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Pearl River, NY. Online Offers. Pearl River is a hamlet (and census-designated place), in the Town of Orangetown Rockland County, New York, United States located east of Nauraushaun; north of the state of New Jersey; south of Nanuet and west of Blauvelt. The population was 15,553 at the 2000 census.
Columbia River Mile (RM) 308 ... Wallula Gap ... Many features along the Columbia River were impacted or created by the Missoula Floods. The Wallula Gap near the eastern end of the Columbia River restricted flood waters creating a temporary Lake Lewis. Lake Lewis stretched back into the Yakima River Valley and covered the today's cities of Richland, Pasco, and Kennewick.