Henry’s Fork, November 21st, 2023

Headlines from Dr. Rob Van Kirk’s Henry’s Fork Drainage Water Status Report filed Yesterday,11/20

• Light precipitation fell over the weekend as expected; the water-year total is 117% of average.
• Another round of very light precipitation is expected on Thanksgiving Day, and long-term forecasts call for continued dry conditions.
• After flattening out for a few days, natural flow increased a little yesterday in response to precipitation.
• At an average outflow of 230 cfs, Island Park Reservoir gained 472 ac-ft/day over the past three days and is 84% full, compared to 61% full on average.

BWO activity is quickly diminishing on the entire river. It will return to significance sometime next March depending on weather and water conditions, Midge activity remains throughout the year, and under the right conditions can be almost massive at times. So we are entering the time when nymph and streamer patterns are most effective on the entire river.