Runoff is Fading Fast! Final Streamflow & Summer Fishing Forecast

Runoff is Fading Fast! Final Streamflow & Summer Fishing Forecast

Walter posted his final runoff update and summer fishing forecast over at his website. Check it out.

In brief:

  • The spring runoff is still heavy on most freestone rivers across the northern part of Yellowstone Park and points north. It is basically over in the central and western parts of Yellowstone Park as well as west and northwest of the park. The Madison Basin in particular is now down to something like 30% of its normal snowpack for the date, meaning it’s game on over there.
  • Runoff came early and except for a couple short “runoff breaks,” was quite intense. Now that we’re past peak runoff, the cool spell coming this week will likely drop larger, low-elevation rivers out of the spring runoff to fishable levels for the season, though flows will still be high until about July 4.
  • Winter snowpack was quite high in most area drainage basins, but the early and heavy runoff has melted this snow fast. We now have below-normal snowpack everywhere, drastically below normal in the Madison Basin. This means we’re looking at below normal streamflows for July-September.
  • Area fisheries that are still in spring runoff will drop into play between June 20 and July 4. After that, everything except perhaps the rough lower Yellowstone east of Livingston will be ready to go.
  • Closures related to low water and high water temperatures are certain on the lower Madison River below Ennis Lake and on the Jefferson River. They are unlikely elsewhere. The Firehole River downstream of the Old Faithful closure zone is ALWAYS too warm to fish after about July 1, and this year will be no exception. Why this water isn’t simply closed from July 4 until Labor Day, I have no idea.
  • Other areas that are unlikely to fish well after noon from mid-July until Labor Day are the Gardner River downstream from Boiling River (a hot spring), as well as on the Gibbon and Madison Rivers in YNP. The lower Gallatin River downstream of Gallatin Gateway also falls into this category.
  • It is possible that low flows combined with heat waves in late July and early August will result in poor fishing conditions after 2-3PM on portions of the Yellowstone River outside YNP, especially points east of Livingston. This will be tied to day-to-day weather. A week of 90+ degree highs and sunshine will mean we need to start at 6AM and quit at 2PM, or fish the Yellowstone in the morning and go elsewhere after lunch. I do not anticipate any mandatory “Hoot Owl” restrictions on the Yellowstone.
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