Fishing Report: Blue River in Silverthorne 10.28.2024

Flowing out of Dillon Reservoir, the Blue River is a well-known tailwater fishery prized for its cold, clear waters and large, wary trout. Below the dam, you'll find trophy-sized rainbow and brown trout, with the best fishing happening in the afternoons as the water warms slightly. Mysis Shrimp and midges are staple food sources, and precise presentations with light tippets are critical.

The river has excellent access points near Silverthorne and Green Mountain Reservoir, with challenging yet rewarding fishing for those willing to put in the effort. Nymphing and small midge patterns are most effective, with occasional streamer action in deeper pools. The Blue River operates under Gold Medal regulations, requiring catch-and-release for certain stretches.

Current River Conditions

The Blue River below Dillon Dam is in classic fall form, with clear, cold flows around 105 CFS that make it a sight-fishing haven. Known for its Mysis shrimp buffet, this stretch is packed with rainbow and brown trout feeding aggressively in preparation for winter. The cool mountain air and stunning fall colors set the perfect backdrop for anglers looking to catch quality tailwater trout without the crowds.

The fish are picky but rewarding, especially with midges, Blue Wing Olives, and the occasional Mysis shrimp snack flowing from the dam. Late morning to mid-afternoon has proven the best window, but stealth and precision are the keys to success in this heavily pressured section.

Conditions Summary

• Flow Rate: 105 CFS
• Water Temperature: 40-45°F
• Clarity: Clear
• Best Times: Late morning to mid-afternoon

For real-time data on river conditions, visit the Colorado Division of Water Resources.

Top 3 Flies for the Week

• Dry Fly: Parachute Adams (#20-24) – Best during afternoon BWO hatches; cast near seams and slower pools.
• Nymph: Black Beauty (#20-24) – An effective midge imitation for deeper water; pairs well with a Mysis shrimp.
• Streamer: Mini Leech (#10-14) – Slow strips along the bottom to entice larger trout lurking near structure.

Tips for Fly Fishing on the Blue River Near Dillon Dam

Seasonal Tip
The colder temperatures and high visibility require a stealthy approach. Use a long leader (9-12 feet) and light tippet (6x) for a natural drift, especially when targeting spooky fish.

Dry Fly
Blue Wing Olives are hatching sporadically on overcast afternoons. Present a Parachute Adams or small BWO pattern in sizes #20-24 to entice trout feeding at the surface.

Nymphing
A two-fly rig with a Mysis shrimp as the lead fly and a small Black Beauty or Zebra Midge as a trailer can be highly effective. Focus on deeper pools and areas near the dam where Mysis shrimp are more abundant.

Streamer Fishing
Although less common, streamer fishing with small leeches or sculpin patterns can provoke strikes from larger trout. Try slow stripping along undercut banks and near structure where fish tend to hide.

Access Points

Silverthorne Outlet Section (Below Dillon Reservoir):

• Description: Popular access with easy entry points directly below the dam offers great sight-fishing opportunities.

• Why Fish Here: Known for its large tailwater trout, thanks to the Mysis shrimp drift from the reservoir.

• Location: [Google Maps link here]

• Locals’ Rating: ⭐⭐⭐⭐⭐.

Silverthorne Town Section

• Description: Provides access along the Blue River Trail through Silverthorne, with multiple points to reach the river.
• Why Fish Here: Conveniently located in town, offering quality fishing in a more urban setting.
• Location: [Google Maps link here]
• Locals’ Rating: ⭐⭐⭐⭐

Blue River Plaza

• Description: A scenic area within the town with riffles and pockets of holding water.
• Why Fish Here: Great for a quick session and often productive for midges and BWOs in fall.
• Location: [Google Maps link here]
• Locals’ Rating: ⭐⭐⭐⭐