Fishing Conditions: FAIR

Report Rating: FAIR
Crowd Rating: Somewhat Crowded
Somewhat Crowded

Fly Fishing Report Date:

Tuesday, Apr 28, 2020

Weather & Water Conditions

Weather Water
Temp: 60+ Temp: 44-47
Sky: Clear Flow: 207
Wind: None Clarity: Slightly Off
Precip: None Runoff: No 

Colorado Stream Update: Fishing on the St. Vrain is ok right now.

Current Conditions at Saint Vrain:

For best success try fishing in Lyons and Longmont. Water is still cold but it is slowly heating up. Nymphing is producing the most fish but we are seeing the BWO's coming off so make sure do bring a few dries with you.

The fishing is fair.  Clear skies and 60+ degree weather. The water temperature was between 44-47 degrees and Slightly Off.

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: Brown
Weight: 0 lbs 10 oz
Length: 12 inches
Girth: 4 inches
Brown Trout Female Brown Trout Female
Brown Trout Male Brown Trout Male

Current Insect Hatches at Saint Vrain

Insect Type: Mayfly

Insect: Blue Winged Olive

Color:

Size:

Time:

Blue Winged Olive Emerger Illustration
Blue Winged Olive Nymph Illustration
Blue Winged Olive Adult Illustration

Recommended Flies for Saint Vrain

Fly: Carp Fly
Color: 
Size: 
Time: 
Carp Fly Carp Fly
Fly: Parachute Blue Winged Olive
Color: 
Size: 
Time: 
Parachute Blue Winged Olive Parachute Blue Winged Olive
Fly: Prince Nymph
Color: 
Size: 
Time: 
Prince Nymph Prince Nymph

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

Clouds
Currently: Overcast Clouds
Temperature:  35 F
Temp Max:  41 F
Temp Min:  17 F
Humidity: 27%
Wind: 39 W mph
Pressure: 1015
Snow Monday 5:00PM — 27 ℉
Expect light snow with temperatures ranging between 11 and 27 ℉.
Wind: 47 WNW mph; Humidity: 75%;  Snow: 0.19 for next 3 hours.
Clouds Monday 8:00PM — 18 ℉
Expect scattered clouds with temperatures ranging between 6 and 18 ℉.
Wind: 27 W mph; Humidity: 82%; 
Clouds Monday 11:00PM — 13 ℉
Expect broken clouds with temperatures ranging between 5 and 13 ℉.
Wind: 27 W mph; Humidity: 82%; 
Clouds Tuesday 2:00AM — 7 ℉
Expect overcast clouds with temperatures ranging between 3 and 7 ℉.
Wind: 24 W mph; Humidity: 83%; 
Clouds Tuesday 5:00AM — 0 ℉
Expect overcast clouds with temperatures ranging between 0 and 0 ℉.
Wind: 20 W mph; Humidity: 86%; 
Clouds Tuesday 8:00AM — 3 ℉
Expect broken clouds with temperatures ranging between 3 and 3 ℉.
Wind: 20 W mph; Humidity: 81%; 
Clouds Tuesday 11:00AM — 9 ℉
Expect overcast clouds with temperatures ranging between 9 and 9 ℉.
Wind: 17 NW mph; Humidity: 73%; 
Snow Tuesday 2:00PM — 13 ℉
Expect light snow with temperatures ranging between 13 and 13 ℉.
Wind: 11 NNE mph; Humidity: 76%;  Snow: 0.38 for next 3 hours.
Snow Tuesday 5:00PM — 9 ℉
Expect light snow with temperatures ranging between 9 and 9 ℉.
Wind: 6 SSE mph; Humidity: 90%;  Snow: 0.5 for next 3 hours.
Clouds Tuesday 8:00PM — -1 ℉
Expect broken clouds with temperatures ranging between -1 and -1 ℉.
Wind: 16 W mph; Humidity: 89%; 
Clouds Tuesday 11:00PM — -1 ℉
Expect scattered clouds with temperatures ranging between -1 and -1 ℉.
Wind: 23 W mph; Humidity: 86%; 
Clouds Wednesday 2:00AM — -1 ℉
Expect scattered clouds with temperatures ranging between -1 and -1 ℉.
Wind: 30 W mph; Humidity: 85%; 
Clouds Wednesday 5:00AM — -0 ℉
Expect scattered clouds with temperatures ranging between -0 and -0 ℉.
Wind: 34 W mph; Humidity: 79%; 
Clouds Wednesday 8:00AM — 5 ℉
Expect few clouds with temperatures ranging between 5 and 5 ℉.
Wind: 38 W mph; Humidity: 68%; 
Clear Wednesday 11:00AM — 17 ℉
Expect clear sky with temperatures ranging between 17 and 17 ℉.
Wind: 35 W mph; Humidity: 65%; 
Clouds Wednesday 2:00PM — 23 ℉
Expect scattered clouds with temperatures ranging between 23 and 23 ℉.
Wind: 33 W mph; Humidity: 62%; 
Clouds Wednesday 5:00PM — 19 ℉
Expect few clouds with temperatures ranging between 19 and 19 ℉.
Wind: 30 W mph; Humidity: 74%; 
Clouds Wednesday 8:00PM — 15 ℉
Expect few clouds with temperatures ranging between 15 and 15 ℉.
Wind: 33 W mph; Humidity: 79%; 
Clouds Wednesday 11:00PM — 15 ℉
Expect few clouds with temperatures ranging between 15 and 15 ℉.
Wind: 39 W mph; Humidity: 78%; 
Clouds Thursday 2:00AM — 16 ℉
Expect scattered clouds with temperatures ranging between 16 and 16 ℉.
Wind: 46 W mph; Humidity: 77%;