Volunteer water monitors collect valuable data used by agencies and organizations across the state to protect and manage Minnesota’s waters. Data collected by volunteers can be viewed in a variety of ways.

  • Individual lakes and streams — Local site reports summarize data gathered at each volunteer monitoring location, compare it to other waterbodies in the local watershed, and highlight changes in clarity over time.

A total of 1,367 volunteers collected data during the most recent monitoring season. The number of lake volunteers has decreased slightly over the past few years, with the number of stream monitoring volunteers remaining fairly stable since 2011.

Water clarity data

Water clarity is the primary measurement taken by our volunteers. Water clarity readings for lakes and streams are grouped into ranges, from poor to excellent.

These categories serve as benchmarks for comparing readings across lakes and streams in Minnesota. For the most recent monitoring season, more lakes were in the “Excellent” category than in previous years. The largest percentage of stream sites were in the “Very good” category, similar to previous years. A higher percentage of lakes fall into the “Excellent” category than streams, while more streams were in the “Fair” and “Poor” categories.

Average summer water clarity: Streams

This map shows the distribution of average summer water clarity across Minnesota for stream sites monitored during the most recent monitoring season.

Average summer water clarity: Lakes

This map shows the distribution of average summer water clarity across Minnesota lakes monitored during the most recent monitoring season.