Patapsco River Lower North Branch
The Patapsco River Basin is entirely in the State of Maryland. The River drains to the Baltimore Harbor area, then to the Chesapeake Bay and eventually to the Atlantic Ocean. One subwatershed within the Patapsco River Basin is known as the Lower North Branch (LNB). It encompasses 118 square miles in Baltimore City and four Counties: Anne Arundel, Baltimore, Carroll and Howard. About 38 square miles of the Patapsco LNB watershed is in Howard County. Howard
County is receiving Federal grant funding to prepare a Watershed Restoration Action Strategy
(WRAS) for their portion of the Patapsco LNB Watershed.
As part of the WRAS project, the Maryland Department of Natural Resources (DNR) is providing
technical assistance, including preparation of a watershed characterization (compilation of
available water quality and natural resources information and identification of issues), a stream
corridor assessment (uses field data to catalog issues and rate severity) and a synoptic survey
(analyzes benthic macroinvertebrates, fish and water samples with focus on nutrients). The
County will consider the information generated in these efforts as it drafts the County Watershed
Restoration Action Strategy.
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Updated on March 8, 2005