lin (Basin SWE at 164% of average) 2. Entire San Miguel, Dolores, Animas, San Juan River Basins (Basin SWE at 152% of average) 3. Entire Gunnison River Basins (Basin SWE at 145% of average) 4. ~ Entire Upper Colorado River Basin (Basin SWE at I29% of average, with some individual subbasins notably higher) . 5. Entire Arkansas River $asin (Basin SWE at 14S% of average) -Note that snowxnelt is not anticipated to cause problems on the Arkansas River mainstem below Pueblo Rest;rvoir 6. One subbasin within the South Platte River Basin • .St. Vrain Creek Basin, tributary to South Platte River (subbasin SWE at 141 % of average) Note: The above. SWE percentages are based on data obtained during the week of March 3, 2008 Supporting GIS-based Snowpack All SNODAS snowpack map 1 S`, 2008 data. These maps sl • Inches of~WE frog • % of average SWE • Hydrologic Unit Cc • Selected streams • Counties and manic These maps have been posted to have been prepared and completed for all major river basins using March ~w the following: SNODAS t SNOTELs (HLTC) subbasin boundaries CWCB website and can be found here: SNODAS mans •