Over the past few decades, populations of Kootenai River white sturgeon (Acipenser transmontanus) have been declining. It is postulated that changes in the natural streamflow regime of the Kootenai River, resulting from the operation of Libby Dam in Montana, have had an .adverse effect on sturgeon spawning habitat. Decreased streamflows and, hence, decreased stream velocities and discharges during the spring spawning period are viewed as being partly responsible for these declines. The Idaho Department of Fish and Game requested that the U.S. Geological Survey aid in the investigation of the declining sturgeon populations by collecting and summarizing velocity data for three reaches of the Kootenai River in the vicinity of Bonners Ferry, Idaho. These data were collected during June 10-12,1997, at a river discharge ranging from 1,240 to 1,260 cubic meters per second. These dates coincide with the typical peak of the sturgeon's spawning activities. The data were collected using a broadband Acoustic Doppler Current Profiler in conjunction with a Global Positioning System and total station for georeferencing. Velocity data subsequently were post-processed and contoured using a surface-modeling software package. Horizontally and vertically distributed velocitycontour plots were generated using a triangulationwith-linear-interpolation method employed by the software.
The upper reaches of the Susltna River have been considered for development of a large power-generation system for southcentral Alaska. This report presents a summary and discussion of sediment and hydraulic data obtained from October 1984 to September 1985 (water year 1985) at selected sites on the Susitna, Chulitna, Talkeetna and Yentna Rivers. Sediment data include measurements of suspendedsediment and bedload discharge, and analyses of particle-size distribution of suspended sediment, bedload, and bed material; hydraulic data include measurements of channel width, average depth and velocity of water, and water-surface slope. Relations between water and sediment discharge are developed for each site.
Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.