| Area   | 
         S.F. Trinity  | 
     
     
         | Topic | 
         Temperature: Min, Max & Avg Hayfork  (NRCS Site 02) @ Mercill Br 1995 | 
     
 
 
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   Caption:  The water temperature at Mercill Bridge on Hayfork Creek, in lower Hayfork Valley, was acutely stressful for salmonids into late summer, with even the minimum water temperature above stressful. High water temperatures at Mercill Bridge are exacerbated by water withdrawals and riparian conditions related to agricultural activities in Hayfork Valley upstream. Data collected by the Trinity County RCD and Weaverville office of the USDA Natural Resources Conservation Service. See Picture for a map view of gauge location.
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