Happy Isles
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Happy Isles is located where the slope of the Merced River changes from the much steeper upper main stem to the essentially flat Valley floor. At Happy Isles, the river gradient is approximately 2%. The gradient of the Merced River at Happy Isles is steeper than in the Valley floor, and the channel of the river is cut into erosion-resistant granitic boulders and talus materials, compared to channel deposits of sands and gravel present on the Valley floor. The steeper gradient and composition of streambed materials together impede meandering patterns from developing in this area.
The area near Happy Isles sustained damage in 1996 during a rockslide. A number of signposts near the Isles are dedicated to the rockfall.
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