Algal blooms in a sewage outflow that joins the Bronx River near Bronxville High School. Algae growth contributes to one of the main impairments to the river's health: low levels of dissolved oxygen, which inhibits the river's ability to provide a proper habitat for aquatic plants and animals.

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The Bronx River passing over bedrock formations beside the River House Apartments in Bronxville, New York.

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Bronxville High School Science teacher Justine McClellan assists students in her Bronx River Research class in taking water quality measurements during class in September of 2019.

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A student in Justine McClellan's Bronx River Research class presents her research after a morning of field work in the Bronx River.

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A sewage outflow in White Plains, New York. Water quality samples completed in Westchester County during the recreational season from May-October, 2018 registered the highest possible values for fecal bacteria, and led to 2018 being the river's worst year for water quality in over a decade.

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A view of the Bronx River at Starlight Park during construction of a bicycle and pedestrian bridge. The bridge is a critical crossing of the river along the Bronx River Greenway, a 25 mile long multi-use path that, when complete, will connect communities along the entirety of the Bronx River's length.

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Bronx residents Maura Mast and Julio Figueroa document litter caught in a boom installed by the Bronx River Alliance at Muskrat Cove, just south of the border separating the Bronx from Westchester County. All litter is hand sorted and accounted for as a part of the Bronx River Alliance's Project WASTE (Waterway And Street Trash Elimination). On this day, 11,235 pieces of trash were collected for a total of 23 bags of garbage. Styrofoam accounted for 85% of the garbage, with plastic garbage adding up to 11% of the waste collected.

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Litter adjacent to the banks of the Bronx River in Concrete Plant Park. Street litter can make its way to riparian areas before ultimately ending up in the Bronx River.

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A Great Egret stands on the river bank near a boom that collects floating refuse and debris at Concrete Plant Park. 

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Katie Lamboy, Environmental Educator and Science Coordinator at Center for the Urban River at Beczak (CURB) uploads water quality data to the web. A native of the Bronx, Katie's duties at CURB include processing the water samples collected for the Bronx River Alliance's citizen science data collection initiative: Project Water Drop. The program tracks multiple indicators of the river's water quality: average dissolved oxygen (DO), PH, and levels of fecal coliform and enterococcus indicator bacteria. This data is crucial in assessing the river's health and locating sewage outfalls illegally discharging waste into the river.

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A school of fish swim downstream of the combined sewage outfall in Starlight Park in the South Bronx.

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Linda Cox, the first Executive Director of the Bronx River Alliance poses for a photograph at the overlook for the dam at E 180th street.

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The West Farms rapids in the Bronx, where modern day reclamation efforts began with the Bronx River Restoration Project in 1974.

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Maggie Greenfield, Executive Director of the Bronx River Alliance and Bronx River Administrator for the City of New York speaks with a journalist from News 12 after the release of 400 Alewife Herring into the river at the Bronx Zoo, April,  2019.

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Diana Fu, Education Field Science Specialist at Billion Oyster Project describes oyster anatomy and the process of measuring oysters to students of The Bronx High School of Science. On this day the students placed three cages of live oysters in the river at Concrete Plant Park as a part of the Oyster Research Station Program, an initiative meant to engage students from the city in hands-on science education.

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Kinney Glass, Program and Operations Assistant with Rocking the Boat instructs students from the Bronx Academy for Multi-Media in sailing at the mouth of the Bronx River. While attending weekly programming at Rocking the Boat, students experience sailing and rowing on the Bronx River, along with environmental education.

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