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Caption: This chart displays d16, d50 (median), and d84 particle sizes from sub surface samples of pool-tails measured in Lagunitas Creek at Big Bend (monitoring site KD) from 1980 to 2000. Data were collected by Balance Hydrologics, Inc. for the Marin Municipal Water District. The decrease in particle size from 1993 to 1995 may represent an influx of fine sediment which subsequently flushed after high flows in 1998-1999. Bed core samples were not taken in locations where spawning might occur and are not intended to characterize spawning conditions (Prunuske Chatham, Inc., 2000). See Map to view sediment sampling locations and Info Links for more information.
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