South Lemon Creek Material Source Stormwater Outfall, Juneau, Alaska

SOUTH LEMON CREEK MATERIAL SOURCE is a stormwater outfall located in Juneau, Alaska, United States. It serves the Lemon Creek Valley area, managing stormwater runoff from urban and industrial catchments. As a stormwater outfall, it discharges collected stormwater into local waterways. Operated under the US EPA NPDES MS4 permit framework, this facility is part of a regulated system designed to control pollution from stormwater discharges. The City and Borough of Juneau likely operates a Phase II Small MS4 program, requiring stormwater management plans to reduce pollutant loads. The outfall's location in a valley with residential and commercial development influences the runoff characteristics. The environmental significance of this outfall lies in its role in protecting downstream water quality in Lemon Creek and ultimately the Gastineau Channel. Proper management of stormwater from this outfall helps mitigate flooding, erosion, and contamination from urban runoff. The facility contributes to the community's stormwater infrastructure, supporting local water quality goals.

Juneau's coastal rainforest climate produces high annual precipitation, making stormwater management critical. The outfall discharges into Lemon Creek, which flows into the Gastineau Channel, a marine waterbody supporting salmon runs and other aquatic life. Urban runoff from roads, parking lots, and industrial areas can carry pollutants such as sediment, heavy metals, and hydrocarbons. The facility's location in a valley with steep terrain increases runoff velocity and erosion potential.