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The Blue River below Green Mountain Reservoir is a classic Colorado tailwater known for its clear flows, consistent temperatures, and thriving trout population.
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The Lower Blue River below Green Mountain Reservoir is one of those "if you know, you know" fisheries. This tailwater doesn't get as much love as other big-name stretches, but it should—especially in April. Low flows, gin-clear water, and spooky fish mean it’s not a numbers game. But if you’re patient and precise, big wild trout (and the occasional brute of a rainbow) await.
Midges and Baetis are dominating the menu. Nymphing is the name of the game, but on overcast days, don’t be surprised if fish start looking up for BWOs. The canyon offers solitude, some hike-in vibes, and a few technical spots that reward a good drift and perfect fly choice.
Conditions Summary
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Flow Rate: 60–85 CFS (Controlled release from Green Mountain)
Water Temperature: 36–39°F
Clarity: Ultra-clear — approach with stealth
Fishing Pressure: Light to moderate (heavier on weekends)
Wind: Light AM breeze, 10–20 mph gusts in the afternoon
Best Times: 10:30 AM – 2:30 PM
Star Rating: ⭐⭐⭐ (3/5 – Technical tailwater, great for solitude seekers)
📈 River Flow Chart
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Source: USGS Green Mountain Tailwater Gauge
Blue River Hatch Chart (Lower Section)
| Month | Primary Hatches | Effective Patterns |
|---|---|---|
| February (Previous Month) | Midges | Zebra Midge (#20–24), Top Secret Midge (#22), Griffith's Gnat (#22) |
| March (Last Month) | Midges, Baetis | RS2 (#20–22), Blue Wing Olive (#18–22), Pheasant Tail (#18–20) |
| April (Current Month) | Baetis, Midges, Caddis (late) | Barr’s Emerger (#18–20), JuJu Baetis (#20–22), Elk Hair Caddis (#16–18) |
🪶 Top Flies for the Week
- Dry Fly: Blue Wing Olive (#18–20) – Best on overcast days in slower seams.
- Nymph: JuJu Baetis (#20–22) – Money pattern right now, especially trailed behind a Pheasant Tail.
- Streamer: Slump Buster or Sculpzilla (#8–10) – Fish deep, slow, and near structure.
🎣 Tips for Fly Fishing the Lower Blue in April
Seasonal Tip
Expect long casts and picky fish. A long leader, light tippet (5X–6X), and stealthy wading are crucial.
Dry Fly
You might spot risers on cloudy afternoons—especially in slow eddies or seams along rock walls. BWO parachutes or emergers can get eats.
Nymphing
Your best bet. Two-fly rigs with a tungsten anchor (Pheasant Tail, Rainbow Warrior) and a trailing BWO/midge are producing consistently.
Streamer Fishing
Work deep plunge pools with slow, erratic retrieves. Big trout are opportunistic but not aggressive—cover water slowly.
🚗 Access Points
Below Green Mountain Reservoir (Tailwater Parking Area)
Description: Remote tailwater with hike-in canyon access.
Why Fish Here: Cold, clean, consistent water year-round with wild fish.
Locals’ Rating: ⭐⭐⭐
🔥 Hot Spots
- Tailwater Pool just below the dam: Deep, slow water ideal for nymph rigs.
- The Narrows: Technical runs and pocket water—sight fishing possible.
- The Big Bend: Deeper, slower stretch with room to swing a streamer.
⚠️ Local Regulations and Notes on Landowner Rights
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Artificial flies and lures only.
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Barbless hooks recommended (check CPW signage).
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This area is largely public but surrounded by steep canyon walls—watch your step.
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Access requires a short hike—prepare for snow/mud in April.
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Flows fluctuate with dam releases—always check the gauge before heading out.
The Lower Blue in April is a cold, clear, and technical experience. But with solitude, wild fish, and big-river scenery, it’s worth the effort. Bring your A-game and your A-flies—these fish don’t mess around.