Abstract:
Scientists at the Columbia River Research Laboratory and the Upper Midwest Environmental Sciences Center are developing geographic information system (GIS) based tools to assist managers with making decisions regarding the natural resources in and around the John Day Reservoir (see map). The reservoir, also known as Lake Umatilla, was created in 1968 when the U.S. Army Corps of Engineers
... constructed the John Day Dam on the Columbia River. The reservoir is 76 miles long and is bounded by John Day Dam on the western downstream end and McNary Dam on the eastern upstream end. Power generation, irrigation, navigation, angling, and windsurfing are some of society's uses of John Day Reservoir. The reservoir hosts many species of fish and wildlife, including several species of threatened or endangered salmon, and is important to migratory birds that visit or nest at the Umatilla National Wildlife Refuge and other nearby wildlife areas.
[Summary provided by the USGS.] 
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