Sprague River Oregon Centerline Sycan 1968

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）的流域覆盖俄勒冈州中南部4090平方公里的区域，最终注入威廉姆森河（Williamson River）与上克拉马斯湖（upper Klamath Lake）。在美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service）的合作支持下，美国地质调查局（USGS）与俄勒冈大学（University of Oregon）共同开展了一项研究，针对斯普拉格河及其主要支流共计131公里的河段开展河道与河漫滩过程评估。本次评估的支流包括：斯普拉格河南支（South Fork Sprague River）下游20公里河段、斯普拉格河北支（North Fork Sprague River）下游16公里河段，以及西坎河（Sycan River）下游62公里河段。本研究包含多项分析内容，涵盖历史河道变迁、河岸与河漫滩植被以及表层地质的评估工作。为支撑上述分析，研究团队基于历史记录、地图资料与航空影像制作了数字化河道与河漫滩地图，用以呈现1866年至2005年间不同时期的河道与河漫滩状态。这套收录当前与历史时期河道及河漫滩状况的地理空间数据库，还可用于评估与水生及河岸栖息地状况相关的长期变化趋势。