San Luis Obispo Creek is a stream, about long, in San Luis Obispo County, California. It drains a large coastal watershed that includes the city of San Luis Obispo, emptying into the Pacific Ocean at Avila Beach. Geography San Luis Obispo Creek begins in the Santa Lucia Mountains, at Cuesta Pass in the Los Padres National Forest. It flows south down a steep canyon below the Cuesta Grade of U.S. Highway 101 and turns to the west after receiving Reservoir Canyon Creek from the left. Entering the city of San Luis Obispo it turns southwest, flowing through residential areas and past San Luis Obispo High School. The creek flows in a man-made channel as it approaches downtown west of Johnson Street. At Osos Street it enters a concrete tunnel about long passing beneath downtown San Luis Obispo. After emerging from the tunnel it flows past Mission San Luis Obispo de Tolosa, and then receives Stenner Creek from the right just upstream of Marsh Street. Below Marsh Street, the creek flows south in a natural channel along the east side of Highway 101, then flows through industrial areas and farmland in the southern part of the city. Near Los Osos Valley Road, it receives Prefumo Creek and Froom Creek from the right, before leaving the city limits of San Luis Obispo. It enters a canyon along the east side of the Irish Hills, receiving the East Fork of San Luis Obispo Creek and Davenport Creek from the left, then turns sharply to the west, leaving the route of US 101, and receives See Canyon Creek from the right. Approaching its mouth, the creek forms a small estuary before emptying into the Pacific Ocean at San Luis Obispo Bay, just west of Avila Beach. Watershed The San Luis Obispo Creek watershed covers . Most of the watershed consists of rangeland and open space, with some farmland and orchards. About 11 percent of the watershed, mostly in the city of San Luis Obispo, is urbanized. The watershed experiences a moderately wet Mediterranean climate, with a mean annual rainfall of . The East Fork of San Luis Obispo Creek is the largest sub-basin, and drains most of the southern part of the city of San Luis Obispo. Stenner Creek, the second largest sub-basin, drains northern San Luis Obispo and includes the tributaries Brizzolara Creek and Old Garden Creek. Brizzolara Creek flows through the Cal