From the CTF website:
SEG 12 IMPASSIBLE BLOW-DOWN: 'Heads up,' please inform others. Thanks. Inside
Wilderness where chainsaws are prohibited (may take years to clear the CT) the Seg 12 blow-down is
so extensive that it is impassible. PLAN YOUR DETOUR AROUND SEG 12. The CT Guidebook is
helpful.
Area that's Impassible: CT Seg 12 south of Pine Creek (CT Seg 12 mi 6.4) and north of Harvard
Lakes (CT Seg 12 mi 15.2). The blow-down areas are large, well beyond the trail corridor, and users
who have tried to navigate the steep terrain around them have reported they did not succeed.
I spoke with someone at USFS who says that the area looks like an explosion hit it, with thousands of trees down in a tangled mess.
If you are one of the people thinking of doing the Missouri / Oxford / Belford alternate hike then rejoining the CT that won't work either - the trip down Pine Creek will put you in the middle of this mess.
detour suggestions are at: www.coloradotrail.org