Big Rivermouth, situated near the township of Mendocino, is part of the Big River's vast estuary. This area is known for its shallow and somewhat washy waves, making it a spot that's usually best at high tide when small, peaky swells come rolling in. It’s pretty straightforward to access from Highway 1, and the sandy beach can be inviting, especially for those just starting out on a surfboard.

The surf at Big Rivermouth generally caters well to beginners, with playful waves that run both left and right over a sand bottom. You can expect swell sizes between 4 to 8 feet (about 1.2 to 2.4 meters), which work nicely with the right swell directions coming from the south or north. While the waves can get sectiony, there are still some fun rides to be had, especially when the tide is high. Overall, it's not the most competitive spot, so you can enjoy a more laid-back atmosphere here.

Access to Big Rivermouth is straightforward; you can park in the lot behind the church and take a staircase down to the beach. This spot is not too crowded, and the local vibe is generally mellow, allowing you to catch some decent waves without too much hassle. It’s a good option for longboards and funboards, especially during the autumn and winter months when the conditions are more favorable.