Open Water Data

UPR-5 Big Slackwater Boat Ramp

Williamsport, Maryland, United States

Data Sources
  • Water Quality Status
    Passed tests Thu, Aug 21, 2025 at 1:29pm
  • Air Temperature
    18.3°C / 64.9°F (air) Fri, Aug 22, 2025 at 7:00am
  • Wind
    3.6 - 10.8km/h NW 326° Fri, Aug 22, 2025 at 7:00am
  • Mist
    Mist Fri, Aug 22, 2025 at 7:00am
  • Precipitation
    0mm Fri, Aug 22, 2025 at 7:00am
  • Air Visibility
    16km Fri, Aug 22, 2025 at 7:00am
  • Humidity
    93% Fri, Aug 22, 2025 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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