Sprague River Oregon Centerline North Fork 2000

The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S. Fish and Wildlife Service, the USGS and University of Oregon conducted a study to evaluate channel and floodplain processes for the 131 km of the Sprague River and its major tributaries, including the lower 20 km of the South Fork Sprague River, the lower 16 km of the North Fork Sprague River, and the lower 62 km of the Sycan River. The study involved multiple analyses, including assessments of historical channel change, riparian and floodplain vegetation, and surficial geology. To support these analyses, digital floodplain and channel maps were prepared from historic notes, maps, and aerial photos to depict channel and floodplain conditions at different times between 1866 and 2005. The geospatial database of current and historic channel and floodplain conditions will also enable evaluation of long-term trends pertaining to aquatic and riparian habitat conditions.

斯普拉格河（Sprague River）流经俄勒冈州中南部，流域面积达4090平方千米，最终注入威廉姆森河（Williamson River）与上克拉马斯湖（upper Klamath Lake）。本研究由美国地质调查局（USGS）与俄勒冈大学（University of Oregon）联合美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service）开展，针对全长131千米的斯普拉格河及其主要支流展开河道与河漫滩过程评估，研究范围涵盖斯普拉格河南支流下游20千米、斯普拉格河北支流下游16千米以及赛坎河（Sycan River）下游62千米。本次研究包含多项分析内容，包括历史河道变化评估、河岸带与河漫滩植被调查以及表层地质勘探。为支撑上述分析工作，研究团队基于历史记录、历史地图与航空影像绘制了数字化河漫滩与河道地图，以呈现1866年至2005年间不同时期的河道与河漫滩状态。这套涵盖当前与历史河道及河漫滩状态的地理空间数据库，还可用于评估与水生及河岸栖息地相关的长期变化趋势。