Santa Maria Rivermouth, also known as Guadalupe Beach, is a surf spot located at the end of Hwy 166 from Guadalupe. This area features sandy beaches and is known for its consistent surf. The road leading to the beach can sometimes be covered with sand, giving it a unique beach vibe. It's a great spot for surfers looking for a day out on the waves.

The surf here is known for being powerful and hollow, offering a solid beach break that tends to stay active and never flat. It's best suited for swells coming from the west, but it can also handle south and north swells. You’ll find waves breaking over sand, creating both left and right wave directions. The spot usually works well with swell sizes starting at 2ft (about 0.6 meters) and does best with mid tide heights. Just keep in mind that the wind tends to be strong, with east being the preferable direction, and currents can get a bit tricky at times.

After heavy rainfall, the mouth of the river can produce an excellent sandbar, which is a bonus for surfers. The conditions here can change quickly based on the weather and river flow, so it's always good to check the surf forecast before heading out. Overall, Santa Maria Rivermouth offers a decent session for those looking to catch some waves, especially with the right conditions.