Continuing Hike with Jon Wolz: Big Slackwater

Sun Nov 15, 2026 11:00 AM - 2:30 PM
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Join Jon Wolz on Sunday November 11 at the Big Slackwater Parking Lot at mile 85.40 along the C&O Canal National Historical Park. We will walk down to mile marker 83.30 to the Dam 4 Cave. Along the way, we will pass Dam 4 and the winch house. Total round trip will be 4.2 miles and should take up to three hours to complete. Pack lunch and water. Please dress for the weather.

Directions to the Big Slackwater Boat Ramp parking lot: From Hagerstown, take I-70 Exit 28, MD-632 South to Downsville Pike. Continue about 5.0 miles to the intersection of MD-63. Cross MD-63 and Downsville Pike becomes Dam No. 4 Rd. Continue approximately 4.4 miles to Dam 4 parking area (Do not stop here). Continue to follow the access road 1.0 mile to a large parking area. You arrived!


Upon his retirement from NASA in 2014 Jon Wolz became a prominent local historian, author, and dedicated volunteer in Poolesville, Maryland, widely recognized for his deep expertise on the C&O Canal National Historical Park. His involvement with the canal stretches back to his youth, notably testifying before a Senate subcommittee as an Eagle Scout in December 1970 to help secure its national historical park designation. He has authored over 100 historical articles for the Monocacy Monocle newspaper and has written articles for the publication Along The Towpath. He serves as the Poolesville representative for the Canal Towns Partnership. He is the President, Sons of the American Revolution, General William Smallwood Chapter in Montgomery County. He frequently partners with the Poolesville Seniors and the C&O Canal Association to lead educational history hikes, river crossings, and informational panels. Contact information for Jon Wolz is 240-888-5367