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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.
BLUE RIVER – BELOW GREEN MOUNTAIN
Updated: June 13, 2025
If you’re chasing solitude, strong flows, and hard-pulling trout, the Blue River below Green Mountain Reservoir is your kind of wild. This stretch—remote, rugged, and fly-fishable year-round—is producing well right now, especially with flows stabilizing and water clarity improving.
Expect strong fish and fast water. Nymphing with stonefly patterns and heavy attractors is key. Deep runs and soft seams hold browns and rainbows, especially near tailouts and big boulders. Midday PMD activity is increasing, and streamers are moving aggressive fish near cover. Bring your hiking boots—access is a bit of a workout, but the reward is real.
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Conditions Summary
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- Flow Rate: 575 CFS (variable)
- Water Temp: 46°–52°F
- Air Temp: Mid 60s to 70s
- Clarity: 3–4 feet and improving
- Best Time to Fish: 9 AM – 1 PM and after 5 PM
Hatch Chart – Below Green Mountain
May – July
| Month | Main Hatch | Secondary Hatch | Guide Tip |
|---|---|---|---|
| May | Midges (#20–#22) | Baetis (#18–#20) | Fish slow edges and side channels |
| June | PMDs (#16–#20) | Caddis (#14–#18) | Watch for hatches mid-day near shaded banks |
| July | Golden Stones (#8–#12) | PMDs | Fish big dries early, then nymph deep seams |
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Top 3 Flies for the Month
- Dry Fly: PMD Sparkle Dun, size 16 – deadly on sunny afternoons
- Nymph: Pat’s Rubber Legs, size 10 – heavy, versatile, and irresistible
- Streamer: Mini Dungeon (olive/black), size 6 – swing through tailouts and logjams
Tips for Fly Fishing Below Green Mountain
- Seasonal Tip: Fish early before pressure builds and flows pick up.
- Dry Fly: Target eddies and foam lines late morning when PMDs pop.
- Nymphing: Use two-fly rigs with tungsten stones and small droppers.
- Streamer Fishing: Focus on shady structure, use sink tips or heavy leaders.
Access Points
1. Gore Canyon Trailhead Access
- Why Fish Here: Remote, wild-feeling stretch with technical water
- Wading: Moderate to difficult; rocky terrain and strong flow
- View Map Link – ★★★★☆
2. Confluence with Colorado River
- Why Fish Here: Larger water and confluence dynamics bring big fish
- Wading: Variable depending on flow; caution required
- View Map Link – ★★★☆☆
3. BLM Road Access near Heeney
- Why Fish Here: Lesser-known access with pocket water and structure
- Wading: Moderate; bring boots and good footing
- View Map Link – ★★★★☆
Local Regulations and Landowner Rights
- Public land access is limited—know before you go
- Catch-and-release encouraged in sensitive areas
- Watch for seasonal road closures and wildlife activity
- Always check CPW regulations before heading out
FAQ on This Spot
- Is this section of the Blue River public land?
Much of it is BLM or National Forest, but access can be tricky. Know your boundaries. - Is the fishing better here than in town?
It’s less pressured and wilder—but also more technical and physically demanding. - What’s the best time of year to fish below Green Mountain?
Late spring through early fall is ideal—flows are manageable and bugs are active. - Are streamers effective here?
Yes. Bigger water and deeper structure make this a great streamer stretch. - Do I need waders here?
Yes. Flows are strong and wading is required to reach good water. - Can I camp nearby?
Yes—there are dispersed sites and BLM camping nearby. Pack it in, pack it out. - Is it beginner-friendly?
Not really. This is more of an intermediate to advanced fishery due to terrain and current. - Are there guided trips available for this section?
A few outfitters offer hike-in trips—ask for those who specialize in remote water.