It’s March Madness.

But not the basketball kind.

I’m talking about the kind happening right now on the Provo River.

If you’re anywhere near Park City, Heber City, or Sundance, this is one of the best windows of the year to be fly fishing in Utah. The crowds are light, the fish are feeding, and the rainbows are absolutely fired up.

Here’s what’s really going on.

Middle Provo River – Commit to Going Small

Flows: 141 CFS

The Middle Provo River is in great shape. Stable flows, clear water, classic Provo structure.

But if you show up with size 18s thinking you’re dialed… you’re not.

Right now it’s:

  • Midges 24–26
  • Sow bugs 22–24

Yes, that small.

Fish are sitting in riffles, seams, and slightly deeper runs — and they’re inspecting everything. Long leaders. Light tippet. Clean drifts.

It’s technical fishing. It’s not numbers fishing.

But when you hook a good Middle Provo brown on a size 26 midge? That feels like a win in March Madness.

Lower Provo River – Pre-Spawn Rainbows Are Fired Up

Flows: 135 CFS

The Lower Provo River near Heber City is where things get really fun right now.

Rainbows are in pre-spawn mode. They’re aggressive. They’re territorial. And when they eat, they mean it.

Same fly game as the Middle:

  • Midges 24–26
  • Sow bugs 22–24

But here’s the kicker…

BWO Hatches Around 1 PM

We’re seeing Blue-Winged Olive hatches pop around early afternoon. Small BWOs in sizes 20–22.

And yes — fish are coming up.

There are few better feelings than watching a thick Lower Provo rainbow slide up and sip a tiny dry fly in March while there’s still snow on the banks.

That’s real March Madness.

Weber River Reality Check

Middle Weber River – Give It a Break

Flows: 25 CFS

The Middle Weber River near Park City and Wanship is very low right now.

Honestly? I’d let it rest.

At 25 CFS, fish are limited to faster water and deeper runs. If you do go:

  • Fish small midges (22–24)
  • Small sow bugs (20–24)
  • Stay in oxygen-rich water
  • Handle fish quickly

Low water means fish health matters more than ego.

Lower Weber River – Fish Below Lost Creek

Flows: 0.70 CFS (normal seasonal flow)

The stretch below Echo Reservoir currently has little to no flow. Not worth your time.

If you’re fishing the Lower Weber River near Henefer or Morgan, stay below the Lost Creek confluence.

What’s working:

  • Midges 22–25 (grey, purple, black)
  • Sow bugs 18–22 (grey, tan)

We’ve seen some really nice cutthroat come out of there recently — especially in deeper runs with clean, patient drifts.

Why March Fly Fishing in Utah Is So Good

Here’s the deal.

March fly fishing on the Provo River and Weber River might be the most underrated season in Northern Utah.

  • Pre-spawn rainbows are aggressive
  • Midday BWO hatches create dry fly windows
  • Tailwater flows are stable
  • Way fewer people than summer

This is that sweet spot before spring runoff shifts everything.

If you like technical fishing, strong trout, and earning every eat — March on the Provo River is hard to beat.

If you’re staying in Park City, visiting Sundance, or based in Heber City, this is the time to get out.

March Madness isn’t on TV.

It’s happening in the riffles.

— Brian
Wild Utah Fly Fishing
Guided Fly Fishing Trips on the Provo River & Weber River
Serving Park City, Heber City & Sundance