Codorus Creek is a tributary of the Susquehanna River flowing through southwestern Pennsylvania with headwaters originating in Maryland. The creek forms at the confluence of its West and South Branches, offering anglers diverse fishing opportunities ranging from freestone sections to an exceptional tailwater fishery. The West Branch below Lake Marburg stands out as a Class A Wild Trout Stream, having been reclassified from a stocked fishery due to its thriving wild brown trout population. This designation reflects excellent natural reproduction and biomass levels exceeding 257 kg/ha. The creek supports both cold water and warm water fisheries, with different sections managed under various special regulations to protect and enhance trout populations. Running through agricultural countryside and state park lands, the creek provides accessible fishing in a scenic setting while maintaining healthy fish populations through careful management and conservation efforts.