USGS Washington Water Science Center
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Covering about 28 square miles along the lower reaches of the Puyallup River in Pierce County, the Puyallup Indian Reservation is located in the lowest part of the basin. For this reason, all water-related activities in the basin affect the Puyallup Tribe of Indians' water resources and fish.
Because of their important links to the Puyallup River, the Puyallup Tribe of Indians want to know more about the river basin and its streamflow: trends in streamflow, comparisons to minimum instream flows, and water use in the basin.
To help the Puyallup Tribe of Indians determine the answers to their streamflow questions, the USGS is studying patterns of streamflow in the lower Puyallup River to see if they have changed significantly over the last 20 years. Also being studied are the potential effects of water use in the basin on streamflow, how streamflow varies with changes in the climate, and the fraction of time that the river has not met minimum instream flows over the last 20 years.