Set out from the trailhead at 4:15pm on Wednesday evening. Had a wonderful hike along the river and up through the woods. Saw a few other day hikers and returning backpackers on our way up. The hike up to Echo is well maintained, with only a few easily navigable blowdowns. Ran into snow above the switchbacks, which is quite icy in places but easily passable if you take your time. Will likely have all melted within a couple weeks.
Made the short descent to the lake and chatted with another couple of backpackers who pointed us toward a nice campsite on the west side of Echo. We set up camp and enjoyed the waning light until 10pm. There were some mosquitos, but not bad at all.
We decided to hike around the south side of the lake and day hike up to Arch Rock the next morning. The trail is obvious and well signed for the first couple miles, and then gets tough to follow around blowdowns. There is pink trail signing tape up in some places. We made it about three miles, to the second snow chute, before we lost the trail completely in the snow and decided to call it for the day. Had a lovely lunch atop a large rock in the snow field and headed back to camp. Saw bear scat and lots of elk tracks/scat but didn't see any of the creatures themselves.
Attempted some fishing early the next day, and though we saw lots of trout swimming and surfacing, never had any luck. Lazily packed up camp and enjoyed the solitude of the beautiful and still lake before departing. Again saw lots of elk tracks and droppings on our descent back to the trailhead.
NOTE: we found lots of trash at our campsite (filled dog poop bags, liquor bottles, and garbage), and saw more at other campsites. If you visit the lake, please practice good leave no trace etiquette. We packed out some of the poop bags, in addition to those of our own dogs. Maybe we can all bring a little bit out with us and restore these otherwise lovely campsites to nature.