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 March 1, 2000. 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 solely to snowmelt runoff is not high at this time in the Great Salt Lake Basin. Despite a wet period from January through February the snowpack is below average at most locations, particularly at lower elevations. Throughout the Great Salt Lake Basin the snowpack ranges from mostly 60 to 95 percent of average. Snowmelt runoff volumes between 65 to 90 percent of average are expected over most of the area.

The potential for flooding due to snowmelt runoff is not high at this time in the Sevier Lake Basin. Snowpack in this area is also below average, ranging from near 65 to 90 percent in most locations. Snowmelt runoff in the Sevier Lake Basin is expected to range from near 65 to 85 percent of average.

 

IDAHO: The potential for snowmelt flooding in the Bear River Basin of Idaho is not high at this time. The snowpack is below average at most locations, ranging from near 70 to 90 percent of average. Below average snowmelt runoff is anticipated.

It is still too early to make a final evaluation of the flood potential since snow accumulation can continue in the mountains through April. Therefore the flood threat could easily change over the next several weeks.