Glossary

A confluence is the point where two or more streams, creeks, or rivers meet and flow together. This joining of waterways creates a distinct ecological zone where changes in flow, sediment, and nutrient levels often support high biodiversity.

In the San Lorenzo Valley, confluences are found where smaller tributaries like Zayante Creek or Bear Creek merge with the San Lorenzo River. These areas tend to have deeper soils, fluctuating moisture levels, and complex microhabitats that support riparian trees, aquatic insects, amphibians, and birds.

Confluences play a key role in watershed function by slowing water, capturing sediment, and providing refuge during flood and drought cycles. They are often rich in native vegetation, including Red Alder(Alnus rubra), Arroyo Willow(Salix lasiolepis), and Western Sycamore(Platanus racemosa), and serve as corridors for wildlife moving between upland and lowland habitats.

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