The Skagit Fisheries Enhancement Group partnered with the Mount Baker-Snoqualmie National Forest to conduct the Lower Day Creek Feasibility Study. The purpose of the Lower Day Creek Feasibility Study was to examine the historical floodplain, alluvial fan and low gradient portions of Day Creek and Day Creek Slough between Skagit River miles 32.5-37 in order to identify, evaluate and prioritize a range of restoration and protection actions to improve salmonid habitat. As part of this study, Middle Fork Geographic Information Services completed a GIS Analysis of Lower Day Creek and Day Creek Slough in September 2004. This GIS based historical mapping and analytical project reconstructed the historic floodplain and channel system for Lower Day Creek and Day Creek Slough including the associated sloughs, side channels, historic overflow channels, wetlands and uplands. Historical observations of channel locations (primarily identified through aerial photography and maps) from 1879 to 2004 were compiled into a GIS application in order to capture the dynamic behavior of the study area hydrography over the last 125 years. Ground surveys were also conducted in July 2002 and July 2004 as part of the Feasibility Study to document existing habitat conditions for the study area. This report integrated the information of the GIS analysis and ground surveys with information about disruption of natural processes in the study area to identify and evaluate a range of potential projects that can help restore and protect salmonid habitat for Day Creek and the Lower Skagit River. The report looked at four natural processes and determined their level of impairment in the Lower Day Creek watershed as well as their impact to salmon resources. The four natural processes included: floodplain function, riparian habitat, hydrology and sediment transport, and to a lesser degree water quality (primarily temperature). All of these processes have been impaired by human impacts such as forestry practices, hydromodification, residential development, and land clearing for agricultural purposes. The report determined objectives that needed to be met to restore these processes and five potential methods in which the objectives could be met and natural processes could be restored or enhanced in the Lower Day Creek watershed. The five potential methods include: improving fish passage, removal of riprap, riparian planting, large woody debris additions and one public road improvement. Specific projects are identified and evaluated for each of these potential restoration methods. Protection actions associated with the potential restoration activities are also identified. Evaluation was completed by using the objectives for habitat benefits, economic costs, and likelihood of implementation due to social or political constraints. Finally, recommendations were made for those potential projects based on the evaluation.