Fishing Conditions: GOOD

Report Rating: GOOD
Crowd Rating: Somewhat Crowded
Somewhat Crowded

Fly Fishing Report Date:

Sunday, Dec 15, 2019

Weather & Water Conditions

Weather Water
Temp: 32-35 Temp: 32-35
Sky: Clear Flow: 550
Wind: None Clarity: Crystal Clear
Precip: None Runoff: No 

Colorado Stream Update: The Juan is fishing well into winter

Current Conditions at San Juan:

Winter has arrived, and the Juan is a good choice for those looking to find some fish. The nights are getting pretty cold so expect fish to take a minute in the morning to get going. As the sun warms the water, look for trout to key in on small BWO emergers and midges. Nymph-rigs fished at the appropriate depth are going to find the most fish. There are plenty of opportunities to take fish on the surface still, with decent hatches of Baetis and Midges given the right conditions. Streamer action has been picking up slightly as well. The quality section of the San Juan sees a lot of pressure and after a whole season of fishing, trout are even more selective. Line management, depth and tippet size are all variables to consider. Tippet sizes upwards of 5x are most likely necessary.

The fishing is good.  Clear skies and 32-35 degree weather. The water temperature was between 32-35 degrees and Crystal Clear.

Angling University: Up your game.
The Flyfisher Guide Service
The Colorado Trout Fisher Guide Service
Colorado Fly Fishing Trips with
Colorado Trout Fisher
Denver and Boulder Fly Fishing Guides
Colorado Trout Fisher logo

BOOK A TRIP

Trip Includes:
  • Flies and fishing tackle
  • Rods/reels
  • Waders
  • Lunch
  • Transportation
$225 for 1 or 2 people
$295 for 3 people
Angling University: Anyone can learn to fish.
The Flyfisher Guide Service: Get out and fish.

Likely Catch

Species: Rainbow
Weight: 3 lbs 0 oz
Length: 18 inches
Girth: 8 inches
Rainbow Trout Female Rainbow Trout Female
Rainbow Trout Male Rainbow Trout Male

Current Insect Hatches at San Juan

Insect Type: Midge

Insect: Black Midge

Color: Black

Size: 24

Time:

Black Midge Larva Illustration
Black Midge Emerger Illustration
Black Midge Adult Illustration

Recommended Flies for San Juan

Fly: Wd 40
Color: Olive
Size: 24
Time: 
Wd 40 Wd 40
Fly: Disco Midge
Color: Red
Size: 22
Time: 
Disco Midge Disco Midge
Fly: Dorsey's Top Secret Midge
Color: Brown
Size: 22
Time: 
Dorsey's Top Secret Midge Dorsey's Top Secret Midge

Colorado Hatch Conditions for Late September

Caddisflies
Insects: Green Sedge
Color: Olive to Gray Brown
Dates: Jul 15 – Sep 30
Emergence: Morning & Afternoon
Size: 12-14
Spinner Fall: NA
Green Sedge Larva illustration
Green Sedge Emerger illustration
Green Sedge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Little Black Sedge
Color: Chocolate to Black
Dates: Jul 15 – Sep 30
Emergence: Sporadic
Size: 16-18
Spinner Fall: NA
Little Black Sedge Larva illustration
Little Black Sedge Emerger illustration
Little Black Sedge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Micro Caddis
Color: Yellow, Orange or Brown
Dates: Jun 15 – Oct 15
Emergence: Sporadic
Size: 20-22
Spinner Fall: NA
Micro Caddis Larva illustration
Micro Caddis Emerger illustration
Micro Caddis Adult illustration
Illustrations © The Flyfisher Group 
Insects: October Caddis
Color: Orange Tan to Grayish Black
Dates: Sep 1 – Oct 30
Emergence: Shallows, Afternoon & Evening
Size: 8-10
Spinner Fall: NA
October Caddis Larva illustration
October Caddis Emerger illustration
October Caddis Adult illustration
Illustrations © The Flyfisher Group 
Insects: Spotted Sedge
Color: Brownish Yellow
Dates: May 15 – Sep 30
Emergence: Sporadic
Size: 10-12
Spinner Fall: NA
Spotted Sedge Larva illustration
Spotted Sedge Emerger illustration
Spotted Sedge Adult illustration
Illustrations © The Flyfisher Group 

Mayflies
Insects: Blue Winged Olive
Color: Light Olive Brown to Brown Olive
Dates: Mar 1 – Nov 15
Emergence: Clouds & warmest part of day
Size: 16-18
Spinner Fall: Evening
Blue Winged Olive Nymph illustration
Blue Winged Olive Emerger illustration
Blue Winged Olive Adult illustration
Illustrations © The Flyfisher Group 
Insects: Gray Drake
Color: Gray
Dates: Jun 1 – Nov 30
Emergence: Late Morning
Size: 14-16
Spinner Fall: Evening
Gray Drake Nymph illustration
Gray Drake Emerger illustration
Gray Drake Adult illustration
Illustrations © The Flyfisher Group 
Insects: Mahogany Dun
Color: Reddish Brown to Blackish Brown
Dates: Sep 1 – Oct 31
Emergence: Early Afternoon
Size: 16-18
Spinner Fall: Late Evening
Mahogany Dun Nymph illustration
Mahogany Dun Emerger illustration
Mahogany Dun Adult illustration
Illustrations © The Flyfisher Group 
Insects: Micro Blue Winged Olive (BWO)
Color: Pale Olive Green to Blue Gray
Dates: Jun 1 – Nov 30
Emergence: Clouds & warmest part of day
Size: 22-26
Spinner Fall: Evening
Micro Blue Winged Olive (BWO) Nymph illustration
Micro Blue Winged Olive (BWO) Emerger illustration
Micro Blue Winged Olive (BWO) Adult illustration
Illustrations © The Flyfisher Group 
Insects: Red Quill
Color: Reddish Brown
Dates: Jun 15 – Sep 30
Emergence: Mid Morning
Size: 14-16
Spinner Fall: Evening
Red Quill Nymph illustration
Red Quill Emerger illustration
Red Quill Adult illustration
Illustrations © The Flyfisher Group 

Midges
Insects: Black Midge
Color: Blackish to Black
Dates: Apr 1 – Nov 15
Emergence: All Day
Size: 18-20
Spinner Fall: 2-3 Hours
Black Midge Larva illustration
Black Midge Emerger illustration
Black Midge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Chocolate Brown Midge
Color: Brown to Chocolate
Dates: Feb 15 – Dec 15
Emergence: All Day
Size: 20-22
Spinner Fall: 2-3 Hours
Chocolate Brown Midge Larva illustration
Chocolate Brown Midge Emerger illustration
Chocolate Brown Midge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Micro Black Midge
Color: Blackish to Black
Dates: Mar 1 – Nov 15
Emergence: Morning
Size: 22-26
Spinner Fall: 2-3 Hours
Micro Black Midge Larva illustration
Micro Black Midge Emerger illustration
Micro Black Midge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Snow Midge
Color: Gray to Charcoal
Dates: Jan 1 – Dec 31
Emergence: Warmest part of day
Size: 24-28
Spinner Fall: 2-3 Hours
Snow Midge Larva illustration
Snow Midge Emerger illustration
Snow Midge Adult illustration
Illustrations © The Flyfisher Group 

Stoneflies
Insects: September Stone
Color: Reddish Brown with Orange belly
Dates: Aug 15 – Oct 31
Emergence: Early Afternoon to Evening
Size: 4-10
Spinner Fall: NA
September Stone Nymph illustration
September Stone Adult illustration
Illustrations © The Flyfisher Group 

Terrestrials
Insects: Beetle
Color: Brownish to Black
Dates: May 1 – Nov 30
Emergence: All Day
Size: 10-18
Spinner Fall: NA
Beetle illustration
Illustrations © The Flyfisher Group 
Insects: Black & Red Ant
Color: Red & Black
Dates: Jul 1 – Sep 30
Emergence: All Day
Size: 18-20
Spinner Fall: NA
Black & Red Ant illustration
Illustrations © The Flyfisher Group 
Insects: Black Ant
Color: Black
Dates: May 1 – Nov 15
Emergence: All Day
Size: 20-24
Spinner Fall: NA
Black Ant illustration
Illustrations © The Flyfisher Group 
Insects: Cricket
Color: Brownish Olive to Black
Dates: Jun 1 – Nov 30
Emergence: Twilight & Dusk
Size: 8-16
Spinner Fall: NA
Cricket illustration
Illustrations © The Flyfisher Group 
Insects: Grasshopper
Color: Green to Brownish Tan
Dates: May 15 – Nov 15
Emergence: All Day
Size: 2-14
Spinner Fall: NA
Grasshopper illustration
Grasshopper illustration
Illustrations © The Flyfisher Group 
Insects: Red Ant
Color: Red to Orangish
Dates: May 1 – Oct 15
Emergence: All Day
Size: 18-22
Spinner Fall: NA
Red Ant illustration
Illustrations © The Flyfisher Group 


Current Conditions

Clear
Currently: Clear Sky
Temperature:  41 F
Temp Max:  46 F
Temp Min:  36 F
Humidity: 23%
Wind: 54 WNW mph
Pressure: 1015
Clear Monday 5:00PM — 35 ℉
Expect clear sky with temperatures ranging between 35 and 35 ℉.
Wind: 48 WNW mph; Humidity: 29%; 
Clear Monday 8:00PM — 28 ℉
Expect clear sky with temperatures ranging between 28 and 28 ℉.
Wind: 14 NW mph; Humidity: 44%; 
Clear Monday 11:00PM — 26 ℉
Expect clear sky with temperatures ranging between 26 and 26 ℉.
Wind: 10 NNW mph; Humidity: 47%; 
Clear Tuesday 2:00AM — 25 ℉
Expect clear sky with temperatures ranging between 25 and 25 ℉.
Wind: 19 WNW mph; Humidity: 44%; 
Clear Tuesday 5:00AM — 22 ℉
Expect clear sky with temperatures ranging between 22 and 22 ℉.
Wind: 25 NNW mph; Humidity: 41%; 
Clear Tuesday 8:00AM — 23 ℉
Expect clear sky with temperatures ranging between 23 and 23 ℉.
Wind: 28 NNW mph; Humidity: 36%; 
Clouds Tuesday 11:00AM — 31 ℉
Expect few clouds with temperatures ranging between 31 and 31 ℉.
Wind: 33 NNW mph; Humidity: 18%; 
Clouds Tuesday 2:00PM — 33 ℉
Expect overcast clouds with temperatures ranging between 33 and 33 ℉.
Wind: 29 NNW mph; Humidity: 19%; 
Clouds Tuesday 5:00PM — 32 ℉
Expect broken clouds with temperatures ranging between 32 and 32 ℉.
Wind: 22 NNE mph; Humidity: 23%; 
Clear Tuesday 8:00PM — 25 ℉
Expect clear sky with temperatures ranging between 25 and 25 ℉.
Wind: 13 NNE mph; Humidity: 41%; 
Clear Tuesday 11:00PM — 23 ℉
Expect clear sky with temperatures ranging between 23 and 23 ℉.
Wind: 6 NE mph; Humidity: 45%; 
Clear Wednesday 2:00AM — 21 ℉
Expect clear sky with temperatures ranging between 21 and 21 ℉.
Wind: 10 ENE mph; Humidity: 44%; 
Clear Wednesday 5:00AM — 20 ℉
Expect clear sky with temperatures ranging between 20 and 20 ℉.
Wind: 9 ENE mph; Humidity: 41%; 
Clear Wednesday 8:00AM — 21 ℉
Expect clear sky with temperatures ranging between 21 and 21 ℉.
Wind: 7 ENE mph; Humidity: 33%; 
Clear Wednesday 11:00AM — 29 ℉
Expect clear sky with temperatures ranging between 29 and 29 ℉.
Wind: 7 WSW mph; Humidity: 25%; 
Clear Wednesday 2:00PM — 36 ℉
Expect clear sky with temperatures ranging between 36 and 36 ℉.
Wind: 19 W mph; Humidity: 23%; 
Clear Wednesday 5:00PM — 37 ℉
Expect clear sky with temperatures ranging between 37 and 37 ℉.
Wind: 23 SW mph; Humidity: 27%; 
Clear Wednesday 8:00PM — 28 ℉
Expect clear sky with temperatures ranging between 28 and 28 ℉.
Wind: 9 S mph; Humidity: 43%; 
Clear Wednesday 11:00PM — 27 ℉
Expect clear sky with temperatures ranging between 27 and 27 ℉.
Wind: 4 E mph; Humidity: 45%; 
Clear Thursday 2:00AM — 25 ℉
Expect clear sky with temperatures ranging between 25 and 25 ℉.
Wind: 5 ENE mph; Humidity: 50%;