The Cedar Portage Watershed (HUC 04100010) covers an area of approximately 1,094 square miles in Minnesota. It is a part of the Rainy River- Lake of the Woods Watershed and is drained by the Rainy River and its tributaries. The hydrology of the watershed is mainly influenced by snowmelt and precipitation. Snowpack in the area is typically deep and persistent, with average snow depths of around 50 inches during peak winter months. Surface water in the watershed includes numerous lakes and wetlands, including Lake of the Woods, which is the largest lake in the watershed. Reservoir constituents in the area include fish populations, which support commercial and recreational fishing. Interesting climatic facts include the area's high annual snowfall and occasional severe winter storms. In recent years, the region has experienced an increased frequency of heavy precipitation events, which could impact surface and groundwater quality.