https://ridewithgps.com/routes/20368575
https://www.youtube.com/watch?v=24qZrYghGXI
https://www.trails.com/tcatalog_trail.aspx?trailid=CGW008-091
http://www.water.weather.gov/ahps2/hydrograph.php?wfo=pqr&gage=phio3
https://en.wikipedia.org/wiki/Marys_River_(Oregon)
National Weather Service hydrograph
Bureau of Land Management: Marys River
https://www.mrwc.org/
http://www.riverfacts.com/rivers/12675.html