The Bog is not really a bog at all. It provides more great bouldering in the Poudre Canyon in an idylic setting. A large number of featured granite blocks provide a lot of problems from V3 to Vhard with mostly OK landings. Many of the problems have not had a lot of ascents, so some of the rock is a touch dirty.
The Bog is situated about 1/4 mile down the canyon (east) from the 420s. There is a dirt on the right with a curvy road sign, and a dirt road leaving the main road also on the right. Park here in the dirt pullout. Cross the stream and pick up a faint trail that leads to a talus field below the visible cliff band. The boulders are situated along a side meander of the Cache la Poudre.
Crossing the stream can be hard or easy depending on the water flow and where you go across. Look around a little bit. And DO NOT use the bridge downstream of the parking area. It is a private drive and you will piss off the locals.
I recently made a trip to The Bog and noticed a sign as well. At this time, I do not recall if they stated: "NO TRESPASSING" or "NO CLIMBING", but my buddy informed me that further up the trail it is National Forest and not private property. Any additional information on the state of this land would be appreciated.