This year marks 200 years since Joseph C. Brown, Prospect Robbins and their surveying teams located the initial point for the land survey of the history-making Louisiana Purchase.

To commemorate the setting of the initial point of the 5th Principal Meridian and its baseline, the Arkansas Society of Professional Surveyors is working in conjunction with the Arkansas Department of State Parks and others to coordinate a celebration. It will take place Oct. 17 from 9 a.m. to 5 p.m.

Attendees will learn how Brown and Robbins completed the historic surveying project in 1815 through recreations of villages from the time period, reenactments of the survey and more. Four venues — the Mississippi River State Park, Louisiana Purchase State Park, Mississippi River State Park Base Line Trail, and Confluence of the St. Francis and Mississippi Rivers — are scheduled to participate in the memorial. Modern surveyors and equipment will be present at each location to answer questions.

The first 200 visitors to have their field note card signed by the Arkansas Society of Professional Surveyor representative at all four destinations will be awarded a free commemorative patch. For more information, call 870-295-4040 or email Mississippiriver@arkansas.gov.