What is bioassessment?

Bioassessment monitoring is a tool used state-wide to assess the health of our rivers and streams. The effort involves collecting macroinvertebrate samples from our local creeks and taking measurements of the habitat. To join our spring monitoring effort, volunteers must first attend a three-hour training session, to be held on Saturday, April 13th from 9 a.m. to noon. Upon completing the training, volunteers will assist the Estuary Program with the monitoring effort. Each trip takes approximately four hours, and the work is expected to take place in April to May, depending on rainfall. Surveys will take place on weekdays as well as weekends. You must be able to stay for the duration of the survey.

We thank the Harold J. Miossi Charitable Trust for their generous support of this bioassessment survey effort over the years.

Volunteer for bioassessment 2020

Training for our 2019 bioassessment volunteers took place in mid-April. If you would like to volunteer for bioassessment in spring of 2020, please fill out our volunteer interest form and indicate your interest in this annual volunteer opportunity. This will add you to our bioassessement survey interest list, and an Estuary Program staff member will reach out to you with more information in spring of 2020.

If you would like to volunteer before then, please take a look at all of the volunteer opportunities available with the Estuary Program and our partners at

Thank you, volunteers!

Morro Bay National Estuary Program brings together citizens, local governments, non-profits, agencies, and landowners to protect and restore the Morro Bay estuary.

Protecting and Restoring the Morro Bay Estuary.