Colorado River:       

Upper Section

Weekly Overview:

December 2, 2019:

  • Technicality: 2/5

  • Flows on the Upper Colorado have been fairly erratic over the last few days. In general, this is a good thing as it has helped to break up ice along the banks. However, it does make for slightly off colored water. The fishing has been mediocre, but surprisingly good for this time of year. Trout are feeding predominantly below the surface and are keyed in on small midge and baetis patterns. As such, the heavy nymph rig with small and simple patterns should do the trick. The Zebra Midge, Mercury Midge, Jujubaetis, RS2, and Darthbaetis are a few of our favorites. However, don’t go without some of the basics like Copper Johns, Pheasant Tails or Hare’s Ears. This week you are going to want to focus on the deeper runs and pools as sub-freezing temps most the day will leave trout sluggish and looking to expend as little energy as possible. Be persistent and ensure plenty of weight. Don’t be afraid to cover a lot of water either. 

  • Ideal Days to Fish: Monday, Wednesday, Saturday

  • Go to flies: 

    • Surface - Griffiths Gnat (#22-24), Parachute Adams (#22-24)

    • Subsurface - Pat's Rubber Leg (#8-12), Hare's Ear (#18-20), Psycho Prince (#18), Pheasant Tail (#18 - 20), Electric Caddis (#16-18), Sparkle Pupa (#16-18), grey (traditional or flashback) RS2 (#20-22), Zebra Midge (#18-20), Black Beauty (#20-22), Top Secret Midge (#20-22), Manhattan Midge (#20-22), Chocolate Foam Wing Emerger (#20 - 22).

    • Streamers - Slump Busters (#4-6), white Sparkle Minnow (#6), black Wooly Bugger (#4-5), Cheech Leech (#6), Pine Squirrel Leech

      • ​Need flies for your trip? FlyCast has collaborated with our friends at Anglers All ​to package a dozen flies that are hot on the Colorado River right now - Click here for hand selected flies

Upper CO Flow .png
Credit: U.S. Geological Survey 
Department of the Interior/USGS
Willy Upper CO Weather.png
Weather Provided by Weather Underground

Detailed River Info:


The Colorado River, which flows through seven US states and two Mexican states originates in Colorado's Rocky Mountain National Park. There are three sections of river as it pertains to the state of Colorado, the Upper, Middle and Lower. The Upper Colorado is a comparatively large freestone river that originates at the confluence of the Frasier River west of Granby and stretches to the confluence with Troublesome Creek west of Parshall. This picturesque stretch of river, which is lined with cottonwoods and willows, earned its Gold Medal status for its plethora of medium to large sized brown and rainbow trout. 

Fishing on this smooth and meandering section of the Colorado is great for anglers of all skill sets and can be fished most of the year. Feature wise, this section provides everything from shallow riffles and slow runs to deep pools. Nymphing and streamer fishing are both effective, but it is most known for its summer dry fly fishing. During this time, there is an abundance of PMD, Caddis and Stoneflies. However, the Salmon fly hatch is arguably what entices anglers the most. 

River Access:

There are a number of great public access points. The following access points reference Granby as the starting point.

#1: Roughly 4 miles northwest of Granby on US Hwy 40 is a roadside pull off on the left side of the road with access on either side of the river.

#2: 11 miles west on US Hwy 40 to the Town of Hot Sulphur Springs Pioneer Park. From Hwy 40, turn right on CO Rd 20 then left over the bridge. There is a camping a picnic area that provides over a mile of public water on either side of the river. 

#3: 13.1 miles west on Hwy 40 into Byers Canyon there is a parking area on the right hand side of the road and a short trail to the water.

#4: 13.3 miles west on Hwy 40 to the Hot Sulphur Springs State Wildlife Area/Joe Gerrans Area. From Hwy 40 take a left at the east end of the bridge onto CO Rd 50. There is roughly 2,300 acres of water on either side of the river.

#5: 13.4 miles west on Hwy 40 to Hot Sulphur Springs State Wildlife Area/Paul Gilbert Day Area. From Hwy 40 turn left on CO Rd 362. On the right side of the bridge you will find the day use area and a short (1/4 mile) section of public water.

#6: 13.6 miles west on Hwy 40 to Hot Sulphur Springs State Wildlife Area/Lone Buck. From Hwy 40 take a left at the sign for Lone Buck to find camping and a day use area with 2,300 acres of water on either side of the river.

#7: 15. 5 miles west on Hwy 40 to Kemp/Breeze State Wildlife Area. From Hwy 40 take a left on CO Rd 3. The parking lot is 0.7 miles on CO Rd 3 on the right. From there you can take a trail to the Confluence of the Colorado and Williams Fork.

For more detail visit

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