First, some links on the USFS site pertaining to
Closure Order 13 - 18.
There are two logical sections to the Mountain Fire Closure PCT bypass:
1. Paradise Corner area to Lake Hemet
2. Lake Hemet to the S Ridge Trail.
The S Ridge Trail then rejoins the PCT near Little Tahquitz Valley.
I think the section beyond Lake Hemet is the trickier to bypass. Here's my thinking on the beyond Lake Hemet section:
If you follow the above links, you'll get this map:
I see May Valley Road (5S21) highlighted in bright yellow, meaning that it's closed. For that matter, anything due east of Keenwild is closed. The lower section of the S Ridge Trail (below ~6500 feet, marked as trail #3E08
.3 on the map) is also closed.
Therefore, the route past Lake Hemet (going North) that I originally marked on my
interactive Mountain Fire PCT bypass topo map using the gold colored line is probably not going to be acceptable to the USFS. I've re-marked the sections of that possible bypass in red that are currently closed.
Because the May Valley Road route is probably no good, I marked out a route in dark blue to the west. This blue route generally follows telephone maintenance roads until it goes north of Hwy 74. North of 74, it's following back roads and some marked trails. I think it would work, but it really needs someone to scout it/GPS track it.
Regarding the first part of the bypass, from Paradise Corner to Lake Hemet, I agree that Thomas Mountain Road isn't a very good bypass. It adds a lot of miles, you'd be sharing the route with cars, and there's not a lot of water.
So, I looked harder. The route marked in yellow is what I came up with. It parallels Hwy 74 to the west. It looks doable, but it needs scouting/GPS tracking.
HJ