Stream temperature has been and continues to be of concern in forested watersheds throughout Northern California, where timber management has been practiced for over a century. There has been a heightened awareness of the effe cts of altered stream temperatres on salmonids and other aquatic/riparian species. Several regulatory measures have been promulgated to mitigate impacts of increased water temperatures on aquatic biota. Restoration acti vities have been initiated, conservation measures developed, and land use practices altered in an attempt to counteract potential alterations in stream temperatures throughout the state of California and the Pacific Nor thwest. Land stewards in the private and public sector have been gathering temperature data for several years. With the onset of continuous temperature sensor technology, large volumes of stream temperature data are now being assembled and analyzed. More and more state and federal agencies and private landowners are choosing continuous stream temperature monitoring devices over thermometers because of the need for diurnal and seasonal water temperature data.