The lake is an hour of driving, then an hour of hiking. It is in a steep-walled, forested bowl, and makes for a nice swim on a hot day. The only reason to come may be for the excellent Boundary Lake Campground.
Difficulty: Easy
Elevation gain: 368m (1207′)
Key elevations: Park 1442m (4730′); Lake 1770m (5806′)
Distance: 3km one-way
Time: 2-2.5 hours
Map: 82F/2 Creston
Drive: From Creston: At junction of Hwy 3 and 3A in north Creston, drive on Hwy 3 west, 28.7km (17.8mi). Turn left (SW) on Maryland Creek FSR. Zero odometer.
From Kootenay Pass Brake Check next to Bridal Lake: Drive Hwy 3 NE 15.6km on Maryland Creek FSR. Zero odometer.
0.0 Start on Maryland Creek FSR, drive SW on gravel. 1.1km cross bridge.
2.7km Go right and ascend.
6.9km Go right at junction.
9.1km Stay right on main road through meadow and into upper valley.
13.7km At Y, go right and descend on Monk Creek FSR. Left goes to Boundary Lake.
15.5km Bear right under power lines.
18km. Cross bridge and bear right uphill.
19.5km Park 1442m (4730′).
Trail: Halfway cross a creek and go left at a fork just after. After 45-60 minutes, arrive at the log-choked NE shore of Nun Lake 1770m (5806′).
Scramble the short, steep ridge above the lake’s west shore and discover a few more lakes.
Boundary Lake Campground: Needs a BC Camping Pass ($27, assesses 1400 FS campgrounds)
Drive: From the 13.7km junction on the Nun Lake Road above:
14km Proceed straight
16.7km Bear Left on main road
18km Turn sharply right and descend
18.2km Boundary Lake Campground 1305m (4280′). 11 sites with tables, 3 wharves and a small beach.