...The Rincon spur is also superb fun wheeling. Is it open or closed-depends on who you talk to. I've been there and back 3 times and not sure if I'll get there again, but it doubles the sketchy fun of this trail...
Unfortunately it's pretty black/white. Who do you talk to? The National Park Service who has undisputed management control over that area as a whole, does and has considered the Rincon Trail closed since their 1979 Travel Management Plan. Now the counties are working to gain title/claim/row to that road through a process called RS2477, they too will advise that it's not considered open in the meantime and "don't ask us to help fight a ticket". If anyone has a valid reason/opinion on how it's open, I'd certainly love to hear about it. I've personally spent a great deal of time on the phone with county and NPS reps about this trail, it's on the counties radar but waaaaay down the list given the short duration, lack of private or standard BLM land access and duration it's been closed (GSENM routes are high on the list for example). From the fed perspective, they are open to discussing it and can't readily cite any reasoning why it was closed in 1979 however they are not jumping to help open it either. The fed land managers in the NPS/FS realm seem to have a mission declassify and reduce OHV routes as a whole in the west. Fortunately our counties are very proactive against (see GSENM/Bears Ears). Putting my Tread Lightly and Utah State Trail Host hat on, I can only implore that users will respect any and all land status's and route closures and work within the system to open them up. If you arrange a protest ride with the San Juan County Attorney and Council members (OHV loving folks fwiw) then have at it. Make some noise! It a popular way to get the Fed's attention here in Utah (Hidden Splendor, Recapture, Paria, etc). If you're just there to poach the trail, it only harms our relationship and potential outcome.
ExpeditionUtah made an official comment regarding the Rincon Trail during the last travel management revision and more recently (March 2018) we made official comment on their DEIS findings, which sadly didn't open the trail.
"..Rincon Trail:
We feel that the Rincon Trail should be re-opened to allow historic motorized (OHV) travel. This route has been continually open for public passage long before the creation of GCNRA and it route access along the Hole-in-the-Rock Trail (east side of lake) and the Rincon route to the lake proper should be open to motorized travel. OHV users (Jeeps at the time) were using this route for pure recreation purposes as early as the 1950’s and this access should be protected and promoted. Please reference the accompanying map (Rincon Trail Map) for the route we feel should remain open to all motorized travel..."
If anyone is reading and still isn't bored to death, you can read more and see maps re: Rincon here:
http://www.expeditionutah.com/forum/index.php?threads/glen-canyon-deis.3863/page-4#post-63105