U.S. Fish & Wildlife ServiceDate: December 2022 Summary: The Pacific lamprey has inhabited the rivers, streams and coastal waters of the west for 350 million years (BPA, 2005). These data describe areas of known distribution (this dataset is limited to Oregon, Washington and Idaho) currently and historically used by Pacific Lamprey. Pacific Lamprey, Entosphenus tridentata are native to the Pacific coast from Baja California to the Bering Sea. They are anadromous, migrating from their natal stream to the ocean and back, but unlike salmon, Pacific Lamprey spend well over half of their total life cycle in freshwater. Distribution data is mapped at a 1:24,000 scale and are based on the StreamNet Hydrography dataset. Type: ArcGIS Feature Layer View for most up to date observation and distribution data Reason: Public outreach Scale: Web Source: Columbia River Fish and Wildlife Conservation Office curated the data from multiple sources (see metadata).ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/d475e68fd6c34f79b56add3fd80678a5_1engU.S. Fish and Wildlife Service Open DataPublicDistribution 20220421 MasterArchive [United States]Web servicesUnited StatesLast Modified: 2025-03-14