Fishing Reports

Henry’s Fork August 2nd, 2022

Throughout the river early AMs and evenings remain the best fishing. Thinking of trying the river during weekends? Be ready to share it with recreational floaters.

Headlines from Dr. Rob Van Kirk’s Henry’s Fork drainage report compiled yesterday are below.

 Headlines:

• The daily maximum temperature yesterday was the warmest since July 26 of last year, but cooler temperatures are expected over the next week.
• Diversion and natural flow both dropped a little yesterday, increasing stream flow in lower Fall River and lower Henry’s Fork.
• At 240 cfs, current Crosscut Canal delivery to the Teton River is meeting irrigation demand and stream flow targets there after exchange well pumping was reduced a few days ago.
• Island Park Reservoir is 65% full, compared with 67% full. Outflow reductions are possible this week, depending on stream flow and diversion response to rain and reduction in outflow from Grassy Lake.
• Flow out of Grassy Lake Reservoir will be reduced resulting in a 100 cfs flow reduction in Fall River.

Rob Van Kirk, Ph.D.

Senior Scientist

Henry’s Fork Foundation

P.O. Box 550

Ashton, ID 83420

208-881-3407 CELL

208-652-3568 FAX

Henry’s Fork, July 26th, 2022

Other than spinner falls and caddis activity, we are in the time of the season where terrestrial insects are taking over as a major food form for trout.anywhere you fish the river. Be sure you have patterns for such in that fly box. And as time passes through summer, ant patterns will become of increasing effective among these.

Here are headlines from Dr. Rob Van Kirk’s Henry’s Fork drainage water report filed yesterday AM.

Headlines:  

• Warm, dry weather will continue for the rest of the week.
• Natural flow stayed constant at 63% of average yesterday, while diversion continued to drop and is 88% of average.
• Outflow from Island Park Reservoir was reduced by 100 cfs yesterday, and additional reductions are likely over the next week.

Henry’s Fork, July 23rd, 2022

Box Canyon, Warm River to Ashton, and Ashton Dam to Chester backwater sections are seeing a big increase in recreational floaters. The peak of this activity is usually from late morning to late afternoon. For the latter two locations, this time stretch coincides with the slowest fishing success. Minimize your interaction with these folks by fishing early AMs and during evenings when fishing success is much likely best during these warm days. Everywhere on the river, bank side terrestrial insects are taking over as being a most important food form for foraging trout. Carry fly patterns that simulate them and concentrate your presentations to banks above good holding water.

Here are headlines from Dr. Rob Van Kirk’s Henry’s Fork drainage water report compiled yesterday, July 22nd.

Headlines:  

• Dry weather with temperatures 2-4 degrees F above average is expected to continue for the foreseeable future, as drought redevelops along the northern edge of the watershed.
• Current USGS gage readings are around 80 cfs higher at Island Park and 300 cfs higher at Ashton than actual stream flow.
• At an outflow of 1423 cfs yesterday, Island Park Reservoir is 77% full, right at average for the date.
• No large changes in irrigation-system management are expected for another week or so.

Here are