Where the Crowsnest, the Castle and the Oldman meet a wall
The Oldman River Dam, finished in 1991 north of Pincher Creek, sits exactly where the Oldman, Crowsnest and Castle river systems converge. Building it took years of court challenges and a standoff with Piikani protesters led by Milton Born With A Tooth, and today the ATCO hydro plant at the dam, 25 percent owned by the Piikani Nation, can generate 32 megawatts. For an angler the dam splits the river in two. Above the reservoir the Oldman is a mountain and foothill stream that starts in the Beehive Natural Area and runs down through the Livingstone Gap. Below the dam it is a bigger, regulated river headed for Fort Macleod and Lethbridge, 362 kilometres in all before it meets the Bow and forms the South Saskatchewan.
Wikipedia's species list for the river runs from rainbow, cutthroat, bull and brown trout and cutbow hybrids to pike, walleye, goldeye and lake sturgeon farther downstream. The Crowsnest Angler in Bellevue, guiding in this corner since 1984, floats the Oldman and describes it as rainbow, cutthroat and bull trout water.
The tailwater, dam to Secondary Road 509
Alberta's 2026 ES1 table treats the first reach below the dam as its own water, from the Oldman Reservoir dam downstream to Secondary Road 509, with a bait ban all year and three seasons. From April 1 to June 15 it is catch and release for trout and whitefish. From June 16 to October 31 you may keep 2 trout in total: rainbows and cutthroat over 35 cm and browns over 40 cm, plus 5 whitefish over 30 cm and 3 pike. From November 1 to March 31 it reverts to 0 trout. Bull trout are 0 everywhere in Alberta. Below Road 509 the river moves into the PP1 prairie zone, open May 8 to March 15 with walleye, pike and burbot limits on top of the trout.
This is float water. Crowsnest Angler runs its drift boats here with a maximum of two anglers per boat, and it lets you reach runs that wading anglers never see.
Reading Brocket in cubic metres
The gauge on this page is the ECCC station near Brocket, below the dam, so it shows the releases more or less as they leave the reservoir. No shop publishes a target number for it, so the 600 to 2,000 cfs range here comes from ECCC's long-term monthly means for the months people fish it: about 57 cubic metres per second in July, 33 in August, 24 in September and 18 in October. May and June average 100 and 125 m3/s, which is high water for wading. In winter the river drops to around 9 m3/s. On September 24, 2026 the station read 21.4 m3/s, about 756 cfs, right on the fall average. Reservoir level matters too: Bow River Troutfitters reported the Oldman Reservoir at just under 30 percent of capacity during a dry winter, and a low reservoir means little room for generous summer releases.
Up the Gap: Racehorse Creek, Highway 22 and the Livingstone
Above the reservoir the regulations change every few kilometres, and they tighten as you climb. From the headwater down to Racehorse Creek the mainstem opens June 16 to August 31 and again September 1 to October 31, catch and release for trout both times. Racehorse Creek down to Highway 22 is open June 16 to October 31, again 0 trout. From Highway 22 down to Secondary Road 510 the river opens earlier, April 1 to June 15 with 0 trout, then from June 16 to August 31 allows 2 trout with rainbows and cutthroat over 35 cm, and goes back to 0 trout from September 1 to October 31. The Livingstone River and its tributaries are open June 16 to October 31 with a trout limit of 0. The bait ban applies to all of it.
June 16 is the date that matters. Bow River Troutfitters calls it mountain stream opener and describes crowds and some jockeying for spots on the well-known southern waters that week, so give people room. Westslope cutthroat and bull trout are both listed as Threatened under the federal Species at Risk Act; handle them in the net, keep them wet, and the same shop suggests carrying a thermometer and stopping at 19 C.
Stoneflies first, hoppers last
Crowsnest Angler's hatch chart for the neighbouring Crowsnest gives the regional timing: salmonflies late May to late June, golden stones June 5 to July 15, PMDs and western green drakes from mid to late June, caddis June through October, and hoppers from August 1 to the end of September, with olives on both ends of the season. Bow River Troutfitters adds that fish on the Oldman system eat golden stones off the surface through early summer, and that green and brown drakes in sizes 10 to 14 are worth carrying on the eastern slope streams. The shop's broader advice for the region is that early July through September is the most reliable window, because runoff usually runs from mid or late May into late June.