Waterton Canyon
Rob Herrmann Photography

South Platte: Waterton Canyon (Lite Report)

Difficulty Beginner/Intermediate
Ideal Days To Fish NA

Weekly Report

Report DateMarch 28, 2022

Note: This report is a part of the FlyCast Lite reporting program and is updated seasonally or in the event of substantial changes that alter fly fishing tactics. FlyCast Lite reports are intended to give anglers a high level overview on seasonal conditions and general fishing tactics.

South Platte flows at Waterton Canyon currently sit well below the historical average of 100 cfs. Trout are consolidated in pronounced sections of the river and skittish due to low flows and high water clarity. On the bright side, Strontia Springs Reservoir is at 90% capacity, so it’s only a matter of time before flows increase. Until that happens, double nymph rigs will get the job done in deep pools/runs. If trout move into shallower water on an overcast day, a hopper dropper is a stealthy alternative to a nymph rig. As we move further into spring, flows will rise and bug activity will increase. Midges are the dominant hatch at the moment, but we’re starting to see BWO numbers increase by the day. Griffiths Gnat’s, Cluster Midges, Parachute Adams and Parachute BWOs in size #18-20 are our go-to patterns for these hatches. Towards the end of April/early May, caddis will break onto the scene and add more items to the menu. Active BWO and caddis hatches will have trout looking up at the surface to feed, so be prepared to fish dry flies. When trout aren’t rising, a combination of searcher/attractor patterns and midge/baetis emergers usually do the trick. Pat’s Rubber Legs, Copper Johns, Guide’s Choice Hare’s Ears, Pheasant Tails, Rainbow Warriors, Frenchies and Red Tag Jigs are solid lead patterns. For your trailer, you can’t go wrong with Zebra Midges, Black Beauties, Mercury Midges, Blue Poison Tungs, RS2s, Barr’s Emergers and Foam Back Emergers.

Recommended Flies

River Flow

Flow Region

Detailed River Info


The Waterton Canyon stretch of the South Platte is a fun and convenient option for anglers living in the Denver Metro Area. The South Platte River merges with the North Fork of the South Platte above Strontia Springs Reservoir. Below Strontia Springs Reservoir is the Waterton Canyon stretch of the South Platte. This section of river flows 6.5 miles northeast from the reservoir through Waterton Canyon before spilling into Chatfield Reservoir. Waterton Canyon is unique in that it’s only accessible by foot or bike. As a result, Waterton Canyon receives far less angling pressure than the other sections of the South Platte, but it does experience heavy hiking and biking traffic, so keep that in mind while casting. Waterton Canyon is technically fishable year around but due to high canyon walls, the banks and shaded sections tend to freeze during the winter. Anglers will find a healthy population of rainbow and brown trout in the 6 – 12 inch range. With that said, don’t be surprised if you come across a large brown or rainbow that has migrated from Chatfield Reservoir.


Waterton Canyon is a fantastic stretch for anglers of all skill levels. The lower part of the canyon contains slow runs and deeper pools that are ideal for new anglers working on their presentation skills. Higher in the canyon, you’ll find faster pocket water that will test the skills of more experienced anglers. With the exception of a few deep pools and runs, the river is relatively shallow, making a dry dropper setup our preferred strategy most of the year. Fishing a dry dropper will attract trout feeding on the surface and those feeding sub-surface on nymphs. Hopper and caddis patterns are productive dry fly options for a dry dropper setup. Waterton Canyon experiences a number of hatches throughout the year (midge, baetis, caddis and stonefly) so don’t be surprised if you see trout aggressively feeding on the surface during a hatch. Unless you’re matching the hatch and casting to rising trout, fly selection isn’t overly complicated in this river. Standard searcher patterns (Pheasant Tails, Guide’s Choice Hare’s Ears, Copper Johns, Prince Nymphs etc.), San Juan Worms and midge patterns are consistent year around. During the warm months, caddis, stonefly and baetis patterns are highly productive.

River Access

With a primary parking lot and one trail into the canyon, access to Waterton Canyon is straightforward. From the parking lot, anglers can either walk or bike up the canyon on a 6.5-mile-long, dirt road (cars are prohibited). If you have the ability, we highly recommend biking as it will allow you to cover more ground. If biking isn’t an option, don’t worry, there is plenty of good water in the bottom half of the canyon. Keep in mind, dogs aren’t allowed in the canyon, so you’ll need to leave your furry fishing buddy at home.