Bounded by bridges between Siesta Key and Sarasota, Roberts Bay receives significant water from the large, urbanized Phillippi Creek basin. The adjacent Big Sarasota Pass flushes bay water to the Gulf. Extensive navigable canals and bayous on Siesta Key bring recreational boaters into this small, shallow bay that includes attractive undeveloped islands and mangrove forests. Two small, legal discharges of highly purified wastewater come from Siesta Key and Phillippi Creek. This bay has enjoyed the benefits of inclusion in the Sarasota Bay Estuary Program, is an Outstanding Florida Water, and a SWIM waterbody.
Bay Conditions Reports give a quick assessment of the water quality in a bay during a particular year by examining three important indicators of nutrient pollution: chlorophyll a, nitrogen and phosphorus.
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