WASHINGTON (AP) - The Potomac Conservancy plans to release its State of the Nation's River report along with recommendations for the Potomac, which supplies most of the drinking water for the District of Columbia.

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The Silver Spring, Md.-based environmental group gave the Potomac a grade of D-plus in its first report in 2007 and has not graded the waterway since then. Conservancy spokeswoman Anne Sundermann says the new grade to be released Thursday morning is part of its plan to reassess the waterway every five years.

Last year, the report focused on development, which the conservancy said was a primary source of stress on farms, forests, and water quality.

The conservancy has criticized regulation of chemicals found in rivers that are linked to intersex fish which have both male and female traits. .