Juvenile Monitoring

salmon and steelhead snorkel countS 

Sonoma Water biologists conduct snorkel surveys each summer in order to document the presence, distribution and minimum count of young-of-year (yoy) salmon and steelhead. These fish were spawned and hatched the previous winter or spring. Snorkel surveys are conducted in every second pool and expanded counts are generated by doubling the observed count. 

See the Summer Monitoring reports on our Reports & Publications page for a detailed overview of snorkel survey methods and outcomes for each year. *Tip: Table 1 shows how many fish we saw in each stream.