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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

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Portland Area Watershed Monitoring and Assessment Program (PAWMAP)

The Portland Area Watershed Monitoring and Assessment Program (PAWMAP) is a coordinated long-term monitoring effort designed to measure the city’s current and changing ecological resources. The program systematically measures changes in habitat, water quality and biological communities over time.

PAWMAP samples the following components along perennial and intermittent streams across Portland:

  • In-stream and riparian habitat
  • Water quality including temperature, oxygen, pathogens, and metals
  • Macroinvertebrates
  • Fish
  • Riparian birds

PAWMAP Study Design

PAWMAP’s methods and protocol are based on a national monitoring program called EMAP (Environmental Monitoring and Assessment). The National Aquatic Resource Surveys uses the same protocol to routinely monitor the nation’s aquatic resources.

PAWMAP panel rotationEnvironmental Services selects monitoring sites using probabilistic survey design. Each year, PAWMAP staff sample a rotating panel of 20 perennial and 12 intermittent stations. In years one through four, staff samples different stations each year. In years five through eight and thereafter, staff re-samples the initial four panels of stations every four years.
Data collected at individual sites is generalized to be representative of the entire watershed.
This comprehensive citywide monitoring approach saves money by consolidating monitoring efforts, finds the source of environmental issues, and helps the city meet regulations that protect our rivers and streams.
PAWMAP has not incorporated monitoring in the Columbia and Willamette rivers at this time. Environmental Services is developing an approach for incorporating large river monitoring into PAWMAP.

View a program fact sheet.

View annual PAWMAP reports

Contact Us

To contact the Science, Fish and Wildlife Division, email Ronda Fast or call 503-823-4921.