Open Water Data

UPR-5 Big Slackwater Boat Ramp

Williamsport, Maryland, United States

Data Sources
  • Water Quality Status
    Passed tests Thu, Sep 18, 2025 at 2:07pm
  • Air Temperature
    4.4°C / 39.9°F (air) Fri, Oct 10, 2025 at 8:45am
  • Wind
    3.6 - 10.8km/h N 356° Fri, Oct 10, 2025 at 8:45am
  • Overcast
    Overcast Fri, Oct 10, 2025 at 8:45am
  • Precipitation
    0mm Fri, Oct 10, 2025 at 8:45am
  • Air Visibility
    16km Fri, Oct 10, 2025 at 8:45am
  • Humidity
    89% Fri, Oct 10, 2025 at 8:45am

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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