Alpine Dam – Alpine Lake loop from Mill Valley

The Alpine Dam – Alpine Lake loop from Mill Valley is a classic road cycling route that truly earns its reputation as a challenging yet incredibly rewarding ride. This difficult 41.1-mile (66.1 km) loop packs in 4233 feet (1290 metres) of elevation gain, typically taking around 3 hours and 33 minutes, making it perfect for experienced cyclists looking for a serious workout with unparalleled views.

What to expect on Alpine Dam – Alpine Lake loop from Mill Valley

As you embark on this journey, the initial miles through towns like Ross and San Anselmo offer a gentle warm-up before the real climbing begins. You'll soon find yourself winding through the Mt. Tam Watershed, past the serene waters of Alpine Lake, and into dense redwood and oak forests. The route features significant climbs, particularly on Fairfax-Bolinas Road and near Alpine Dam with its challenging switchbacks, culminating in the notorious 'Seven Sisters' on Ridgecrest. From the ridge, prepare for unforgettable panoramic views stretching across San Francisco, the Golden Gate Bridge, and the Pacific Ocean. This route is best suited for cyclists with good to very good fitness who are comfortable with steep ascents and fast descents.

Planning your visit

While SOURCE B doesn't mention specific permits or closures, this challenging route demands careful planning. Starting from Mill Valley, consider riding counter-clockwise, which is often recommended for safety and to optimize the majestic views and descents, leading to a safer finish down Panoramic Highway. The best time to cycle Alpine Dam loop is typically during drier seasons to avoid 'greasy' corners on descents. Always check the weather forecast Alpine Dam bike ride before you head out, and ensure your bike is in top condition for the significant climbs and descents.

Trail details

• Distance: 41.1 miles (66.1 km)
• Elevation gain: 4233 feet (1290 metres)
• Difficulty: difficult
• Estimated time: 3 hours and 33 minutes