You need at least three. This map does not show the return part of this trip.
Quadrangles show the return section along the firebreak.
In any case, the trail is difficult to follow on the ground part of the way, so the map isn't that helpful, just as a general guideline for proper direction. Drive past the Visitor Center keeping to the right until you find the stream crossing. Park in the wide spot. The Silver Moccasin Trail is marked with a brown carsonite stake. Round trip is approximately 5 miles.