The sandbar at the estuary mouth of Pescadero/Butano Creeks in coastal San Mateo County fully breached sometime between the late evening of Oct 31, 2016 and the early morning of November 1, 2016 (Figure 1). The breach initially started as a shallow surface connection of the lagoon to sea over the sandbar on October 30 (Figure 2). Both the shallow and full breach of the lagoon were associated with the significant amount of runoff the watersheds in the area received from a series of storms between October 14th and 31st (Figure 3).

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