Take Highway 20 towards Grass Valley. Turn left onto Marysville Road at the Chevron station. Take Marysville Road and follow the signs to Dobbins/Bullards Bar Reservoir. Turn right at the Willow Glen Restaurant to stay on Marysville Road. If you pass Ace Hardware you've gone to far! Then it's 14 miles to the dam. You will see the entrance to Emerald Cove Marina on the left just before crossing Bullards Bar Dam.
Take Highway 49 north from Nevada City through the town of North San Juan into the Tahoe National Forest. Make a left turn onto Marysville Road at the U.S.F.S. Ranger Station. Go south on Marysville Road for approximately 8 miles. Cross over the Bullards Bar Dam reaching the Emerald Cove Marina entrance on the right.