Henry’s Fork, August 12th, 2023

Headlines from Dr. Rob Van Kirk’s Henry’s Fork drainage water status report filed yesterday.

Yesterday’s mean temp was right at average for this time of year, and water-year precipitation stayed at 108 % of normal.

Lower watershed stream flow is still well above irrigation season targets, so outflow from Island Park Reservoir was reduced to 575 cfs this morning. As natural flow continues to drop, an increase in out flow may happen next week.

Island Park Reservoir is 63.7 % full compared to 60.6 % on average.

Turbidity at Island Park Dam continues to drop , and is at average as of today.

Dr. Rob Van Kirk

Senior Scientist

Henry’s Fork Foundation

There is no significant change in fly fishing conditions since our last report. Mornings and evenings remain the best times for fishing success up and down the river.