evdog
iMTB Rockstah
Total destruction along with monitoring/enforcement are the only things that will keep people off trails. The land manager can put up signs all they want and pile obstructions on trails or deconstruct them, but they always walk away like the problem is solved. In SD the rangers piled stuff up on trails in Deer Canyon. Lots of stuff. Slowly a few persistent individuals have uncovered those trails and now they are like open freeways again. On an adjacent parcel owned by CA Fish & Wildlife there were active ranger patrols and ticketing for awhile which kept people away as intended and for the most part people have stayed away even after patrols eased off. Around Miramar, military police issuing tickets wasn't enough to keep people away. As soon as there was a reprieve in patrols riders were right back out there. It wasn't until bikes started getting confiscated that people really started staying away. The base CO was a mountain biker and recognized that would be the only way to really get people's attention. It worked, but he almost lost his career due to the controversy.D. (my wife came up with this one). Seriously F up the trail beds on illegal trails-dig giant holes, pile big rocks, string barb wire through, etc. Obviously piles of brush at the entrances arent enough of a deterrent.
Riders are so used to poaching trails that they think nothing of riding them. Hard to blame someone when there is a fun trail with lots of recent tire tracks, and no ranger in sight. It may well take something drastic to really get people's attention and follow the rules. It would be unfortunate if all the trails were closed to bikes. Would that even work? Without enforcement/monitoring and closure of trails, it wouldn't. It might keep some or a at most the majority of casual riders away but if the trails continue to exist, people will still poach them. Some will just be more discrete than others. With so many access points it would be impossible to keep people out.
It could take a lot of advocacy work over many years to maintain access to the parks or restore it if lost.This is the time for the OC bike clubs/organizations to approach the rangers in an effort to take part in ending the actions of the offenders..
As much as people want to say more trails is the answer, that may not happen and not just because of lack of land. Down here CA Fish & Wildlife has been paying a lot of attention to proliferation of unauthorized trails. Because of the Multiple Species Conservation Plan in effect down here F&W effectively has a veto over new trails on non-federal land and they have used examples such as Deer Canyon, Miramar and others as reason to reject trail networks that have full support of the City, County and other agencies. It is going to be an uphill battle.