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The Blue River near Silverthorne is a catch-and-release fishery, and anglers are encouraged to use barbless hooks. Respect the private property boundaries along certain sections and use designated public access points. Always carry a valid Colorado fishing license and practice responsible fishing to protect this unique tailwater environment.
Welcome to one of the most iconic fly fishing tailwaters in Colorado. The Blue River in Silverthorne is firing on all cylinders this week, with low, clear flows and aggressive trout feeding below Dillon Reservoir. If you’re hunting trophy rainbow trout in an urban setting, this is your moment.
The early bite has been the most consistent, especially when the sun lights up the riffles below the outlet mall. Trout are actively feeding on midges and PMDs, but don’t expect freebies—these fish have seen it all. Present with precision, fish long leaders and 5X or 6X tippet, and don’t be afraid to downsize.
When clouds roll in, streamer action picks up, especially north of the shopping zone and toward Dillon. And yes—where else can you catch 20-inch trout, grab a cappuccino, and buy a rain jacket all within a five-minute walk?
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Conditions Summary
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- Flow Rate: 105 CFS at Silverthorne
- Water Temp: 44°–48°F
- Air Temp: Mid 60s to low 70s
- Clarity: Crystal clear below Dillon Dam
- Best Time to Fish: 8 AM – 11 AM and after 4 PM
Blue River Hatch Chart
May – July
| Month | Main Hatch | Secondary Hatch | Guide Tip |
|---|---|---|---|
| May | Midges (#20–#24) | Baetis (#18–#22) | Focus near the dam—long leaders, light tippet |
| June | PMDs (#16–#20) | Midges | Be ready for afternoon risers |
| July | Caddis (#14–#18) | PMDs | Skate caddis dries along soft edges |
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Top 3 Flies for the Month
- Dry Fly: Parachute Adams, size 20 – deadly for sippers in slick water
- Nymph: Mercury Midge, size 22 – consistent in tailouts and slow seams
- Streamer: Baby Gonga (white or olive), size 10 – twitch through deep buckets after cloud cover
Tips for Fly Fishing on the Blue River
- Seasonal Tip: Summer fish here are spooky. Stay low, move slow, and match the hatch.
- Dry Fly: Target late-day risers with small mayflies; upstream reach cast is your friend.
- Nymphing: Use tiny midges and tungsten to get deep—focus on technical seams.
- Streamer Fishing: Fish will swipe at white or olive patterns when skies cloud over—focus on undercut banks and deeper slots.
Access Points
1. Silverthorne Outlet Section
- Why Fish Here: Classic urban tailwater action with picky but plentiful trout
- Wading: Easy footing, very popular zone
- View Map Link – ★★★★☆
2. Blue River Trail – Town Stretch
- Why Fish Here: Active hatches, sight-fishing opportunities
- Wading: Moderate wading, slick rocks
- View Map Link – ★★★☆☆
3. Below I-70 – Lower Town Exit
- Why Fish Here: Pocket water and less pressure
- Wading: More technical, variable depending on flow
- View Map Link – ★★★★☆
4. North of Town – Toward Silverthorne Rec Center
- Why Fish Here: Less pressure, spooky fish, technical drifts
- Wading: Beginner-friendly access
- View Map Link – ★★★☆☆
Local Regulations and Notes on Landowner Rights
- Artificial flies and barbless hooks only below Dillon Dam
- Catch-and-release encouraged, especially on large rainbows
- Respect posted signs—many properties downtown are private
- Always check CPW regulations before fishing
FAQ on This Spot
- Is the Blue River in Silverthorne fishable during runoff?
Yes—it's a tailwater, so flows stay relatively stable and clear. - What are the best flies for June?
PMDs, midges, and small streamers like the Baby Gonga or Thin Mint. - Can beginners fish the Blue River?
It’s accessible but technical—great learning ground with some patience. - Do I need a Colorado fishing license here?
Absolutely. Available at CPW online or most local outfitters. - What gear should I bring?
9’ 5wt rod, long leaders, 5X or 6X tippet, and small flies. Bring a net! - Are fish rising right now?
On overcast afternoons, yes—especially to PMDs and tiny parachutes. - Where’s the best place to park?
Outlet mall lots or town trailheads—watch for signage and time limits. - Are there guided trips available?
Yes, several local shops offer half and full-day walk/wade trips.