Runout -
I work at Pinnacles as a biologist and manage the closures. Feel free to send me an email if you'd like.
In regards to signs, there are closure signs that are up and affixed to metal brackets, at the main access point to Balconies along the Balconies Cliff Trail (near Smiling Simian), and at the top of the access trail to Tilting Terrace. I affixed them for the season on January 19th, so they have been in the ground for over a week. Basically, anyone climbing Lava Falls would have had to walk right by the main sign along the Balconies Cliff Trail.
I do have a bulletin board poster that is current and reflects closures at the bulletin board across from the Juniper Canyon trailhead. Unfortunately there isn't room near the bathrooms for placing another poster at the bulletin board fixture there... The bulletin board leading to the Juniper Canyon trailhead is the best I can do with the existing infrastructure.
I have also given out closure handouts to gyms throughout California to post in the gyms, and I give copies of the handouts to interpretation staff on the east and west sides of the park to disperse to visitors. Some staff are more motivated to do this than others, but I will remind interpreters and visitor use assistants to make use of the handouts.
Finally, I have current lists of closures here on Mud N' Crud, also on the Friends of Pinnacles website, and there is a link on current closure conditions on the official Pinnacles website. (I was a bit late getting that last one updated, but it is current now.)
Beyond that, any help that climbers can provide to enforce closures as a responsible community are greatly appreciated... I do so myself when I am out climbing and hiking in the park, and hopefully other climbers and hikers feel comfortable doing the same. Ultimately it is our collective motivation as stewards of the park that make the advisories/closures work or not, since we have limited NPS staff at the park and can only do so much, So if you see folks in closure areas, please let them know!
Thanks for your concern and support. I'll do what I can to try to push for more handouts and a sign-in sheet for climbers on the west side.