Smiling guest holding a Bow River rainbow trout under a bluebird sky on a guided fly fishing trip with King Trout Outfitters near Calgary

Fishing Reportgood

Bow River Fishing Report

Week of September 3, 2026

By Dan King · Lead Guide, King Trout Outfitters

Bow River fly fishing conditions in downtown Calgary on September 3, 2026 — low, clear late-summer water below the skyline and Centre Street Bridge, where King Trout Outfitters runs guided Bow River trips. — The Bow running low and clear through downtown Calgary on the evening of Thursday, September 3, 2026, looking across to the skyline and the Centre Street Bridge under scattered cloud. Point-in-time snapshot from the DELTATECH Calgary live river camera. Source: DELTATECH Calgary Live Camera →

Bow River fishing conditions for the week of September 3, 2026 are good. Flow is 80 cubic meters per second and stable. Water temperature is 14°C. No angling restrictions are in effect. Active hatches include Blue-Winged Olive (BWO), Trico, Terrestrials (Hoppers/Ants/Beetles), October Caddis.

Flow (m³/s) →

14°C

Water Temp ↓

good

Overall Conditions

None

Restrictions

iFlow context: The Bow read 80 cms late this afternoon and it's barely moved all week. It dipped into the high 70s Monday and Tuesday, ticked back to 81 today, and that's the entire story. Still sitting just under that 90 cms late-summer baseline it's held for well over a month now, low and clear and completely predictable. No rain, no runoff, nothing on the horizon to move it. This is still the best wading of the year. A few of the shallower floating lines run skinny at this level, so pick your water, and at this clarity the fish get a long look at everything, so fish light and fine. September's here now: the nights are cold, the light's going flat earlier, and you can feel the whole river tipping into fall. Source: Environment Canada

A red FLYPOD drift boat with two anglers on the Bow River near Calgary, ready to launch for a guided fly fishing trip

On the Water

Do You Need a Boat to Fish the Bow River?

You can wade the Bow in spots, but most of the best water sits along banks and seams you can only reach by drift boat. That is why guided trips here run from a boat. It covers miles of productive water in a day and keeps you safer when flows are up, like the 80 cms running this week.

What Are Conditions Like on the Bow River This Week?

“

Dan King

Lead guide at King Trout Outfitters · 15+ years on the Bow River

Dan here, and September is finally on the water. Flow's at 80 cms, same low clear river we've been riding for over a month, and honestly nothing's changed there but the calendar, and that's the good news. The nights have turned cold, the water's dropped to about 14 and falling, and the whole thing is tipping into fall right on schedule. Here's what that means. The Blue-Winged Olive is the fly of the moment now, thick on any grey afternoon up above Bearspaw and through town both. The Tricos are basically finished. And down low the fall streamer game is switching on, big Woolly Buggers and Sculpins swung for the staging browns, which are the biggest fish in the river. No official closure as I write this, but check My Wild Alberta before you head out. And I'll be straight with you: cool water and staging fall browns is the best fishing of the entire year on the Bow, and September and October book up fast. My calendar's already going. If you want a fall float, lock a date now.

Close-up of a wild brown trout held gently in hand showing distinctive spotted markings

What They're Eating

When Is Hopper Season on the Bow River?

Hopper season on the Bow runs from about mid-July into late September, and early fall is prime. On warm, breezy days the big browns push to the banks to eat grasshoppers off the surface, and it is some of the most exciting dry fly fishing of the year. Fish a foam hopper tight to grassy banks, often with a nymph dropped a couple feet underneath. This week's producing patterns are in the chart below.

What Hatches Are Active on the Bow River?

Insect	Hook Size	Activity
Blue-Winged Olive (BWO)	#18-22	heavy
Trico	#20-24	light
Terrestrials (Hoppers/Ants/Beetles)	#8-16	light
October Caddis	#8-10	light

See the full month-by-month Bow River Hatch Chart →

What Flies Are Working This Week?

Close-up of a hand selecting a fly from a well-stocked fly box

BWO Parachute

#18-20dry

Pheasant Tail

#16-18nymph

Foam Hopper

#8-12dry

Olive Woolly Bugger

#4-6streamer

Sculpin / Sparkle Minnow

#4-6streamer

Trico Spinner

#20-22dry

Pro Tip

No restrictions this week. Fish from dawn to dusk. The best window is mid-morning through late afternoon when the hatches are active and the water has warmed a few degrees.

Where Should You Fish the Bow River This Week?

Upper Bow

Above Bearspaw Dam

Above Bearspaw is a strong call this week. The Ghost feeds cold water in at the top, so this reach cools first and it's where the fall bugs show earliest. The Tricos are pretty much done now, thin and tiny, a calm-morning bonus at best on a #24 spinner. The real show up here is the Blue-Winged Olive. On a grey afternoon they come off the riffles thick, and a #18 parachute drifted into the soft seam behind a boulder is the first fly I'm tying on. When nothing's up top, run a Pheasant Tail deep through the same water and stay tight. Wade slow and low, because at 80 cms and this clarity a fish holding in a foot of water sees a heavy cast coming from way off.

City Section

Bearspaw to Carseland

The town water fishes right through the day again now that the nights have cooled it off. The midday shutdown from early August is long gone. Watch for a real BWO hatch off the flats whenever the cloud rolls in, and hunt noses in the slow water along Carburn and through the Prince's Island back channels with a #18 to #20 olive parachute. The hoppers are on their last legs but a browns will still eat one tight to the grass on the brighter breaks, so keep a foam bug in the rotation with an ant or a Pheasant Tail dropped off the bend. This is about as good as the city reach gets, and it's holding up all afternoon instead of quitting at noon.

Lower Bow

South of Calgary

Down through McKinnon Flats and on to Carseland is where the fall streamer game is waking up. The lower-river browns are the biggest, strongest fish in the system and they're starting to stage and get aggressive as the water cools. Swing a big Olive Woolly Bugger or a Sculpin through the deep buckets and along the cutbanks and hang on. A hopper-dropper still turns steady numbers between the streamer eats, and the BWO comes off down here too on the grey afternoons. The water's a touch warmer this far down but it's shedding heat fast now, so it fishes all day. Land these big browns quick, keep them wet, and turn them loose with plenty left in the tank.