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The Middle Blue River, running between Silverthorne and Green Mountain Reservoir, is one of the least talked about yet highly underrated stretches of water in Summit County. While overshadowed by the famous tailwater below Dillon Dam and the productive flows below Green Mountain, this section offers a mix of riffles, deep runs, and pocket water, holding some solid brown and rainbow trout. The catch? Access is limited, with long stretches of private property, but the public sections can produce surprisingly well.
Winter fishing here is all about finding the deeper, slower-moving water where trout are holding to conserve energy. Flows are low and clear, meaning a stealthy approach and small flies are key. With fewer crowds than the other sections of the Blue, anglers willing to put in the effort can find themselves with some quality water all to themselves.
Conditions Summary
- Flow Rate: 75-125 CFS
- Water Temperature: 34-39°F
- Clarity: Crystal clear
- Best Times: Late morning to mid-afternoon
- Star Rating: ⭐⭐⭐⭐ (Limited access, but productive for those who find the right water)
River Flow Chart
Middle Blue River Hatch Chart (Winter)
| Month |
Primary Hatches |
Effective Patterns |
| December |
Midges |
Black Beauty (#20-24), Top Secret Midge (#20-22) |
| January |
Midges, Baetis |
Zebra Midge (#20-24), RS2 (#18-22) |
| February |
Midges, Baetis |
Mercury Midge (#20-22), Blue Wing Olive (#18-22) |
Top 3 Flies for the Week
- Dry Fly: Parachute BWO (#18-20) – Rare but can be effective on warm afternoons.
- Nymph: Jujubee Midge (#20-24) – The go-to fly for deep, slow runs.
- Streamer: Slump Buster (#8-10) – Stripped slowly near structure for big browns.
Tips for Fly Fishing the Middle Blue River
Seasonal Tip
With low winter flows, trout will be spooky and selective—approach carefully, use long leaders and light tippet (6X-7X) for the best presentation.
Dry Fly
Expect minimal surface action, but if you see midges clustering, try a small Griffith’s Gnat (#20-22) in slow eddies.
Nymphing
A two-fly rig with a midge and a Baetis nymph works best. Focus on deep seams and slower water where trout are holding.
Streamer Fishing
Slow retrieves with small streamers are the best bet for larger fish. Stick to natural colors like olive, black, or tan.
Access Points
Blue River SWA (State Wildlife Area)
- Description: One of the few public stretches between Silverthorne and Green Mountain.
- Why Fish Here: Productive riffles and deep runs with consistent trout activity.
- Locals’ Rating: ⭐⭐⭐⭐
Trough Road Bridge Access
- Description: A lesser-known spot with good pocket water and deeper pools.
- Why Fish Here: Great for stealthy nymphing and a chance to find less pressured fish.
- Locals’ Rating: ⭐⭐⭐⭐
Green Mountain Inlet
- Description: Just upstream of Green Mountain Reservoir, this spot sees better winter fishing conditions.
- Why Fish Here: The water warms slightly, making fish more active.
- Locals’ Rating: ⭐⭐⭐⭐⭐
Local Regulations and Notes on Landowner Rights
- Much of this section is private—be mindful of posted signs and avoid trespassing.
- Public water is limited, but respectful fishing behavior can help maintain access in the future.
This Middle Blue section might not get the hype of its upstream and downstream counterparts, but it has plenty to offer for those looking to explore new water. Want more details or updates? Let me know!