Open Water Data

UPR-5 Big Slackwater Boat Ramp

Williamsport, Maryland, United States

Data Sources
  • Water Quality Status
    Passed tests Thu, May 14, 2026 at 4:20pm
  • Air Temperature
    12.8°C / 55°F (air) Fri, May 22, 2026 at 7:00am
  • Wind
    5 - 7.2km/h NE 42° Fri, May 22, 2026 at 7:00am
  • Light rain
    Light rain Fri, May 22, 2026 at 7:00am
  • Precipitation
    0mm Fri, May 22, 2026 at 7:00am
  • Air Visibility
    9.7km Fri, May 22, 2026 at 7:00am
  • Humidity
    96% Fri, May 22, 2026 at 7:00am

This site is located at the C&O Canal Big Slackwater access off of Dam No. 4 rd. This is the most popular boat ramp in the Upper Potomac River because of the access to the deep water section called Big Slackwater created by Dam No. 4.

The description above was copied from or heavily based on Swim Guide, with permission.

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