FLOOD POTENTIAL IN THE EASTERN GREAT BASIN

The following are generalized discussions of the flood potential due to snowmelt in the Eastern Great Basin drainage as of April 1, 1999. Discussions are segregated by state. It is important to understand that the potential for flooding may increase dramatically if snowmelt accelerates rapidly due to above normal temperatures or if significant rain events occur.

UTAH: The potential for flooding due to snowmelt runoff is not high at this time in the Great Salt Lake Basin. The April 1 snowpack is below average at most locations, ranging from 50 to 90 percent of average. The only exception to this is in the Logan River drainage where near average snowpack exists. Peak flows due solely to snowmelt are expected to remain well below flood levels at this time. April-July runoff volumes generally between 55 to 90 percent of average are expected.

The potential for flooding due solely to snowmelt runoff is practically non-existent at this time in the Sevier Lake Basin. Near record low snowpack exists for April 1st, with much of the low and mid elevation snow depleted, and less than 60 percent of average snowpack at isolated higher elevations. April-July runoff volumes are expected to be less than half their average.

 IDAHO: The potential for flooding due to snowmelt runoff is not high at this time in the Bear River Basin of Idaho. The snowpack is near to below average in this area, ranging from 80 to 110 percent of average. At this time flood related problems due solely to snowmelt runoff are not anticipated. April-July runoff volumes are expected to range from 75 to 90 percent of average.