The St. Croix River is a sixth-order steam draining a 20,018 km2 area in east-central Minnesota and northwestern Wisconsin. The 276 km mainstream includes a 1,889 ha natural lake at its mouth and two small reservoirs created by the 3.7 m high Gordon Dam and the 18 m high St. Croix Falls Dam. Historically, the St. Croix River has hosted 110 species of fish representing 24 families. There are 41 mussel species in the basin. In 1968, with the enactment of the National Wild and Scenic Rivers Act, 165 km of the St. Croix River became one of the first eight rivers to become part of the National Wild and Scenic River way system. In 1972, 87 km of the lower St. Croix River were added to the system.

Pictures of different river stages of the St. Croix River

• St. Croix River – normal flow 
  • St. Croix River at 4,000 cubic feet per second (cfs)–“normal” levels
• St. Croix River – flood of 2001
  • St. Croix River at 40,000 cfs
  • St. Croix at 55,000 cfs

Some useful links to information on the St. Croix River

• USGS Discharge Data at Taylors/St. Croix Falls
• USGS Discharge Data at Danbury, WI
• River Stage at Stillwater, MN
• St. Croix National Scenic Riverway – NPS
• St. Croix Watershed Research Station
• Science Museum of Minnesota – St. Croix Research Rendezvous
• St. Croix River Association
• Bridges and Structures of the Saint Croix River