Distance: 10 km
Elevation gain: 590 mView mapDownload GPS track
We'd been wanting to do this hike for awhile, but were put off by the descriptions of how tough it was. While not easy, the only challenge is the elevation gain over such a short distance (~500 m over maybe 2 km), but there is no scrambling required and as long as it doesn't rain it shouldn't be too difficult.
The trail is city park easy for the first 2 km to Warspite Lake, and from there you can see the ascent route to the lakes which generally follows the cascade up. It is steep, but much less so than the view suggests. From the lake the trail curves around the right (north) side of the lake, crosses an avalanche slope, then moves across a boulder field. The trail is obvious to the boulder field. Keep an eye out for cairns which will guide you off the boulders to a well worn trail ascending the slope quite a bit to the right of the stream.
When the trail comes up next to the stream at the Warspite Cascade, head right and follow it up a steep (slippery when wet) slope, shortly emerging in upper Black Prince cirque. To get to Black Prince Lakes, head roughly to the back of the cirque, sticking to the right. See the photos for a better description!
All considered, a great hike and one heck of a workout! At a slow but steady pace it's about an hour and 45 minutes to the cirque and another 25 minutes to the lakes. If you're looking for photos, do the entire hike before noon for the best light.