A rare and captivating event is unfolding at Lake Berryessa Glory Hole in Northern California. This spillway, which locals often refer to as the “Glory Hole,” is active for the first time since 2019, according to Jennifer Onufer from the Bureau of Reclamation, which oversees water management in the Western U.S.
This occurrence has led to a breathtaking vortex, spanning 72 feet across the lake’s surface. Onufer mentioned that this phenomenon could remain visible for about three more weeks, depending on weather conditions.
How the Lake Berryessa Glory Hole Works
Although some visitors find the swirling water eerie, it actually signals that the Lake Berryessa Glory Hole spillway is functioning correctly. The spillway prevents structural damage to the Monticello Dam by channeling excess water when levels surpass a specific height. While most reservoirs use chute- or shaft-shaped spillways, the space limitations at Lake Berryessa required a unique funnel-like design.
Once the water enters the opening, it is transported through a massive underground system and released into Putah Creek. According to historian and scientist Peter Kilkus, this type of spillway is quite rare—only two exist in California, with a few others found in Europe.
Increased Interest in the Lake Berryessa Glory Hole
The spillway became active on February 4, following a particularly wet winter that raised the lake’s water levels. By February 14, the water peaked at 443 feet, just above the spillway’s activation threshold of approximately 440 feet above sea level.
Due to the renewed activity of this natural spectacle, authorities have cautioned travelers about heightened traffic along State Route 128. Additionally, visitors arriving by boat are encouraged to follow new protocols to help prevent the spread of invasive mussels.
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Source:www.people.com
