Surface Water Online Data
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Surface Water Online Data
Welcome to the Snohomish County Surface Water Management (SWM) online data application. The following types of data are available:
Hydrology: data collected every 15 minutes to 2 hours from sites around the County
  • Stream level
  • Flow
  • Precipitation
  • Temperature
Water Quality: data from streams and rivers around the County
  • Water quality samples - monthly
  • Benthic invertebrate samples - annually
Contact Steve Britsch
Lake Quality: data (mainly May-October) from lakes around the county
  • Water quality samples
  • Lake observations
  • Lake profile data
Contact Marisa Burghdoff
Please select a section above for a list of available sites and data, or use the Geographic Search to select a site on the map.