There is one primary stream within the subwatershed: Classen Creek, which flows to Stubbs Bay. Several other small streams and channels provide drainage and local conveyance within the subwatershed. Classen Creek is included in the District’s Annual Hydrologic Data monitoring program, and was also studied in-depth in 2004 as part of the District’s Upper Watershed Stream Assessment. The Assessment identified only one storm sewer outfall. There are eight culvert crossings, and one impoundment known locally as “Swan Lake,” created when the property around the impoundment was developed.
The creek flows mainly through forested areas prior to discharging to Stubbs Bay. The Stream Assessment identified fifteen erosion sites and five sites with debris in the channel significant enough to obstruct the channel. The erosion was mainly localized streambank sloughing and bank failure and was often associated with woody debris.
Water quality and flow in the creek is monitored at one location. Classen Creek carries a significant phosphorus and sediment load to Lake Minnetonka at Stubbs Bay. Dissolved oxygen within the stream in the summer months in 2004 did not fall below the 5 mg/L State of Minnesota standard for class 2B waters.