We arrived at the Smith Brook trailhead at 7:30 Friday evening, under partly cloudy skies and were on the trail to Union Gap and Janus lake by 7:45. The local winged vampires showed up immediately, necessitating an immediate DEET bath prior to shouldering our packs.
Trail up to Union gap is pretty muddy once you hit the last 200' of gain, there are still some large snowbanks in the trees and over part of the trail. A string of muddy bootprints are easy to follow to where the trail reappears. The snow is gone from Union Gap all the way to Janus lake, and the trail has no blowdowns or slide problems.
Arrived Janus Lake about 9:10, set up camp racing the darkness. The lake is thawed, no snow visible on shore but some still lingers in the trees. All campsites appear melted out, there is still a LOT of water in the area and making one's way to the lake or between campsites means squishing along through many mudholes. The flowers are blooming and a family of ducks are living on the lake. Of course the bugs closed in the instant we stopped moving, so we dosed on DEET again.
We stayed up till about 12:30, watching shooting stars and seeing ominous flashes of light in the distance. About 3AM, the sky was rent by a tremendous !BANG! *RUMBLE RUMBLE* and the party began. Rain poured and the thunder rolled for the next two hours. The storm was gone by dawn but the clouds remained, sprinkling light mist and drizzle all of Saturday, and Saturday night, into Sunday morning.
We saw 5 parties come in on Saturday, and between the bugs and the rain, two decided to bag it and head right back out. Numerous day hikers poured in as well, making it obvious that if you're after solitude, Janus lake isn't your spot. At one point I could hear 3 separate conversations from 3 campsites.
It's also not a good place in early season if you can't tolerate bugs, the hordes were only kept at bay by repeated applications of high concentrations of DEET, my buddy's ""Skintastic"" with OFF brand repellant in it only worked for a mere 30 minutes or so, and he finally broke and wanted to use good old Jungle Juice.
Sunday morning the clouds lifted and the rain stopped, but the skeeters were worse than ever. We bailed at 1:30, with the sun finally making some headway against the cloud deck, enough to dry our gear before we packed.
All in all, a nice short hike, trail in good shape except for mudholes.