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The influence of stream temperature on the survival and reproductive success of anadromous salmonid populations has become an increasingly concerning issue in the Pacific Northwest. Enhancing the height, density and extent of riparian vegetation is widely accepted as one of the most effective strategies for reducing stream temperatures, while also providing numerous ancillary benefits. Effective shade is defined as the percentage of direct beam solar radiation attenuated and scattered by riparian vegetation before reaching the stream surface and is a commonly used criterion for choosing where to restore riparian vegetation. This project aims to prioritize sites for riparian restoration through effective shade modeling within the geographic extent of the Johnson Creek watershed. Model inputs included a limited set of channel morphology and near stream vegetation attributes and were sampled from high spatial resolution LiDAR derived raster datasets (6 ft.) using Python script programming tools. A separate raster was created to depict restored conditions, in which the maximum height of near stream vegetation is set equal to 27 meters. Using a data intensive stream temperature model, Heat Source, effective shade simulations were performed along the mainstem Johnson Creek and all tributary streams over the duration of a single day in August. Model outputs provided average solar flux attenuation rates for near stream vegetation under current and restored conditions, the difference of which represented the potential increase in solar flux attenuation that would result from restoration. Model outputs were used to prioritize restoration efforts at the taxlot and subwatershed scale. Under a restoration scenario, 544.9 acres would be restored resulting in the additional solar flux attenuation of 209,118.9 watts/m*d. Restoring only 22% of all taxlots, 50% of all subwatersheds, or 21% of all restorable acres would accomplish 50% of the solar reduction target. Restoring 38% of all taxlots, 69% of all subwatersheds or 55% of all restorable acres would accomplish 90% of the solar reduction target. A large portion of taxlots (40%) exhibited no difference in solar flux attenuation between current and restored conditions. Prioritizing at the taxlot scale, as opposed to subwatersheds, promotes a higher level of efficiency in the prioritization of restoration efforts. All taxlots should be further screened prior to final prioritization for opportunistic prospects such as landowner willingness, community support or proximity to existing restoration projects, and fundraising opportunities.

Modeling Effective Shade to Prioritize Riparian Restoration Efforts in the Johnson Creek Watershed, OR