The design also included a larger pool at the downstream end of the project reach with turtle habitat enhancement features. Once the entire channel was filled with ESM, additional boulders were clustered together and spaced out over the design reach to form 60 pools that provide habitat complexity and serve as resting spots for migrating fish making their way up the ramp. These underground walls were constructed about every 50 feet and formed stream channel sections that were then filled with a mixture of sand, gravels, cobbles, and boulders known as “engineered streambed material,” or ESM. Of primary importance was creation of a stable subsurface with channel-spanning boulder sills supported by concrete buttresses. The first step in the construction process was to excavate all man-made features within the channel and then over-excavate the entire channel to accommodate the new design features. During the summer of 2020, we joined Caltrans at the construction site and assisted with monitoring the construction of the rock ramp.
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