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Caption: PH was measured at twelve locations, with varying frequencies, in the Stemple Creek watershed by the North Coast Regional Water Quality Control Board (NCRWQCB) from 1990-1994. The graph shows data collected at five locations (going downstream from left to right) from 1992-1993. The reference value represents the North Coast Regional Water Quality Control Board (NCRWQCB) Stemple Creek TMDL threshold pH range (7-8.5) to be met by 2004 during late spring and early summer (Salisbury, 1997). See Picture for monitoring locations and Info Links for more information.
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