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Marin Municipal Water District does not actively promote this pretty lake tucked into the hills of North Marin, probably because it is surrounded by private land.
Fishermen and hikers are few and no boats or swimming are allowed.
There are two possibilities for hikes, one on the west side of the dam along the ranch road that brought you in, and one along a trail on the east side of the dam used mostly by fishermen that grows faint and then fades out. Climb to the ridge for forever views.
Trash and recycling cans are available on site, as well as port-a-potties.
A tip: the name of the lake is pronounced Soo-la-HOO-lee. Dogs must be leashed.
The water district provides these directions from the town of Nicasio:
Head northwest on Nicasio Valley Road (drive 3.2 miles). Turn right on Point Reyes-Petaluma Road (drive 4.3 miles). Turn left onto Hicks Valley Road (2.7 miles). Turn left onto Marshall-Petaluma Road (3 miles). Turn left at 1400 Marshall-Petaluma Road onto Arroyo Sausal road and enter through the gate. Follow the gravel road and turn right at the bridge.
Park in the parking lot at the base of the dam (1.4 miles from Marshall-Petaluma Road).