2023 · Henry's Fork · January ·

Henry's Fork

Headlines from Dr. Rob Van Kirk's Snow-Water Equivalent Report Compiled Yesterday

  • Yesterday’s watershed-averaged minimum and mean temperatures ended up just a fraction of a degree warmer than those on December 22, but most stations in the watershed set new low-temperature records for the date.
  • Water-year total precipitation is 104% of average, and SWE is at 106% of average.
  • If SWE stays at 106% of average the rest of the winter, expected April-September streamflow will be 90-95% of average.
  • At an outflow of 266 cfs, Island Park Reservoir gained 104 ac-ft yesterday and is 77% full, compared with 75% full on average.

Rob Van Kirk, Ph.D.

Senior Scientist

Henry's Fork Foundation

P.O. Box 550

Ashton, ID 83420


Fly Patterns to use:
Tungsten Zebra Midge Thin Black
Egan’s Rainbow Warrior Pearl
Mayhem Emerger Black
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