This image shows the protected anchorage on Lake Tahoe called Emerald Bay. It is a popular stop for tour boats.
The description states:
EMERALD BAY – LAKE TAHOE
“Breathtakingly Blue” well describes this jewel of Lake Tahoe. In its pine-fringed setting. Emerald Bay on the southern shores of Lake Tahoe is a popular vacationland. The Nevada shores and mountains rise in the distance.
–Lake Tahoe lies at the bottom of a mountain-ringed basin, and the mountains behind the photographer in this view are the much taller Sierra Nevada range.
This card likely dates from the 1950s.