Alberta

Sheep River

Alberta·Bow Valley and Calgary·50.63° N, 114.53° W

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Solunar · next 7 days

About Sheep River

The Sheep is the Highwood's smaller neighbour to the north, and it splits into two fisheries the same way. Up top it is a clear Kananaskis freestone that runs past Bluerock, over Sheep River Falls and through the canyons of Sheep River Provincial Park, with Highway 546 close above it. Westslope cutthroat, bull trout and rainbows live here, along with cutbows, and the water is small enough to fish with one dry fly and a short walk between pools. Below the park it leaves the mountains, crosses ranch country into Diamond Valley (the old towns of Turner Valley and Black Diamond), and runs on through Okotoks to the Highwood. The lower river is wider and warmer, with rainbows, mountain whitefish and some brown trout. The river is open June 16 to October 31, bait is banned, and no trout of any kind may be kept anywhere on it.

Read the Black Diamond gauge, which sits at the Highway 22 bridge and shows what the park water is doing upstream. Runoff usually holds the river high and brown from mid-May through June. As it drops toward about 8 m³/s (280 cfs) in July it clears, and that is when the season really starts: stoneflies and caddis first, then mayflies, and hoppers along the grassy banks from August on. The best weeks are often late July to mid-September, at about 2 to 6 m³/s (70 to 210 cfs), when you can cross most tailouts in the park. Above about 15 m³/s (530 cfs) the river is high and off-colour, and a big rain in the foothills can push it back there for a few days. In a hot, dry August the lower river runs low and warm, so fish the park water early in the day. September and October bring olives, cooler water and fewer anglers, and the few brown trout on the lower river come to streamers.

Know three things before you go. The river is closed all year from the bridge at Indian Oils day use down to Gorge Creek, through the Sheep River Wildlife Sanctuary, so fish above Indian Oils or below Gorge Creek. You need a Kananaskis Conservation Pass to park inside the park. Below the park the banks are mostly private ranch land, so reach the water at bridges and road allowances and stay below the high-water mark, or ask the landowner. And when the Bow runs warm and low, Alberta can close every ES1 stream from 2 pm to midnight, the Sheep included, so check the advisories before a July or August trip.

Species

Rainbow Trout
Common · Jul-Oct · 10-16", some larger on the lower river
Found from the park water down to the Highwood. Most of the fish on the lower river are rainbows. Catch and release only.
Westslope Cutthroat Trout
Present (upper river) · Jul-Sep · 8-14"
Native, and listed as Threatened. Look for them in the park water above Indian Oils and in the cold tributaries. Many fish in the river carry rainbow genes. Catch and release only, and keep them in the water.
Cutbow Trout
Present · Jul-Sep · 10-16"
Rainbow and cutthroat hybrids turn up with both parents. They count as trout, so they go back.
Bull Trout
Present (protected) · Release only · 16-26"
Native and listed as Threatened. Found in both the park water and the lower river, and more often seen in late summer and fall. Zero harvest in Alberta. Release them quickly and keep them in the water.
Mountain Whitefish
Common (lower river) · Jul-Oct · 10-16"
Native. Most common below Gorge Creek, where you may keep 5 over 30 cm. They take small nymphs in the deeper runs.
Brown Trout
Uncommon (lower river) · Sep-Oct · 12-20"
Introduced. A few live in the lower river and in the park, and they come to streamers in fall. Catch and release only.

Species	Abundance	Best Season	Size
Rainbow Trout	Common	Jul-Oct	10-16", some larger on the lower river
Westslope Cutthroat Trout	Present (upper river)	Jul-Sep	8-14"
Cutbow Trout	Present	Jul-Sep	10-16"
Bull Trout	Present (protected)	Release only	16-26"
Mountain Whitefish	Common (lower river)	Jul-Oct	10-16"
Brown Trout	Uncommon (lower river)	Sep-Oct	12-20"

Sections

5 reaches

Black Diamond to the Highwood (Okotoks)

WadeBull Trout · Brown Trout · Rainbow Trout · Whitefish

The lower river, from Black Diamond past the Threepoint Creek confluence and through Okotoks to the Highwood. It is the biggest water on the Sheep, with gravel runs, cut banks and willow edges, and it runs low and warm in a dry August. Rainbow trout and mountain whitefish are the main fish, with brown trout in the deeper runs and the odd bull trout. Town paths in Diamond Valley and Okotoks reach the river, and the Okotoks gauge reads this reach. Most other banks are private land.

Best for: Evening caddis and nymphs for rainbow trout and whitefish in July, and streamers for brown trout in October.

Sandy McNabb to Black Diamond

WadeBull Trout · Brown Trout · Rainbow Trout · Whitefish

The river leaves the park and winds through ranch country past Turner Valley to the Highway 22 bridge at Black Diamond, where the gauge sits. Access is the hard part: much of the bank is private land, so start at a bridge or road allowance and stay below the high-water mark, or ask the landowner. The water warms as it goes. Rainbow trout and mountain whitefish are the main catch, with a few brown trout and bull trout.

Best for: Quieter water for rainbow trout and whitefish, for anglers who sort out access first.

Gorge Creek to Sandy McNabb

WadeCutbow · Bull Trout · Rainbow Trout · Whitefish

The lower park water, from the Gorge Creek confluence below the closed sanctuary down past Dyson and Coal creeks to Sandy McNabb, at the east edge of Sheep River Provincial Park. The valley opens up, and the river runs through longer riffles and corner pools within sight of Highway 546. Rainbow trout and cutbows carry the catch, with mountain whitefish in the runs and bull trout in the deeper water. Sandy McNabb campground and the day-use areas along the highway make it easy to reach.

Best for: Easy-access riffles and runs for rainbow trout, with a hopper in August and a streamer for a bull trout in fall.

Junction Creek to Indian Oils

WadeCutthroat · Cutbow · Bull Trout · Rainbow Trout

The roadside park water from Junction Creek past the Bluerock campground and the Highway 546 bridge, over Sheep River Falls, down to the bridge at Indian Oils day use. It is a mix of canyon pools, pocket water and short runs, with Highway 546 close above it. Westslope cutthroat trout, cutbows and rainbow trout take dries, and bull trout hold under the falls and in the deep slots. Stop at the Indian Oils bridge: the river below it is closed all year.

Best for: Short walks to canyon pools for cutthroat and rainbow trout, on dries and small nymphs from mid-July into October.

Sheep River Trail (above Junction Creek)

WadeCutthroat · Bull Trout

The headwater reach above the end of Highway 546, reached on foot or by bike along the Sheep River Trail from the Junction Creek area. The river is small and clear, with plunge pools and pocket water below Bluerock Mountain. This is the best chance on the river at westslope cutthroat trout, with bull trout in the deeper holes.

Best for: A day hike for westslope cutthroat trout on small dry flies in late July and August.

At a glance

Ideal wading flow: 1.7–7.9 m³/s
Blow-out: >15 m³/s
Ideal water temp: 10–16°C

Best seasons

Read at the Black Diamond gauge, at the Highway 22 bridge. It sits below the park and the foothill tributaries, so the park water upstream carries a little less than it shows. The season opens June 16, usually still in runoff, with the river often above about 15 m³/s (530 cfs) and brown. It clears as it falls under about 8 m³/s (280 cfs), usually in July. About 2 to 6 m³/s (70 to 210 cfs) is the late July to September sweet spot, clear and easy to wade. Under about 1.7 m³/s (60 cfs) in a dry fall the trout get spooky, so go small and stay low. The Okotoks gauge reads the lower river after Threepoint Creek joins. Trout feed best at about 10 to 16 °C (50 to 61 °F). Neither gauge reports water temperature, so carry a thermometer and stop above 20 °C (68 °F).

Regulations

The Sheep is in Alberta's ES1 watershed unit and has three rules by reach. Above the bridge at Indian Oils day use it is open June 16 to October 31 with a bait ban and no trout kept. From that bridge down to Gorge Creek it is closed all year. From Gorge Creek down to the Highwood it is open June 16 to October 31 with a bait ban, no trout kept, and 5 mountain whitefish over 30 cm.

Headwaters down to the bridge at Indian Oils day use, with tributaries: open June 16 to October 31, bait ban, trout limit 0.
Bridge at Indian Oils day use down to Gorge Creek, with tributaries except Gorge Creek: closed all year.
Mainstem and tributaries from Gorge Creek down to the Highwood River, except Threepoint Creek: open June 16 to October 31, bait ban, mountain whitefish 5 over 30 cm, trout limit 0.
Gorge Creek, with its tributaries: open June 16 to October 31, bait ban, trout limit 0.
Bull trout limit 0 everywhere in Alberta.
When the Bow runs warm and low, the province can close ES1 flowing waters from 2 pm to midnight. Check mywildalberta.ca before a summer trip.
You need a WiN number and an Alberta sportfishing licence, sold through AlbertaRELM.

Any period not listed is closed, so the river is closed November 1 to June 15. Bait ban means unscented lures and flies only. Threepoint Creek has its own listing in the ES1 table, so check it before you fish it. Bull trout and westslope cutthroat are both listed as Threatened, so keep them in the water. You need the landowner's permission to cross private land below the park.

Source: 2026 Alberta Guide to Sportfishing Regulations (ES1). Regulations change annually. Verify before fishing.

Getting there

Diamond Valley (Black Diamond), AB

About 1 hr from Calgary to Black Diamond by Highway 22, and about 1 hr 30 min to Sandy McNabb in the park. About 20 min from Okotoks to Black Diamond. Calgary has the nearest airport.

Fly shops

Flys Etc.High River
Fish Tales Fly ShopCalgary

Camping: Sheep River Provincial Park has campgrounds at Sandy McNabb and Bluerock, with equestrian and group camps beside them. Diamond Valley and Okotoks have motels and bed and breakfasts, and Calgary has everything else.

Highway 546 runs west from Diamond Valley into the park and follows the river to Bluerock, with day-use areas and pull-offs along the way. Indian Oils day use marks the top of the closed sanctuary water, and Gorge Creek marks the bottom. Below the park, reach the river at bridges and road allowances, or in Diamond Valley and Okotoks, where town paths follow the banks. The rocks at Sheep River Falls are slippery, and Alberta Parks warns of old bridge material in the river about 100 m below Indian Oils. Grizzly and black bears use the valley, so carry bear spray. No First Nations reserve lies along the river.

Sheep River

Alberta·Bow Valley and Calgary·50.63° N, 114.53° W

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Fishing: Good
Flow: 2.2m³/s; Steady · high for November; Sheep River at Black Diamond
Water temp: —

Flow

2.2m³/s

Steady ·

Sheep River at Black Diamond

Water temp

—

Normal range

1.2–2m³/s

Median 1.6 m³/s

Weather

6°C

Mostly Clear