south platte river top fly fishing spots
March 24th, 2025

South Platte River Premium Fly Fishing Report

📅 Week of March 19, 2025
🎣 Brought to you by Rise Beyond Fly Fishing

🔥 Stop guessing. Fish the right flies at the right time. Get premium reports + hatch-matching flies delivered monthly.


1

  • Flow Rate: 170 CFS (steady)
  • Water Temperature: 38° to 42°F
  • Water Clarity: Clear
  • Fish Behavior: Fish are transitioning from deep pools to riffles midday. Expect best activity 10 AM - 3 PM.
  • ⏳ Best Fishing Windows:
    • 8 AM - 11 AM: Slow start, deep nymphing is best. Fish are hugging the bottom.
    • 11 AM - 2 PM: Midges/BWOs hatch, emerger patterns key. Look for fish sipping in soft seams.
    • 2 PM - 5 PM: Dry-dropper setups in riffles & slow runs.

🎣 Best Approach:
Morning: Deep nymphing with size #22-24 Zebra Midges, RS2s in dark colors. Adjust depth frequently based on flow.
Midday: Switch to BWO emergers (#20-22)—light indicator rigs or dry-dropper setups work.​
Afternoon: Dry-dropper rigs with Griffith’s Gnat or Sparkle Dun (BWO, #18-22) for rising fish in shallow water.​

3
  • Flow Rate: 160 CFS (steady)​
  • Water Temperature: 38° to 42°F​
  • Water Clarity: Crystal Clear​
  • Fish Behavior: Heavily pressured fish—technical drifts required. Small midges and BWOs are dominant.​
  • ⏳ Best Fishing Windows:
    • 8 AM - 10 AM: Slow start, best with light nymphs. Use stealthy approaches.​
    • 10 AM - 1 PM: Midge & BWO emergers dominate. Fish are extremely selective.​
    • 1 PM - 4 PM: Best dry fly action in slow eddies and pockets.

🎣 Best Approach:
Morning: Tiny Midge Nymphs (#22-26 Black Beauties, Bling Midges) under a 1.5X indicator rig.
Midday: RS2s (#20-24), Jujubee Midges (#22-24) suspended in feeding lanes.
Afternoon: Dry fly Sparkle Dun (#18-22) or a CDC Comparadun (#20-22) to rising fish. Use 6X fluorocarbon.

2-1
  • Flow Rate: 76 CFS (dropping)
  • Water Temperature: Cold in the morning, mid-40s midday
  • Water Clarity: Clear
  • Fish Behavior: Rainbows are active, but avoid targeting spawning fish on redds.
  • ⏳ Best Fishing Windows:
    • 9 AM - 12 PM: Slow but steady nymph bite. Fish are hugging deeper pools.
    • 12 PM - 3 PM: Best dry fly action—look for BWOs.
    • 3 PM - 6 PM: Switch to small streamers for hungry post-spawn browns.

🎣 Best Approach:
Morning: Dead-drifted streamers (Mini Dungeon, Olive #8-10) or Midge/BWO nymphs (#20-24).
Midday: Best dry fly window—CDC BWO Comparadun (#20-22).
Afternoon: Small streamers fished slowly.

Deckers
  • Flow Rate: 85 CFS (steady)
  • Water Temperature: 36° to 40°F
  • Water Clarity: Clear
  • Fish Behavior: Fish are concentrated in deeper runs and pools; midges are the primary hatch.
⏳ Best Fishing Windows:
  • 9 AM - 11 AM: Slow nymphing; fish are deep.​
  • 11 AM - 2 PM: Midge hatches increase; opportunity for dry fly action.
  • 2 PM - 4 PM: Nymphing remains productive; fish may move into riffles.​

🎣 Best Approach:
Morning: Nymphing with Black Beauty (#22-24) and Mercury Midge (#20-22).
Midday: Griffith’s Gnat (#20-24) for surface feeders during midge hatches.
Afternoon: Continue nymphing with midge patterns; consider adding a small attractor nymph.

5
  • Flow Rate: 95 CFS (slightly below average)
  • Water Temperature: 40° - 44°F
  • Water Clarity: Slightly Stained (recent snowmelt causing some runoff)
  • Fish Behavior: Fish are holding deeper in the early morning but will push into shallow seams and edges as the day warms.

⏳ Best Fishing Windows:

  • 7 AM - 10 AM: Early deep nymphing with small midges.
  • 10 AM - 2 PM: Best feeding activity—look for sporadic BWOs.
  • 2 PM - 5 PM: Small streamers and attractor nymphs work well.

🎣 Best Approach:

Morning: Zebra Midges (#22-24, Black or Red) under a small indicator. Fish deep in slow-moving water.
Midday: BWO RS2 (#20-22, Gray or Olive) suspended 12-18 inches below a dry fly.
Afternoon: Slow strips with Thin Mint Woolly Bugger (#8-10) or try a Rainbow Warrior (#18) for opportunistic feeders.

4
  • Flow Rate: 85 CFS (low)
  • Water Temperature: 38°- 42°F
  • Water Clarity: Slightly stained
  • Fish Behavior: Fish are mostly holding deep due to colder water temperatures.

⏳ Best Fishing Windows:

  • 9 AM - 12 PM: Best chance for midges—focus on slow pools.
  • 12 PM - 3 PM: BWO hatches increase, fish start moving into feeding lanes.
  • 3 PM - 6 PM: Light streamer action in cutbanks and structure-heavy areas.

Midges

Best Between 12 - 3PM

Guide Rating (800 x 175 px) (2)
Fly Name Size Color Best Presentation
Zebra Midge #20-26 Black, Red, Olive Dead-drift under an indicator in deep runs
Top Secret Midge #22-26 Brown, Black Best for Cheesman—use 6X fluorocarbon
Griffith’s Gnat #20-24 Black, Grey Dry fly for slow eddies & mid-afternoon rises
Foam Wing Emerger #20-22 Gray, Olive Excellent BWO/midge crossover fly
Black Beauty #22-26 Black, Brown Good dropper fly behind a heavier lead nymph

Blue Wing Olives (BWO)

Best Between 12 - 3PM

rise beyond fly fihsing company in denver colorado a guide rating for a stream. Good is 5 trout. This rating is for 3 trout. So good or semi challenging fishing conditions.
Fly Name Size Color Best Presentation
Zebra Midge #20-26 Black, Red, Olive Dead-drift under an indicator in deep runs
Top Secret Midge #22-26 Brown, Black Best for Cheesman—use 6X fluorocarbon
Griffith’s Gnat #20-24 Black, Grey Dry fly for slow eddies & mid-afternoon rises
Foam Wing Emerger #20-22 Gray, Olive Excellent BWO/midge crossover fly
Black Beauty #22-26 Black, Brown Good dropper fly behind a heavier lead nymph

Caddis

Low activity, could increase in sunny afternoons

rise beyond fly fihsing company in denver colorado a guide rating for a stream. Good is 5 trout. This rating is for 2 trout. So challenging fishing conditions.

 

Fly Name Size Color Best Presentation
Beadhead Caddis Larva #14-18 Green, Olive Dead-drift near the bottom with a weighted nymph rig
Sparkle Pupa #16 Tan Swing or lift in slow runs before emergence
Caddis Emerger #16-18 Olive, Brown Fished below the surface film in riffles
Elk Hair Caddis #14-16 Tan, Olive Dry fly presentation near banks and slower seams
Soft Hackle Caddis #16 Brown, Olive Slow swing in riffles and tailouts
X-Caddis #14-16 Olive, Tan Excellent for early caddis hatch risers
Stimulator #12-16 Yellow, Tan Great attractor dry fly, works well as a hopper-dropper

Terrestrials

Not Active Yet

Guide Rating (800 x 175 px) (6)
Fly Name Size Color Best Presentation
Parachute Ant #18-22 Black, Cinnamon Dead drift along banks and slow-moving pools
Fat Albert #12-14 Tan, Black Hopper-dropper setup in slower water
Micro Chubby Chernobyl #14-16 Tan, Purple Skated or twitched near the surface
Foam Beetle #16-18 Black Drifted tight to undercut banks or overhanging vegetation
Flying Ant #18-22 Red, Brown Dry fly presentation in back eddies on warm afternoons
Dave’s Hopper #10-12 Yellow, Olive Twitch slightly near grassy banks, early season attractor

Attractor Nymphs & Streamers

For Afternoon Fishing

rise beyond fly fihsing company in denver colorado a guide rating for a stream. Good is 5 trout. This rating is for 3 trout. So good or semi challenging fishing conditions.
Fly Name Size Color Best Presentation
Beadhead Caddis Larva #14-18 Green, Olive Dead-drift near the bottom with a weighted nymph rig
Sparkle Pupa #16 Tan Swing or lift in slow runs before emergence
Caddis Emerger #16-18 Olive, Brown Fished below the surface film in riffles
Elk Hair Caddis #14-16 Tan, Olive Dry fly presentation near banks and slower seams
Soft Hackle Caddis #16 Brown, Olive Slow swing in riffles and tailouts
X-Caddis #14-16 Olive, Tan Excellent for early caddis hatch risers
Stimulator #12-16 Yellow, Tan Great attractor dry fly, works well as a hopper-dropper

Next Week’s Hatch Trends & Forecast

💡 What’s coming up next week? Here’s how to prepare:

🔥 Increasing BWO Activity

  • Expect BWOs to become the dominant hatch by mid-week.
  • Fish will start keying in on duns, making dry fly fishing more effective.

🏪Stock up on:

  • CDC Comparaduns (#18-22) for emerging fish.
  • Film Critic BWO (#20-22) for fish feeding just below the surface.

🐜 Spring Transition – Start Packing More Terrestrials

  • Warmer afternoons mean early terrestrials may show up.
  • Expect trout to respond to ants and small beetles in slower runs.

🛍️Good Flies to Add

  • Parachute Ant (#18-22, Black or Cinnamon)
  • Fat Albert (#12-14, Tan or Black) for hopper-dropper setups

🌨️Snowmelt Impact & Flow Predictions

  • If temperatures rise, expect flow increases from Cheesman Dam.
  • Deckers will see slight CFS bumps, which may push fish into deeper pools for the first half of the week.
  • Fishing tip: Increase nymph rig depth by 6-12 inches if flows exceed 200 CFS
FAQs

Frequently Asked Questions (FAQs) for the South Platte Premium Report

The best fishing occurs between 10 AM - 3 PM as water temperatures rise and insect activity increases. Early mornings require deep nymphing, while afternoons may bring some dry fly action.

For midges, use 6X or 7X fluorocarbon due to the small fly sizes.For BWOs, 5X or 6X fluorocarbon is ideal, depending on water clarity and fish selectivity.

Below 100 CFS: Fish hold in deeper pools and slow runs; stealth is key.100 - 200 CFS: Optimal flows—fish spread out into riffles, seams, and banks.200+ CFS: Higher flows push fish into slower water; use heavier nymph rigs.

Slow, deep presentations work best. Use small streamers (Mini Dungeon #6-8, Thin Mint Bugger #8-12) and retrieve them slowly with occasional twitches.

Most likely, drag is the issue. Ensure a dead drift with a reach cast or by mending your line.Switch fly size—often dropping down one size smaller will help

Weight matters—use a weighted Caddis Larva (#14-18) as the lead fly and a smaller dropper (e.g., RS2 or Zebra Midge).Drift them near the bottom with a slow, natural presentation.

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