Notice to Mariners - Changes in the Boulder Basin
Contact: Roxanne Dey, (702) 293-8947
Lake Mead National Recreation Area Superintendent William K. Dickinson announced the following changes in Aids to Navigation in the Boulder Basin on Lake Mead. Due to fluctuating water levels, the Castle Reef Light #4 has been established at:
36 degrees, 3 minutes, 25 seconds north
This aid will show a “Flash” sequence. This light is on for 0.4 seconds and off for 3.6 seconds. The sequence is then repeated.
Lake Mead National Recreation Area is a unit of the National Park Service.
Did You Know?
As early as 3,000 years ago, people inhabiting the Southwest began chiseling and painting pictures on rocks and cliff walls. Preserved by the dry climate, much of this rock art ranging from complicated geometric designs to huge figures, remains to puzzle, astonish, and awe modern-day viewers.