Big Sioux River access points and trip distances, Iowa
14 access points (14 public) along 121.2 river miles of the Big Sioux River in Iowa. Distances are measured along the river on the NHDPlus V2 main-stem flowline, not straight-line. River mile 0 is the farthest-upstream access listed here.
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Time estimates use the speed above; 2 mph is a typical relaxed recreational pace with light current. Set your own.
Map
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Dark dots are public access points; brown dots are private, members-only or agency-land access. Tap a dot for its river mile and coordinates.
Sources: river line and lengths from NHDPlus V2 via EPA WATERS (lengths scaled to each reach's published length); access points from Iowa DNR Boat Ramps, OpenStreetMap contributors (ODbL). Only access points in our launch data are shown, so there may be others. Check access, dams and conditions before you go.