Grand River
Cambridge to Paris · Caledonia
Ontario, Canada
Open live forecast →Target species: Brown, Rainbow, and Steelhead.
Stream gauge: 02GA003. Flow and water temperature update on every refresh.
Weekly AI Outlook as of 06/05/26
Grand River is running 629 cfs with prime June hatching already underway. No recent shop intel — outlook based on current conditions. Water temps in the mid-50s have triggered Caddis and March Browns, while the legendary Hex emergence should start any evening now. Target the twilight window downstream from Fergus where the biggest wild browns hunt the surface. Days are cooling from 83°F to 73°F through the weekend — perfect for extended midday dry fly action without heat stress.
- Flow: 629 cfs — excellent level for wading and sight fishing. River structure well-defined with good pocket water and runs holding fish.
- Hatches: March Browns and Caddis active. Hex emergence imminent — watch for the first #6-8 duns at dusk downstream from Fergus.
- Water Temp: Mid-50s — crossed the Caddis threshold with March Brown peak underway. Hexagenia trigger zone approaching fast.
- Best Window: All-day fishing through weekend, but prime time is 7-9pm for emerging Hex. Biggest wild browns feed in failing light.
Generated weekly from live USGS gauge readings, weather forecasts, and recent fly shop reports. Updates Friday mornings.
About this Water
- Tailwater
- Best months: Apr–Oct, peak May–June (trout); July–Sept (smallmouth)
The Grand River in southern Ontario is a productive trout and smallmouth bass river running through farmland and small towns west of Toronto. The Grand River Conservation Authority manages cold-water releases through the Belwood and Conestogo Lakes, creating tailwater conditions that support brown trout in the upper reaches. Smallmouth bass dominate the warmer middle and lower reaches. The fishery has been impacted by sustained restoration work over decades.
The Grand River is Canada's only Heritage River that supports a major trout fishery — federal Heritage River designation protects the watershed while the cold-water releases sustain a brown trout fishery uncommon in southern Ontario.
Recommended Flies — Steelhead (Oncorhynchus mykiss)
- Sep
- Oct
- Nov
- Mar
- Apr
- May
The Grand River in southern Ontario is a world-class rainbow trout and steelhead fishery. Lake Erie steelhead run the Grand from October through May. The accessible reaches below Belwood Lake Dam near Fergus and the lower river near Brantford support impressive runs of hatchery and wild fish.
Productive Patterns
- Egg Pattern #4–8
- Bead Nymph #4–8
- Spey Fly #4–8
- Wooly Bugger #4–8
- Sucker Spawn #4–8
Technique
The Grand's steelhead are accessible from downtown Fergus and Elora. Indicator fishing with egg patterns is the most productive approach. The Elora Gorge section is dramatic and challenging. Weekend crowds can be significant during peak runs.
Seasonal Notes
Lake Erie steelhead enter with fall rains in October. Spring run peaks in April. Resident brown trout offer year-round fishing. Egg patterns and beadhead stoneflies dead-drifted through the runs and slots.
January Outlook
January on the Grand River tailwater below Shand Dam — Ontario's finest trout stream is producing year-round thanks to the dam-regulated tailwater. The January fishery is limited to nymphing in the core tailwater section near Fergus. Mysis shrimp and small nymph patterns in the cold, clear flows.
Productive Patterns
- Mysis Shrimp (dam outflow)
- Zebra Midge #20-22
- BH Pheasant Tail
- Egg Pattern (residual winter steelhead)
Tips
The Grand River tailwater below Shand Dam maintains fishable temperatures in January — typically 38-44°F. Ontario fishing license required. Fish the section from the dam to downtown Fergus for the most reliable January conditions. Dress warmly — Ontario January is cold.
Water Notes
100–600 cfs regulated. Water 38–44°F from Shand Dam. The tailwater keeps the fishery open year-round. January fishing is nymphing-focused in the dam tailwater.
February Outlook
February on the Grand River tailwater. The Shand Dam releases continue to keep the tailwater section near Fergus fishable in cold Ontario winter. Nymphing with midges and mysis shrimp patterns. The steelhead run is 4-6 weeks away — anticipation builds.
Productive Patterns
- Mysis Shrimp
- Zebra Midge
- BH Pheasant Tail (size 16-18)
- Mercury Blood Midge
Tips
February fishing on the Grand is quiet but productive for those who pursue the tailwater nymphing. The section between Shand Dam and Fergus is the most reliable. Watch for early steelhead in the last days of February in mild years. Use an indicator rig with light weight.
Water Notes
100–500 cfs. Water 38–45°F. Tailwater conditions. Stable year-round Grand River flows. Steelhead 4-6 weeks away.
March Outlook
The Grand River below Shand Dam near Fergus is Ontario's finest wild trout stream. March brings the first steelhead from Lake Erie up into the warm tailwater — the most significant early-season event on the Grand. Brown trout nymphing is productive year-round.
Productive Patterns
- Sucker Spawn (yarn fly)
- Mysis Shrimp
- BH Pheasant Tail
- Egg Pattern (steelhead)
Tips
Ontario fishing license required. The Grand has catch-and-release sections for brown trout. The steelhead run begins in late March. The tailwater between Shand Dam and Fergus is the most reliable section year-round.
Water Notes
100–800 cfs regulated. Water 42–50°F from dam. The tailwater effect creates exceptional year-round conditions.
April Outlook
Peak steelhead season on the Grand River. Chrome lake-run steelhead from Lake Erie fill the river from Brantford to Fergus. Simultaneously, excellent brown trout dry fly fishing with Hendrickson and early Caddis hatches.
Productive Patterns
- Hendrickson #12-14
- Intruder (small, steelhead)
- Egg Pattern
- Elk Hair Caddis #16
Tips
The Grand River steelhead are Lake Erie fish — large, powerful, and often over 10 lbs. Nymphing with indicator below Shand Dam is most productive for steelhead. Switch to dry flies when Hendrickson hatches start at 1pm. Two completely different fisheries in one day.
Water Notes
200–1,500 cfs. Water 42–52°F in the tailwater, colder upstream. Steelhead staging from Lake Erie.
May Outlook
Sulphur, Caddis, and Brown Drake hatches on the Grand. The steelhead run is winding down but the resident brown trout fishing is outstanding. Ontario's most important trout river fully productive.
Productive Patterns
- Sulphur Sparkle Dun #16
- Elk Hair Caddis
- Brown Drake #10
- March Brown
Tips
The Brown Drake hatch on the Grand is one of the most significant in Ontario — large mayflies that produce spectacular evening rise fishing. Book accommodations in Fergus for the Drake hatch in late May.
Water Notes
200–1,000 cfs. Water 48–56°F. Prime spring conditions throughout.
June Outlook
Excellent Brown Drake, Hex, and Caddis hatches. The Grand River fishes all day in June with multiple hatch windows. One of eastern Canada's finest June trout rivers.
Productive Patterns
- Brown Drake #10-12
- Hexagenia #6-8
- Elk Hair Caddis
- Comparadun
Tips
The Hexagenia hatch on the Grand is a summer event — the massive mayflies produce the largest fish of the year. Fish the evening hatch from Fergus downstream. The biggest wild brown trout come up at dark during the Hex hatch.
Water Notes
150–600 cfs. Water 52–60°F. The tailwater keeps the river in prime condition through June.
July Outlook
Summer terrestrial season on the Grand. Ants, beetles, and Trico spinner falls. The tailwater section near Fergus maintains cool temperatures when other Ontario streams are stressed.
Productive Patterns
- Flying Ant #18
- Beetle #16
- Trico Spinner #20-22
- Elk Hair Caddis
Tips
The Grand's limestone character and tailwater influence maintain summer water quality better than most Ontario streams. Focus morning Trico falls in the flat sections. Terrestrials through midday.
Water Notes
100–400 cfs. Water 56–64°F in tailwater. Limestone Grand maintains cooler temps than freestone streams.
August Outlook
Continued terrestrial fishing with Trico mornings. The Grand's large brown trout feed selectively in the clear summer water. The Elora Gorge section provides unique gorge fishing.
Productive Patterns
- Trico Spinner
- Flying Ant
- Beetle
- Hopper (larger sections)
Tips
The Elora Gorge section is distinctive — sheer limestone walls with large wild brown trout in a dramatic canyon setting. The gorge water stays cold and shaded in August. A unique Ontario fishing experience.
Water Notes
80–300 cfs. Water 58–65°F. Limestone tailwater advantage in August heat.
September Outlook
The Grand River's finest fall month. BWO hatches return, steelhead begin entering from Lake Erie, and wild brown trout are in peak pre-spawn condition.
Productive Patterns
- Blue Winged Olive #18-20
- Elk Hair Caddis
- Streamer
- Sucker Spawn (early steelhead)
Tips
September on the Grand is outstanding — BWO hatches on overcast afternoons produce exceptional dry fly fishing. The first fall steelhead begin entering by late September. Two quality fisheries overlapping.
Water Notes
100–500 cfs. Water 52–60°F. Excellent fall conditions building.
October Outlook
Fall steelhead run peaks and brown trout spawning begins. The Grand River in October is a major event for Ontario anglers. Steelhead to 15+ lbs in accessible water.
Productive Patterns
- Egg Pattern
- Steelhead Sucker Spawn
- Intruder (small)
- BWO Parachute
Tips
October steelhead on the Grand are trophy fish from Lake Erie. Nymph below Shand Dam for best results. The brown trout spawn brings spawning activity to visible redds — observe only, don't target spawning fish.
Water Notes
150–800 cfs. Water 46–54°F. Peak fall steelhead run. One of Ontario's most significant fall fisheries.
November Outlook
Late fall steelhead still available. The tailwater section provides consistent fishing long after other Ontario rivers have shut down. Cold but productive.
Productive Patterns
- Egg Pattern
- Steelhead Nymph
- BH Pheasant Tail
- Mysis Shrimp
Tips
The Shand Dam tailwater maintains fishable temperatures through November. Late steelhead are the primary quarry. The section from the dam to Fergus stays open and productive into December in mild years.
Water Notes
100–600 cfs. Water 42–50°F from the tailwater. Cold but fishable. One of Ontario's last trout rivers to fish in late fall.
December Outlook
December on the Grand River tailwater — the Shand Dam continues releasing regulated water and the tailwater section near Fergus is fishable even in December. Late steelhead in mild years. Nymphing with mysis shrimp and egg patterns. One of Ontario's most unique winter fisheries.
Productive Patterns
- Mysis Shrimp
- Egg Pattern (late steelhead)
- Zebra Midge
- BH Pheasant Tail
Tips
The Grand River tailwater is one of Ontario's true year-round fisheries. December temperatures in the tailwater section stay above 38°F even when surrounding freestone streams are frozen. Steelhead can linger into December in mild years. Dress appropriately for Ontario December fishing.
Water Notes
100–600 cfs. Water 38–44°F in tailwater. The dam effect keeps this section open year-round. One of very few Ontario rivers fishable in December.
Hatch Calendar
| Insect | Peak | Active | Size | Productive Patterns |
|---|---|---|---|---|
| Hendrickson Ephemerella subvaria |
May | Apr, May, Jun | #12–14 |
|
| Blue Winged Olive Baetis spp. |
Apr, May, Sep, Oct | Apr, May, Aug, Sep, Oct | #18–22 |
|
| March Brown Maccaffertium vicarium |
May, Jun | May, Jun | #10–12 |
|
| Cahill Stenacron interpunctatum |
Jun | May, Jun, Jul | #12–14 |
|
| Sulphur Ephemerella dorothea / E. invaria |
Jun | May, Jun, Jul | #14–18 |
|
| Caddis Hydropsyche / Brachycentrus spp. |
Jun, Jul | May, Jun, Jul, Aug, Sep | #14–18 |
|
| Trico Tricorythodes spp. |
Aug | Jul, Aug, Sep | #22–24 |
|
Access & Approach
Fergus and Elora, ON are the main bases. Public access at Grand River Conservation Authority sites. Ontario fishing license required.
Nearby Fly Shops
- Grand River Troutfitters
Regulations & License
Fishing in Ontario requires a current license. Always verify season dates, bag limits, and any special-regulation waters before you fish.
Ontario fishing regulations & license →
About Current
Grand River conditions on Current combine real-time flow data (USGS, WSC, CDEC, CEHQ), weather, tide predictions, hatch probabilities calibrated to this specific water, and recent fly shop reports from the area.
Grand River is one of 245 hand-curated waters in Current. The app and web forecast also generate AI outlooks for any unlisted river, lake, or saltwater flat anywhere in the world — drop a pin or paste a name and Current produces a fresh seasonal outlook with weather, flow context, and recommended techniques.
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