---
title: Blue River Fly Fishing Report at Dillon Dam –12/4/25
description: Get the most accurate Blue River fly fishing conditions below Dillon Dam. Updated flows, clarity trends, top winter flies, realistic access, and expert rigs for this technical Colorado tailwater.
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---

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# Blue River Fly Fishing Report at Dillon Dam –12/4/25

- December 5, 2025

![Tymothe Meskel](https://risebeyondflyfishing.com/hubfs/Untitled%20design%20(33).png)

[Tymothe Meskel](https://risebeyondflyfishing.com/blog/author/tymothe-meskel)

One of Colorado’s most technical winter tailwaters, running cold and clear right now.

**![blue river between sliverthorne and dillon dam  fly fishing report](https://risebeyondflyfishing.com/hs-fs/hubfs/blue%20river%20between%20sliverthorne%20and%20dillon%20dam%20%20fly%20fishing%20report.png?width=810&height=810&name=blue%20river%20between%20sliverthorne%20and%20dillon%20dam%20%20fly%20fishing%20report.png)**

**Updated: 12/4/2025**

Flows below Dillon Dam remain low and steady, with nearly no week-over-week change. The water is exceptionally clear, forcing trout into deeper, slower lanes and making presentation everything. Feeding windows are narrow but predictable, driven mostly by mid-day midge activity. Crowds have thinned out with colder weather, but the fish remain selective and spooky. Anglers who adjust depth, downsize tippet, and present micro patterns naturally are seeing the best results.

#### **Listen to the Audio Overview**

Blue\_River\_Winter\_Fly\_Fishing\_Secrets

4:17

 

---

## **Conditions Summary**

**![rise beyond fly fihsing company in denver colorado a guide rating for a stream. Good is 5 trout. This rating is for 3 trout. So good or semi challenging fishing conditions.](https://risebeyondflyfishing.com/hs-fs/hubfs/Guide%20Ratings/Guide%20Rating%20(800%20x%20175%20px)%20(3).png?width=800&height=175&name=Guide%20Rating%20(800%20x%20175%20px)%20(3).png)**

**Flow:** Low and stable; no meaningful change this week  
**Water Temperature:** High 30s to low 40s; trending slightly downward  
**Air Temperature:** 20s early, upper 30s mid-day  
**Clarity:** Extremely clear; trout are spooky and selective  
**Crowds:** Low to moderate; winter thins out foot traffic in town  
**Best Window:** 11 am to 3 pm when sunlight hits the canyon and midges pop  
**Fishing Type Focus:** Nymphing with micro patterns, because ultra-clear water forces trout into slow lanes where small midges drift naturally

---

> ### **Weather**

[SILVERTHORNE WEATHER](https://forecast7.com/en/39d63n106d07/silverthorne/?unit=us)

 

Expect frosty mornings, brief mid-day warmth, and canyon shade that keeps water temps low. Cloud cover improves midge emergence and reduces fish spookiness.

---

## **Top Flies in Your Box This Week**

- Mercury Midge 20–22
- Black Beauty 20–24
- Top Secret Midge 22–24
- RS2 Gray 20–22
- Chocolate Thunder 20–22
- JuJu Midge Purple 20–22
- WD40 Brown 20–22
- Rainbow Warrior 20–22
- Bling Midge 20–22
- Mini Leech Black 14

 

 

---

#### **Pro Rig of the Week – The Silverthorne Micro Tailwater Rig**

> **Leader:** 9–10 ft tapered to 6x fluorocarbon  
> **Top Fly:** RS2 Gray 22  
> **Dropper:** Top Secret Midge 24  
> **Indicator:** Small yarn or tiny AirLock set extremely light  
> **Weight:** Micro split-shot only, adjusted for depth constantly  
> **Target Water:** Slow seams, deep troughs, and edges of structure where trout stack tightly in winter clarity

 

---

## **Hatch Chart for December**

| Hatch Type | Bug & Size | Notes |
| --- | --- | --- |
| **Primary** | Midges 20–26 | Strongest mid-day; fish expect small, natural drifts |
| **Secondary** | Baetis 20–22 | Light winter baetis still present on warmer overcast days |
| **Tertiary** | Winter Stones | Rare; mostly subsurface activity |

> #### Download the Blue River Hatch Chart

 

---

## **Access Points**

**Blue River Trail Access (Town Section)**  
Easy access, clear water, spooky trout, highly technical fishing.  
Rating: ⭐⭐⭐

**Below the Dillon Dam Outlet**  
Coldest section but consistent midge drift; the most predictable winter holding water.  
Rating: ⭐⭐⭐⭐

**Silverthorne Factory Outlet Area**  
Narrow lanes, deep slots, and sight-fishing opportunities in clear water.  
Rating: ⭐⭐⭐

**Bike Path Pull-Offs (South)**  
Soft water and deeper holding zones less pressured in winter.  
Rating: ⭐⭐⭐⭐

**North Pond Area Transition Water**  
Wider runs with moderate depth; less foot traffic.  
Rating: ⭐⭐⭐

---

## **Stop Here After the River**

![Photo of stout](https://lh3.googleusercontent.com/gps-cs-s/AG0ilSwy_dwCKZ161sLeAlC2tFfBG55H9op7ZVUu80CLUN5wP6TnKHa2wEuJ6kiGy0PvJ4VZzrvPmCdxhUY2clfDF_fE2lNOoVLT90SOATW5tydeVqbziH04z5BoE_gc3lgii7az3QeM=s680-w680-h510-rw)

**Angry James Brewing Co. (Silverthorne)**  
A relaxed post-river hangout with warm food-truck meals, mountain-town energy, and reliably good beer.  
**What to order:** The Resolute IPA with a rotating hot entrée from the food truck lineup.

---

## **Local Regulations & Notes**

- Tailwater flows can shift with dam operations
- Expect icy banks in shaded areas
- Barbless hooks encouraged for winter handling
- Trout are exceptionally selective in clear water; natural drifts matter

---

## **FAQ**

**Q:** Is this stretch tougher in winter?  
**A:** Yes, due to low flows and extreme clarity.

**Q:** Do I need 6x tippet?  
**A:** Almost always in this section.

**Q:** Can I sight-fish here?  
**A:** Yes, especially during low sun with polarized light.

**Q:** Are streamers productive?  
**A:** Only small leeches fished slow.

**Q:** When does the best midge hatch occur?  
**A:** Mid-day during cloud cover.

**Q:** Do flows change much week to week?  
**A:** Rarely; winter releases remain stable.

---

> ## **Companion Article**
> 
> [**Colorado Winter Trout Feeding Behavior in Clear Tailwaters**](https://risebeyondflyfishing.com/blog/colorado-winter-trout-feeding-behavior-why-micro-nymphs-matter-in-cold-tailwaters)

 

 

 

 Blog Post

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### [Blue River Fly Fishing Report Below Dillon Dam | Summit County Winter Conditions](https://risebeyondflyfishing.com/blog/winter-fly-fishing-report-blue-river-below-dillon-dam-silverthorne-colorado)

 December 31, 2025

 The Blue River below Dillon Dam is one of Colorado’s most technical tailwaters, and winter strips it down to pure...

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### [Blue River Fly Fishing Report Below Dillon 12/10/25](https://risebeyondflyfishing.com/blog/blue-river-fly-fishing-report-below-dillon-12/10/25)

 December 10, 2025

 The tailwater is running low and stable, clarity is exceptional, and trout are holding deep in slow technical slots....

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[![Get the latest Blue River fly fishing report with up-to-date water conditions, recommended flies, and tips for nymphing, dry fly, and streamer fishing in Colorado’s clear tailwaters.](https://risebeyondflyfishing.com/hubfs/Colorado%20Stream%20Fly%20Fishing%20Reports%20(12).png)](https://risebeyondflyfishing.com/blog/blue-river-fly-fishing-report-below-dillon-dam-12/31/25)

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### [Blue River Fly Fishing Report Below Dillon Dam 12/31/25](https://risebeyondflyfishing.com/blog/blue-river-fly-fishing-report-below-dillon-dam-12/31/25)

 December 31, 2025

 The Blue River below Dillon Dam is one of Colorado’s most technical tailwaters, and winter strips it down to pure...

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