The Mississippi River Boating Survey was conducted as enumeration of boats and face-to-face interviews by the Minnesota Center for Survey Research at the University of Minnesota. It was conducted for the Minnesota Department of Natural Resources. The goal of the survey was to obtain information on the number of boats entering and leaving the river at specific access points and to obtain both trip-specific information and opinions from boaters. The study area included 135 miles of the Mississippi River between the head of navigation in Minneapolis and Lock and Dam 5a at Winona, Minnesota, as well as 25 miles of the St. Croix River and 7 miles of the Minnesota River. Data was to be collected at 250 different locations, spending a full half-day at each location. The sampling design involved stratification by pool, type of access, and type of day. Data collection for the Mississippi River Boating Survey was conducted from 1:30 on July 3 to 10:00 pm on September 2, 1991. While at a given location, data collectors performed two tasks: (1) enumeration, or counting all boats entering and leaving the river from that marina/ramp, and (2) interviewing someone from each boat leaving the river. This interview needed to be conducted with a person knowledgeable about the route for this trip because the mapping was the most difficult portion of the interview. Priority was to be given to enumeration of boats, rather than to interviewing. Consequently, this meant that whenever there was a line of boats waiting to enter or leave the river, only enumeration was done. Tally sheets recording boats entering and leaving the river were completed for 253 full half-day locations. Questions and detailed trip records were completed by 741 boaters leaving the river.