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Waterton Canyon on the South Platte River isn’t just another spot on the map—it’s a rite of passage for fly fishing enthusiasts. If you’re looking to sharpen your skills, this is the place. The canyon’s reputation as one of the most technical fisheries around isn’t just for show; it’s earned.
South Platte River Fishing Report | Waterton Canyon | April 2025
Listen to the Podcast!
April in Waterton Canyon is when things start to quietly heat up. The canyon walls are still lined with frost most mornings, and the bighorn sheep are more active than the anglers. But the trout? They’re waking up, too. With longer days and the occasional afternoon warmth, midges and blue-winged olives are starting to trigger feeding behavior in slower pockets and tailouts.
Flows are still low and crystal clear, so stealth and small bugs are key. You’ll find the best activity late morning into early afternoon, especially on those glorious overcast days when a BWO hatch might surprise you. This stretch is still technical, but for the patient angler who can throw a clean drift, the rewards are there—just don’t expect an easy win.
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Conditions Summary
Flow Rate: 45-60 CFS (Low and spooky)
Water Temperature: 38-42°F
Clarity: Gin clear
Best Times: Late morning to mid-afternoon
Star Rating: ⭐⭐⭐ (3/5 – Clear water, tricky trout, but potential is there)
River Flow Chart
Source: Colorado DWR River Station Reports
Waterton Canyon Hatch Chart
| Month | Primary Hatches | Effective Patterns |
|---|---|---|
| Feb | Midges, Winter Stones | Zebra Midge (#20-24), Black Beauty (#20-22), WD-40 (#20-24) |
| Mar | Midges, BWOs | RS2 (#20-22), Blue Wing Olive (#18-22), Pheasant Tail (#18-20) |
| Apr | Baetis, Caddis | Elk Hair Caddis (#16-18), Juju Baetis (#18-20), RS2 (#20-22) |
Top Flies for the Week
- Dry Fly: Blue Wing Olive (#18-22) – Use during overcast days in the afternoon when trout are looking up.
- Nymph: RS2 (#20-22) – Great trailing pattern behind a slightly larger attractor like a Pheasant Tail.
- Streamer: Mini Leech (#10-12) – Dead-drift in deep slow pools—don't strip too fast.
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South Platte River | Where to Fish Today
Tips for Fly Fishing Waterton Canyon in March
Seasonal Tip
Low flows mean you’ll need to sneak up on every pool. Wear dull colors and stay off the banks when possible.
Dry Fly
Only worth trying on overcast afternoons when Baetis are popping. Look for sippers in slow tailouts.
Nymphing
This is your go-to method—pair a small midge or BWO imitation behind a tungsten beadhead.
Streamer Fishing
Possible but limited—try dead-drifting small leeches or buggers near undercut banks.
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Access Points
Main Trailhead (Waterton Canyon Parking Area)
- Description: Flat, easy walk up a wide canyon trail following the river.
- Why Fish Here: Simple access to miles of water—great for a full-day adventure.
- Locals’ Rating: ⭐⭐⭐⭐
Mile Marker 1-3 (Deep Pools & Pocket Water)
- Description: Some of the deepest holding water in the canyon.
- Why Fish Here: Good spot for nymphing and spotting larger fish.
- Locals’ Rating: ⭐⭐⭐
Far Upper Canyon (5+ Miles In)
- Description: Less pressured water, long walk or bike ride in.
- Why Fish Here: Escape the crowds—can be worth the trek in spring.
- Locals’ Rating: ⭐⭐⭐⭐
Local Regulations and Notes on Landowner Rights
- Catch and release encouraged
- Artificial flies and lures only
- Be mindful of Denver Water operations—they occasionally restrict access past the dam
- Watch for wildlife closures or reroutes—bighorn sheep rule this canyon
Waterton in April isn’t about quantity—it’s about precision. Slow down, size down, and you just might tangle with a surprisingly healthy rainbow in this front-range gem.
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