Whitewater Paddling & Rafting
The St. Mary River is Cranbrook’s best-known whitewater run and a popular destination for kayaking and rafting, especially in spring. Flowing west from St. Mary Lake toward Marysville, the river comes alive during snowmelt, offering fast, exciting water surrounded by mountain scenery.
Early season paddlers can expect lively Class 3+ rapids that typically last for about two months before water levels begin to drop. Later in summer, the river becomes more suitable for rafting, while kayaks and canoes may encounter shallow sections.
Recommended Sections:
- St. Mary Lake to Matthew Creek: Mostly Class 2 water with scenic pools and forested banks
- Matthew Creek to Marysville: Class 3+ in spring with fast-moving water and a short, steep hike-out near the sewage facility
Best Time: May to June (high water)
Watch For: Sweepers and downed trees around river bends
Skill Level: Intermediate to Advanced
For guided rafting experiences, visit Kootenay Rafting Co.
Fly Fishing on the St. Mary River
Born in the Purcell Mountains, the St. Mary River is a classic freestone stream flowing gently for approximately 80 kilometres before joining the Kootenay River. It is widely regarded as one of the finest dry fly fisheries in North America.
Anglers can expect wild West Slope Cutthroat Trout and Cutbows ranging from 12 to 18 inches, with reported catch rates of 10 to 50 fish per day. Thanks to limited road access along much of the river, fishing pressure is low, and solitude is common.
Fishing Season & Hatches:
- Mid-June: Stoneflies, caddis, and midges
- July–August: Attractor patterns perform well
- September–October: Terrestrials dominate, with Blue Winged Olives emerging mid-day through October
Private launch access is available through local guides. For fly fishing guide services, visit St. Mary Angler.
Hiking & Trails Along the River
Several scenic hiking routes follow the St. Mary River corridor, offering easy access for both visitors and locals. These trails provide peaceful forest walks, river views, and opportunities for wildlife spotting.
Popular routes include:
Cycling: North Star Rails to Trails
Running alongside portions of the St. Mary River is the North Star Rails to Trails, a paved multi-use pathway connecting Cranbrook and Kimberley. This 26 km (16 mi) trail features gentle grades and is ideal for families, commuters, and casual riders.
Nestled between the Purcell and Rocky Mountains, the trail passes through forests and grasslands and crosses the St. Mary River near its midpoint. It is heavily used for exercise, sightseeing, and social rides.
Completed in 2010 and adopted into the Trans Canada Trail in 2012, the route includes bike repair stations at both trailheads. The main Kimberley access point is at Rotary Drive across from the Aquatic Centre, while the main Cranbrook trailhead is located at Collinson Road. The trail is maintained for spring, summer, and fall use, with partial winter maintenance.
