This hike can best be described as a classic Cascade trail. It starts off as a walk through fir and hemlock forests with occasional breaks in the trees to show views of mountain lakes. The trail is well maintained and nicely graded. You will encounter several small stream crossings, and getting your shoes wet is not unlikely. The lake is surrounded by talus slopes but there are a couple camp spots at the north end of the lake.
The trailhead is shared with Granite Mountain
, so the first mile will likely by busy. Continue straight when you reach the first junction to make your way toward Prat Lake. At 3 miles you will come to a nice view point at 3,400 feet. Take a minute to rest here and enjoy the sights. Continuing on the trail, you will shortly cross into the Alpine Lakes Wilderness Area. Then, at 3.8 miles you will find a side trail to the left, that leads Talapus and Olallie Lakes
. Stay on the main trail.
About a quarter mile past the side trail you will come to a ridge, that separates the Pratt Lake basin from the Talapus and Olallie basins. Pratt Lake is located another 1.6 miles down the side trail to the right.