Data provided by US watershed boundaries from USGS - http://water.usgs.gov/GIS/huc.html
Canada watershed boundaries from Ministry on Sustainable Resource Management’s Fisheries Inventory Watershed Atlas - http://srmwww.gov.bc.ca/gis/GISdata.html
Mexico fish distributions from Freshwater Fishes of Mexico (Miller and Minckley 2006)
US fish distributions from each state's respective fish agency
Additional information may come from peer-reviewed literature, grey literature and agency reports, and scientific collection permit catch records
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Captions
Map of Sacramento sucker (Catostomus occidentalis) distribution for current occupation within historical range