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
    13.9°C / 57°F (air) Sat, Apr 4, 2026 at 7:00am
  • Wind
    5 - 10.6km/h SW 230° Sat, Apr 4, 2026 at 7:00am
  • Sunny
    Sunny Sat, Apr 4, 2026 at 7:00am
  • Precipitation
    0mm Sat, Apr 4, 2026 at 7:00am
  • Air Visibility
    13km Sat, Apr 4, 2026 at 7:00am
  • Humidity
    93% Sat, Apr 4, 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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