- A. The Upper Potomac River areas, with their corresponding speed limits, are set forth in §§B—J of this regulation.
- B. Fish and Game Club Area. The Fish and Game Club area encompasses the area northeast of a line beginning at a point on shore, at or near Lat. 39°33.104'N., Long. 77°52.965' W., then running 214° (True) to a point, at or near Lat. 39º 33.066' N., Long. 77° 52.998' W., then running 123° (True) to a point, at or near Lat. 39º 32.696' N., Long. 77°52.256' W., then running 45° (True) to a point on shore, at or near Lat. 39°32.728' N., Long. 77° 52.215' W. This area has a 6-knot speed limit all year.
- C. Williamsport Dam. The Williamsport Dam encompasses the area beginning 200 yards above the Potomac Edison Dam at Williamsport, at or near Lat. 39° 35.810' N., Long. 77° 49.705' W., then running 262° (True) to a point, at or near Lat. 39° 35.795' N., Long. 77° 49.850' W., extending upriver to the bridge at U.S. Highway Route 11, at or near Lat. 39° 35.987' N., Long. 77° 49.578' W., then running 274° (True) to a point, at or near Lat. 39° 36.008' N., Long. 77° 49.938' W. This area has a 6-knot speed limit all year.
- D. Dam Number 3. Dam Number 3 encompasses the area starting at Dam Number 3, at or near Lat. 39° 20.225' N., Long. 77° 45.038' W., then running 208° (True) to a point, at or near Lat. 39° 20.127' N., Long. 77° 45.107' W., then running 155° (True) to a point, at or near Lat. 39° 19.957' N., Long. 77° 45.007' W., and extending upriver to a line beginning at a point, at or near Lat. 39° 22.717' N., Long. 77° 45.017' W., then running 247° (True) to a point, at or near Lat. 39° 22.667' N., Long. 77° 45.167' W. This area has a 35-knot speed limit Saturdays, Sundays, and State holidays, all year.
- E. Dam Number 4. Dam Number 4 encompasses the area starting 200 yards upriver of the Dam, at or near Lat. 39° 29.780' N., Long. 77° 49.713' W., then running 192° (True) to a point, at or near Lat. 39° 29.633' N., Long. 77° 49.755' W., and extending upriver to a line beginning at a point, at or near Lat. 39° 33.683' N., Long. 77° 52.550' W., then running 297° (True) to a point, at or near Lat. 39° 33.817' N., Long. 77° 52.883' W. This area has a 35-knot speed limit Saturdays, Sundays, and State holidays, all year.
- F. Dam Number 5. Dam Number 5 encompasses the area starting 200 yards upriver of the Dam, at or near Lat. 39° 36.478' N., Long. 77° 55.425' W., then running 215° (True) to a point, at or near Lat. 39° 36.397' N., Long. 77° 55.498' W., and extending upriver to a line beginning at a point , at or near Lat. 39° 36.510' N., Long. 77° 58.058' W., then running 146° (True) to a point, at or near Lat. 39° 36.438' N., Long. 77° 57.995' W., 100 yards downriver of McCoy's Ferry. This area has a 35-knot speed limit Saturdays, Sundays, and State holidays, all year.
- G. Dargen Bend boat launch area encompasses the area beginning at a point 200 yards upriver of the launch ramp, at or near Lat. 39° 21.925' N., Long. 77° 44.500' W., then running 260° (True) to a point on the opposite side of the river, at or near Lat. 39° 21.907' N., Long. 77° 44.635' W., and extending 100 yards downriver of the launch ramp to a point, at or near Lat. 39° 21.785' N., Long. 77° 44.432' W., then running 261° (True) to a point on the opposite side of the river, at or near Lat. 39° 21.763' N., Long. 77° 44.600' W. This area is designated a minimum wake zone all year.
- H. Big Slackwater boat launch area encompasses the area beginning at a point 200 yards upriver of the launch ramp, at or near Lat. 39° 30.138' N., Long. 77° 50.740' W., then running 249° (True) to a point, at or near Lat. 39° 30.102' N., Long. 77° 50.862' W., and extending 100 yards downriver of the launch ramp to a point, at or near Lat. 39° 29.993' N., Long. 77° 50.693' W., then running 249° (True) to a point, at or near Lat. 39° 29.963' N., Long. 77° 50.792' W. This area is designated a minimum wake zone all year.
- I. Four Locks boat launch area encompasses the area beginning at a point 200 yards upriver of the launch ramp, at or near Lat. 39° 36.803' N., Long. 77° 56.693' W., then running 54° (True) to a point, at or near Lat. 39° 36.853' N., Long. 77° 56.605' W., and extending 100 yards downriver of the launch ramp to a point, at or near Lat. 39° 36.913' N., Long. 77° 56.795' W., then running 54° (True) to a point, at or near Lat. 39° 36.970' N., Long. 77° 56.695' W. This area is designated a minimum wake zone all year.
- J. McCoy's Ferry boat launch area encompasses the area beginning at a point 200 yards upriver of the launch ramp, at or near Lat. 39° 36.412' N., Long. 77° 58.217' W., then running 141° (True) to a point, at or near Lat. 39° 36.360' N., Long. 77° 58.162' W., then running 28° (True) to a point, and extending 100 yards downriver of the launch ramp to a point, at or near Lat. 39° 36.510' N., Long. 77° 58.058' W., then running 146° (True) to a point, at or near Lat. 39° 36.438' N., Long. 77° 57.995' W. This area is designated a minimum wake zone all year.
Authority: Natural Resources Article, §§8-703 and 8-704, Annotated Code of Maryland
Effective date: February 3, 1992 (19:2 Md. R. 153)
Regulation .01 amended effective July 7, 2014 (41:13 Md. R. 751)
Regulation .02 amended effective July 7, 2014 (41:13 Md. R. 751)
Regulation .02A amended effective May 23, 1994 (21:10 Md. R. 843)
Regulation .02B amended effective July 9, 2012 (39:13 Md. R. 785)
Regulation .02D—J adopted effective May 23, 1994 (21:10 Md. R. 843)
Regulation .03 amended effective July 7, 2014 (41:13 Md. R. 751)
Regulation .03F adopted effective September 11, 1995 (22:18 Md. R. 1399)
Regulation .03A amended effective March 22, 2010 (37:6 Md. R. 477)
Regulation .03B amended effective March 13, 2017 (44:5 Md. R. 291)
Regulation .03G, H adopted effective May 1, 2000 (27:8 Md. R. 797)
Regulation .03I adopted effective March 22, 2010 (37:6 Md. R. 477)
Regulation .03I amended effective February 6, 2012 (39:2 Md. R. 140)
Regulation .03J adopted effective July 9, 2012 (39:13 Md. R. 785)
Regulation .04 amended as an emergency provision effective August 25, 1992 (19:18 Md. R. 1652); amended permanently effective February 1, 1993 (20:2 Md. R. 112)
Regulation .04 amended as an emergency provision effective January 6, 1994 (21:2 Md. R. 94); amended permanently effective March 28, 1994 (21:6 Md. R. 466)
Regulation .04 amended as an emergency provision effective November 18, 1994 (21:25 Md. R. 2092); amended permanently effective March 6, 1995 (22:4 Md. R. 236)
Regulation .04 amended effective July 7, 2014 (41:13 Md. R. 751)
Regulation .04A amended effective August 2, 2004 (31:15 Md. R. 1185)
Regulation .04B amended effective March 22, 2010 (37:6 Md. R. 477); May 25, 2015 (42:10 Md. R. 684)
Regulation .05 adopted effective May 24, 1993 (20:10 Md. R. 850)
Regulation .05 amended effective July 7, 2014 (41:13 Md. R. 751)
Regulation .05C adopted effective February 16, 2026 (53:3 Md. R. 121)
Regulation .06 adopted as an emergency provision effective January 31, 2002 (29:4 Md. R. 411); adopted permanently effective April 29, 2002 (29:8 Md. R. 697)
Regulation .06 amended effective July 7, 2014 (41:13 Md. R. 751)
Regulation .07 adopted as an emergency provision effective December 22, 2020 (48:2 Md. R. 46); emergency provision withdrawn (48:7 Md. R. 260)
Regulation .07 adopted effective May 31, 2021 (48:11 Md. R. 428)