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
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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 Early July

Caddisflies
Insects: Great Gray Spotted Sedge
Color: Gray Green to Olive Brown
Dates: Jun 1 – Jul 15
Emergence: Sporadic
Size: 10-12
Spinner Fall: NA
Great Gray Spotted Sedge Larva illustration
Great Gray Spotted Sedge Emerger illustration
Great Gray Spotted Sedge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Little Plain Brown Sedge
Color: Brown to Chocolate
Dates: Jun 15 – Aug 30
Emergence: Sporadic
Size: 14-16
Spinner Fall: NA
Little Plain Brown Sedge Larva illustration
Little Plain Brown Sedge Emerger illustration
Little Plain Brown Sedge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Little Sister Sedge
Color: Green to Greenish Brown
Dates: May 15 – Aug 30
Emergence: Afternoon & Evening
Size: 14-16
Spinner Fall: NA
Little Sister Sedge Larva illustration
Little Sister Sedge Emerger illustration
Little Sister Sedge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Little Tan Short Horn Sedge
Color: Dark Brown to Yellow
Dates: Mar 1 – Aug 30
Emergence: Sporadic
Size: 14-16
Spinner Fall: NA
Little Tan Short Horn Sedge Larva illustration
Little Tan Short Horn Sedge Emerger illustration
Little Tan Short Horn Sedge Adult illustration
Illustrations © The Flyfisher Group 
Insects: Little Western Dark Sedge
Color: Dark Brown
Dates: Jun 1 – Aug 15
Emergence: Mid Day
Size: 16-18
Spinner Fall: NA
Little Western Dark Sedge Larva illustration
Little Western Dark Sedge Emerger illustration
Little Western Dark 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: 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: Brown Drake
Color: Dark Brown to Blackish
Dates: Jun 15 – Jul 15
Emergence: Evening
Size: 10-12
Spinner Fall: Late Evening
Brown Drake Nymph illustration
Brown Drake Emerger illustration
Brown Drake Adult illustration
Illustrations © The Flyfisher Group 
Insects: Callibaetis Speckled Dun
Color: Tannish Olive to Olive Gray
Dates: Jun 1 – Aug 30
Emergence: Cloudy, Late Morning
Size: 14-16
Spinner Fall: Late Afternoon
Callibaetis Speckled Dun Nymph illustration
Callibaetis Speckled Dun Emerger illustration
Callibaetis Speckled Dun Adult illustration
Illustrations © The Flyfisher Group 
Insects: Early Pale Morning Dun (PMD)
Color: Olivish Yellow to Yellowish Pink
Dates: Jun 1 – Sep 15
Emergence: Mid Morning to Early Afternoon
Size: 16-22
Spinner Fall: Late Evening
Early Pale Morning Dun (PMD) Nymph illustration
Early Pale Morning Dun (PMD) Emerger illustration
Early Pale Morning Dun (PMD) Adult illustration
Illustrations © The Flyfisher Group 
Insects: Ginger Quill
Color: Pale Cream to Whitish
Dates: Jul 1 – Sep 15
Emergence: Morning
Size: 14-16
Spinner Fall: Evening
Ginger Quill Nymph illustration
Ginger Quill Emerger illustration
Ginger Quill 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: Iron Blue Quill
Color: Light Olive Tan to Blue Gray
Dates: Jun 1 – Aug 15
Emergence: Warmest part of day
Size: 20-22
Spinner Fall: Evening
Iron Blue Quill Nymph illustration
Iron Blue Quill Emerger illustration
Iron Blue Quill Adult illustration
Illustrations © The Flyfisher Group 
Insects: Late Pale Morning Dun (PMD)
Color: Creamish Olive to Yellowish
Dates: Jun 15 – Jul 15
Emergence: Early Morning
Size: 16-18
Spinner Fall: After Afternoon
Late Pale Morning Dun (PMD) Nymph illustration
Late Pale Morning Dun (PMD) Emerger illustration
Late Pale Morning Dun (PMD) 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 
Insects: Slate Winged Drake
Color: Brown to Slate Gray
Dates: Jun 15 – Aug 1
Emergence: Early Afternoon
Size: 16-12
Spinner Fall: Evening
Slate Winged Drake Nymph illustration
Slate Winged Drake Emerger illustration
Slate Winged Drake Adult illustration
Illustrations © The Flyfisher Group 
Insects: Western Green Drake
Color: Dark Olive
Dates: Jun 1 – Aug 1
Emergence: Cloudy, 1-4 pm
Size: 8-12
Spinner Fall: Evening
Western Green Drake Nymph illustration
Western Green Drake Emerger illustration
Western Green Drake 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: Giant Golden
Color: Brownish Yellow
Dates: Jun 1 – Aug 1
Emergence: Follows Salmonflies
Size: 14-18
Spinner Fall: NA
Giant Golden Nymph illustration
Giant Golden Adult illustration
Illustrations © The Flyfisher Group 
Insects: Micro Yellow
Color: Greenish Yellow to Yellow
Dates: Jun 1 – Aug 30
Emergence: 46-54° Water Temps Morning
Size: 18-22
Spinner Fall: NA
Micro Yellow Nymph illustration
Micro Yellow Adult illustration
Illustrations © The Flyfisher Group 
Insects: Salmon Fly
Color: Black to Reddish Brown
Dates: May 15 – Jul 15
Emergence: 50-60° Water Late Morning on
Size: 4-8
Spinner Fall: NA
Salmon Fly Nymph illustration
Salmon Fly Adult illustration
Illustrations © The Flyfisher Group 
Insects: Small Western
Color: Brownish
Dates: May 15 – Jul 15
Emergence: 46-56° Water Temps
Size: 14-18
Spinner Fall: NA
Small Western Nymph illustration
Small Western Adult illustration
Illustrations © The Flyfisher Group 
Insects: Winter Black
Color: Black Brown to Reddish Olive, Mottled Brown
Dates: Apr 1 – Aug 15
Emergence: Cold Mountain Streams and Small Ponds
Size: 18-22
Spinner Fall: NA
Winter Black Nymph illustration
Winter Black Adult illustration
Illustrations © The Flyfisher Group 
Insects: Yellow Sally
Color: Pale Yellow to Pinkish Yellow
Dates: Jun 15 – Aug 30
Emergence: Morning to Early Afternoon
Size: 2-8
Spinner Fall: NA
Yellow Sally Nymph illustration
Yellow Sally 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: Dog Day Cicadas
Color: Black & Orange
Dates: Jul 1 – Aug 31
Emergence: Varied
Size:
Spinner Fall: NA
Dog Day Cicadas 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%;