Much of the Merced River basin is at high elevation, where an alpine climate prevails. The Sierra receives heavy snowfall in the winter, which melts in the spring and early summer causing annual flooding. By late autumn the river level has dropped considerably, and some smaller tributaries dry up altogether. Up to 85% of the flow above Happy Isles comes from melting snow. In the dry season, groundwater provides the only base flow to the river. In addition, the river is fed by dozens of high Sierra lakes, the largest of which include Merced Lake, Tenaya Lake, Ostrander Lake, the Chain Lakes, and May Lake. The foothills experience a drier Mediterranean climate, while the San Joaquin Valley floor is dry enough to be considered semi-desert.