Henry’s Fork, November 8th, 2022
Looks like skis or snowshoes are now standard equipment for fishing much of the Henry’s Fork
Headlines: from Dr. Rob Van Kirk’s Henry’s Fork drainage snow-water analysis report of today.
- Precipitation averaged 0.77 inch across the watershed yesterday, favoring the Ashton/Fall River area.
- New SWE ranged from 0.5 inch to 1.5 inches; the watershed total is over two times average for the date.
- At an outflow of 128 cfs, Island Park Reservoir gained 717 ac-ft yesterday and is 55% full, compared with 57% full on average.
Details:
Precipitation yesterday materialized as forecast. Station totals ranged from 0.33 inch at Rexburg to 1.4 inches at Black Bear SnoTel. The heaviest amounts fell in the Ashton/Fall River area. The watershed average was 0.77 inch, increasing the water-year total to 137% of average. All SnoTel stations received new snow water equivalent. Current SWE is the highest for the date in the 1989-2022 record at Lewis Lake Divide, Pine Creek Pass, and Island Park. Watershed total SWE is over two times the average for the date. An additional 0.25-1 inch of water equivalent is expected over the next two days, before cold, dry weather settles in later in the week.
Natural flow increased yesterday in response to a rain/snow mix early in the day and was 81% of average yesterday.
At an average outflow of 128 cfs, Island Park Reservoir gained 717 ac-ft yesterday, 200 of which was from direct precipitation on the reservoir surface. The reservoir is 55% full, compared with 57% full on average.
Rob Van Kirk, Ph.D.
Senior Scientist
P.O. Box 550
Ashton, ID 83420
208-881-3407 CELL