Blue Stream Fly Fishing
Fly Fishing Report for:

North St. Vrain - Below Button Rock - Colorado

Hatch Chart - Best Access/Spots - Local Fish - About

Water Flow Chart

Using Water Flow Charts & Weather Reports: Begin with our water flow charts to grasp stream velocity and volume – look for stable or rising trends to pinpoint ideal fishing times. Learn to interpret sudden spikes or drops, which can indicate potential challenges. Next, consult our weather reports to understand ambient conditions. Pairing the two, you can anticipate fish behavior, choose the right gear, and select the best fishing spots. Use these tools together for a holistic approach to your next fishing adventure.

In-Depth Weather

Directions To Location

Hatch Chart

Month Hatch Time of Day Recommended Fly Sizes Popular Fly Patterns
January Midges Afternoon 18-24 Zebra Midge
Winter Stoneflies Midday 16-18 Black Stonefly Nymph
February Midges Afternoon 18-24 Griffith's Gnat
Winter Stoneflies Midday 16-18 20 Incher Stone
March BWO Midday 18-20 Pheasant Tail Nymph
Midges Midday 18-24 Rusty Midge
April Caddis Afternoon 14-18 Elk Hair Caddis
BWO Midday 18-20 BWO Dun
May Caddis Afternoon 14-18 X-Caddis
BWO Midday 18-20 Blue Quill
June Golden Stoneflies Midday 8-10 Golden Stone Nymph
Caddis Afternoon 14-18 Delektable CDC Baby
July Terrestrials Afternoon 12-16 Chubby Chernobyl
Golden Stoneflies Midday 8-10 Pats Rubber Legs
August Terrestrials Afternoon 12-16 Parachute Hopper
Tricos Morning 20-24 Trico Spinner
September BWO Midday 18-20 RS2
Terrestrials Afternoon 12-16 Ant AC
October BLUE WINGED OLIVES (BWO) Midday 18-22 Blue Winged Olive
Midges Afternoon 24-26 Smoke Jumper
November Winter Stoneflies Midday 16-18 Black Stonefly Nymph
Midges Afternoon 24-26 Holy Grail Midge
December Midges Afternoon 24-26 Mercury Midge
Winter Stoneflies Midday 16-18 Pats Rubber Legs

While we strive to ensure the precision of our hatch charts, some reflect broader river region insights. Through ongoing partnerships with local guides and fly shops, we’re committed to refining our data. Should you notice any inconsistencies or have feedback, we welcome you to reach out. 

Best Fishing Spots

The North St. Vrain below Button Rock offers an abundance of excellent fly fishing spots cherished by angling enthusiasts. These spots provide diverse fishing conditions and are home to a range of fish species.

  • Below Button Rock Dam: This area overflows with Brown and Rainbow Trout and is friendly for beginners.
  • The Wild Basin Area: For a more adventurous angling experience, this spot provides beautiful mountainous surroundings and native Cutthroat Trout.
  • Narrows in the North St Vrain Canyon: As wild as it sounds, it’s rich with species such as Brown Trout and even Brook Trout.
  • Longmont Reservoir: Located just below Button Rock Dam, this area is perfect for float tube fishing, especially for Brown and Rainbow Trout.
  • Ralph Price Reservoir: This spot is less frequented and offers a serene fishing experience with varieties of Brown Trout and Cutthroats.

Remember to adhere to local fishing laws and practices ensuring sustainability for future generations.

Best Access Points

The North St. Vrain below Button Rock provides excellent fly fishing opportunities for enthusiasts. The best access points include:
  • Longmont Dam: This is a prime fishing spot before entering the private property. You can park near the dam and follow the trail down to the river.
  • Ralph Price Reservoir: This reservoir is above the Button Rock Dam and has ample parking and trail access.
  • Picnic area at the entrance to Button Rock Preserve: This allows for easy access to the river, providing excellent fly fishing for brown and rainbow trout.
  • North side of Button Rock Dam: Access the river from here for fishing near the spillway.
  • Sleepy Lion Trail: This trail winds around the reservoir providing several points of access to the river, most notably at Confluence Park.
Remember, follow all local regulations and respect private property rights when accessing these points.

Local Fish

  • Brown Trout: The Brown Trout is a common target for fly fishing in North St. Vrain due to its beautiful coloring and feisty nature.
  • Rainbow Trout: Another popular species for fly fishing, the Rainbow Trout is appreciated for its spectacular coloration, and vigorous fight when hooked.
  • Cutthroat Trout: These fish are natives to the region and are known for their distinctive red throat slash.
  • Brook Trout: Brook Trout are loved by flyfishers due to their beautiful color patterns and their willingness to take a dry fly throughout the season.
  • Golden Trout: This is a relatively rare species that provides a challenge for experienced fly fishers.
  • Greenback Cutthroat Trout: This trout is a native to Colorado and is sought after by many fly fishers.
  • Mountain Whitefish: These fish are well-adapted to the cold, clear waters of the North St. Vrain and provide a good challenge for fly fishers.
  • Pike: The powerful Pike is a thrilling target for any fly fisher willing to test their skills on this aggressive species.

About The River

Situated in the enchanting town of Lyons, Colorado, the North St. Vrain – Below Button Rock is an explorer’s delight. This vibrant creek not only offers fun-filled water sports activities, but also gives a glimpse into Colorado’s rich history. Its story dates back to multiple generations when our ancestors used the river as a significant water source. Isn’t that fascinating?
  • The creek was named after Ceran St. Vrain, a pioneer trader who played a crucial role in Colorado’s early development.
  • Its most exciting feature, the Button Rock Dam, was constructed in 1965. The dam transformed the landscape, making the creek ideal for adventurous activities like kayaking and fishing.
  • The scenic trail alongside the creek was once used by settlers and is now a favourite hiking route.
One visit to North St. Vrain – Below Button Rock and you’ll feel connected to Colorado’s past while savouring the soul-stirring beauty it has to offer.
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