SLCESGNM TTAA00 KSLR DDHHMM NATIONAL WEATHER SERVICE COLORADO BASIN RIVER FORECAST CENTER SALT LAKE CITY UT APR 4, 2007 INTERNAL NWS PRODUCT FOR GUIDANCE PURPOSES ONLY SAN JUAN RIVER BASIN SPRING FLOOD POTENTIAL OUTLOOK The 2007 spring runoff flood potential is not high at this time for streams and rivers throughout the San Juan River Basin. The observed water year precipitation to date is 90% of average. Snow water equivalent as of April 1 was 71% in the Upper San Juan, 58% in the Animas, and 65% for the entire San Juan Basin. It is important to note that the spring flood threat due to runoff will largely be determined by hydrometeorologic events that occur during the next several months. If current patterns persist then we will have a very low threat of spring flooding from snow melt runoff. Computed peak flows for three selected points are as follows: 2006 2007 River/Site Peak/Date Fcst Peak Normal Peak Historic Peak CFS CFS Period CFS ___________ _________ _________ ___________ ____________ San Juan - 1420, 5/21 1650 5/15 - 6/12 4640 Pagosa Springs Animas - 3140, 5/25 3100 5/28 - 6/14 10700 Durango Animas - 3130 5/25 3200 5/31 - 6/15 11000 Farmington San Juan - 7070, 6/9 7100* 5/21 - 7/4 15600 Bluff * - Peak flow forecast on the San Juan below Navajo Reservoir include the maximum spring releases for 2007 by 28 days of ramping up to 5000 cfs, 21 days at 5000 cfs and 14 days ramping down to 500 cfs. The release should start sometime around the end of April and decrease to 500 cfs by around the middle of June. CBRFC/tjc NNNN $$