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Caption: The chart shows the average percent of the stream bottom covered by different substrate types taken from a habitat typing surveys of Lagunitas Creek and San Geronimo Creek in 1998 and 1999 conducted by Marin Municipal Water District. San Geronimo Creek above Larsen Creek shows signs of sediment problems with the bottom of the stream more than half covered in silt and sand. Reaches showing high components of bedrock may be trending towards gravel starved as high flows flush gravels but new recruitment is partially blocked by dams. See Info Links for more information.
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