The St. Croix - Namekagon river system provides one of the most extensive and exemplary aquatic species assemblages within the Upper Mississippi River basin and contains healthy naturally reproducing populations of 100 native fish species. The river system also transitions from a cold water river to a warm water river, and small headwater streams to large rivers, with fish communities providing a textbook example of how assemblages change from place to place.
Ample spawning and rearing areas connect abundant adult habitat for 19 state-listed fish species, including lake sturgeon, crystal darters, and golden redhorse. The rivers contain outstanding invertebrate communities (think fish food) and are home to populations of undescribed species of gilt darter.
The rivers provide world class fishing for smallmouth bass, and trophy-sized sport fish including walleye, sauger, muskellunge, and channel catfish. Species of redhorse are found in larger numbers and sizes than in other river systems in Minnesota and Wisconsin.
Visit the NPSpecies database for a species list. Select the species in question using the 'Category' drop-down box and enter 'Search'.
Species Attribute Definitions
Occurrence values are defined below. One or more Occurrence Tags may be associated with each Occurrence value.
Present: Species occurs in park; current, reliable evidence available.
Probably Present: High confidence species occurs in park but current, verified evidence needed.
Unconfirmed: Species is attributed to park but evidence is weak or absent.
Not In Park: Species is not known to occur in park.
Adjacent: Species is known to occur in areas near to or contiguous with park boundaries.
False Report: Species was reported to occur within the park, but current evidence indicates the report was based on misidentification, a taxonomic concept no longer accepted, or other similar problem of error or interpretation.
Historical: Species' historical occurrence in park is documented. Assigned based on judgment as opposed to determination based on age of the most recent evidence.
Animals: May be seen daily, in suitable habitat and season, and counted in relatively large numbers.
Plants: Large number of individuals; wide ecological amplitude or occurring in habitats covering a large portion of the park.
Animals: May be seen daily, in suitable habitat and season, but not in large numbers.
Plants: Large numbers of individuals predictably occurring in commonly encountered habitats but not those covering a large portion of the park.
Animals: Likely to be seen monthly in appropriate habitat and season. May be locally common.
Plants: Few to moderate numbers of individuals; occurring either sporadically in commonly encountered habitats or in uncommon habitats.
Animals: Present, but usually seen only a few times each year.
Plants: Few individuals, usually restricted to small areas of rare habitat.
Animals: Occurs in the park at least once every few years, varying in numbers, but not necessarily every year.
Plants: Abundance variable from year to year (e.g., desert plants).
Unknown: Abundance unknown
Native: Species naturally occurs in park or region.
Non-native: Species occurs on park lands as a result of deliberate or accidental human activities.
Unknown: Nativeness status is unknown or ambiguous.
The Checklist contains only those species that are designated as "present" or "probably present" in the park.
The Full List includes all the checklist species in addition to species that are unconfirmed, historically detected, or incorrectly reported as being found in the park. The full list also contains species that are "in review" because their status in the park hasn't been fully determined. Additional details about the status of each species is included in the full list.
The checklist will almost always contain fewer species than the full list.