Open Water Data

UPR-5 Big Slackwater Boat Ramp

Williamsport, Maryland, United States

Data Sources
  • Water Quality Status
    Passed tests Thu, Jun 5, 2025 at 3:29pm
  • Air Temperature
    21.1°C / 70°F (air) Wed, Jun 18, 2025
  • Wind
    7.6 - 15.9km/h SW 219° Wed, Jun 18, 2025
  • Partly cloudy
    Partly cloudy Wed, Jun 18, 2025
  • Precipitation
    0mm Wed, Jun 18, 2025
  • Air Visibility
    16km Wed, Jun 18, 2025
  • Humidity
    97% Wed, Jun 18, 2025

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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