Mammoth Lake Tightens November Access, Then Limits Diving to Members and Authorized Shops

Mammoth Lake Texas has published a two-stage access schedule for the remainder of 2026 that materially changes how independent divers can use the Lake Jackson training site.

From November 1 through November 15, weekend day passes remain available, but divers must reserve in advance. The operator requires the day pass and waiver to be completed before arrival. If a desired date is no longer shown online, the booking cutoff has passed and visitors must select another available date.

From November 16 through December 31, access becomes more restrictive: diving is limited to Platinum Members and Authorized Dive Shops, and reservations remain mandatory. Independent visitors who are not covered by one of those categories should not assume they can buy a walk-up pass or enter with an unaffiliated group.

The restriction matters beyond casual recreation because Mammoth is used for open-water checkout dives, continuing education, technical training and public-safety work. The facility supports air, nitrox, oxygen and closed-circuit rebreather operations, but access to those services does not override the published reservation and eligibility rules.

Divers using the November 1–15 public-access window must bring proof of certification and arrive with a prearranged buddy. Mammoth prohibits solo diving and does not guarantee that another visitor will be available to pair up at the site. Students may dive under direct supervision as part of an approved training activity.

Anyone planning a late-November or December trip should contact Mammoth or an Authorized Dive Shop before making travel arrangements. The published schedule is an operating restriction for the dive park, not a weather closure, and it remains in effect through December 31 unless the operator posts a change.