Alpine Lake is the largest reservoir in Marin County's Municipal Water District system, located in the Mt. Tamalpais watershed near Fairfax. This scenic 224-acre lake is nestled in a forested canyon at approximately 650 feet elevation, surrounded by Douglas fir, redwood, bay, and madrone trees that provide shade and natural beauty along much of the shoreline.

**Access and Regulations:** No boating, swimming, or kayaking is permitted on Alpine Lake, as it serves as a drinking water source for Marin County residents. The reservoir is part of the Marin Municipal Water District's protected watershed, which supplies 75% of Marin's domestic water. To prevent contamination, all watercraft, swimming, and body contact with the water are strictly prohibited. Dogs are also not allowed in the water.

**Hiking and Shore Access:** While paddling isn't an option, Alpine Lake can be enjoyed from several excellent hiking trails. The Kent Trail follows portions of the northern shoreline, offering close-up views of the water. The Azalea Hill Trail provides access from Bolinas-Fairfax Road, and various connecting trails create loop opportunities around Bon Tempe Lake and along Alpine Lake's edges. The trails through this area pass through diverse terrain including open meadows with wildflowers in spring, shaded forest sections, and rocky outcroppings.

**Scenery and Wildlife:** The lake offers stunning views, particularly from elevated trails and the Bon Tempe Dam. Wildlife is abundant, with opportunities to spot deer, ospreys, bald eagles (which nest in the area), river otters, and various waterfowl. The peaceful setting and dramatic canyon topography make this a popular destination for hikers and photographers, though paddlers must seek other nearby waters like Tomales Bay or Richardson Bay for on-water recreation.