Fishing Conditions: GREAT

Report Rating: GREAT
Crowd Rating: Somewhat Crowded
Somewhat Crowded

Fly Fishing Report Date:

Saturday, Sep 14, 2019

Weather & Water Conditions

Weather Water
Temp: 60+ Temp: 56-59
Sky: Clear Flow: 80
Wind: None Clarity: Crystal Clear
Precip: None Runoff: No 

Colorado Stream Update: Streamers are hot!

Current Conditions at Big Thompson:

With Fall on the door-step fish are willing to be slightly more opportunistic. There has been some great streamer action as of late. Small leeches, buggers, and minnows have been moving some great fish. A light nymph rig has been producing a lot of eats. Be sure you are fishing the right depth. Two-bits, PTs, and RS2's are a good place to start. Stimis, and Amy's ants are good for towing a deep nymph. Focus efforts towards side seems, and major current breaks but look for fish to move into riffles throughout the day.

Black streamers have been producing vicious strikes. The water is low and clear and fly fishing reports have been excellent.  The fishing is great.  Clear skies and 60+ degree weather. The water temperature was between 56-59 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: Brown
Weight: 2 lbs 0 oz
Length: 14 inches
Girth: 5 inches
Brown Trout Female Brown Trout Female
Brown Trout Male Brown Trout Male

Current Insect Hatches at Big Thompson

Insect Type: Midge

Insect: Black Midge

Color: Black

Size: 22

Time:

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

Recommended Flies for Big Thompson

Fly: Slump Buster
Color: Brown
Size: 8
Time: 
Slump Buster Slump Buster
Fly: Leech
Color: Black
Size: 6
Time: 
Leech Leech
Fly: Soft Hackle Pheasant Tail
Color: Brown
Size: 18
Time: 
Soft Hackle Pheasant Tail Soft Hackle Pheasant Tail

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:  71 F
Temp Max:  75 F
Temp Min:  62 F
Humidity: 15%
Wind: 16 ESE mph
Pressure: 1019
Clear Sunday 6:00PM — 64 ℉
Expect clear sky with temperatures ranging between 50 and 64 ℉.
Wind: 28 W mph; Humidity: 30%; 
Clear Sunday 9:00PM — 47 ℉
Expect clear sky with temperatures ranging between 37 and 47 ℉.
Wind: 9 SE mph; Humidity: 48%; 
Clouds Monday 6:00AM — 37 ℉
Expect overcast clouds with temperatures ranging between 37 and 37 ℉.
Wind: 16 SSE mph; Humidity: 40%; 
Clouds Monday 9:00AM — 50 ℉
Expect broken clouds with temperatures ranging between 50 and 50 ℉.
Wind: 10 S mph; Humidity: 28%; 
Clouds Monday 12:00PM — 58 ℉
Expect overcast clouds with temperatures ranging between 58 and 58 ℉.
Wind: 22 WSW mph; Humidity: 19%; 
Clouds Monday 3:00PM — 61 ℉
Expect overcast clouds with temperatures ranging between 61 and 61 ℉.
Wind: 14 W mph; Humidity: 17%; 
Clouds Monday 6:00PM — 56 ℉
Expect broken clouds with temperatures ranging between 56 and 56 ℉.
Wind: 11 NW mph; Humidity: 24%; 
Clouds Monday 9:00PM — 40 ℉
Expect broken clouds with temperatures ranging between 40 and 40 ℉.
Wind: 3 SSE mph; Humidity: 37%; 
Clear Tuesday 6:00AM — 35 ℉
Expect clear sky with temperatures ranging between 35 and 35 ℉.
Wind: 12 SSE mph; Humidity: 46%; 
Clear Tuesday 9:00AM — 48 ℉
Expect clear sky with temperatures ranging between 48 and 48 ℉.
Wind: 14 SW mph; Humidity: 32%; 
Clear Tuesday 12:00PM — 56 ℉
Expect clear sky with temperatures ranging between 56 and 56 ℉.
Wind: 36 W mph; Humidity: 24%; 
Clear Tuesday 3:00PM — 58 ℉
Expect clear sky with temperatures ranging between 58 and 58 ℉.
Wind: 39 W mph; Humidity: 22%; 
Clear Tuesday 6:00PM — 53 ℉
Expect clear sky with temperatures ranging between 53 and 53 ℉.
Wind: 30 W mph; Humidity: 30%; 
Clear Tuesday 9:00PM — 41 ℉
Expect clear sky with temperatures ranging between 41 and 41 ℉.
Wind: 11 SW mph; Humidity: 46%;