USGS Washington Water Science Center
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WA211 - Water Resources of the Shoalwater Indian Reservation - Completed FY1983
Problem - The Shoalwater Reservation comprises about 350 acres. An additional 1,100 acres of wetland adjacent to the reservation are being considered for purchase and addition to the reservation. The Tribe plans to develop a salmon and shellfish hatchery. Tribal officials believe the water resources of the reservation should be documented to permit their development. They also are concerned about preservation of this resource; areas to the southeast and northwest of the reservation are well-developed agricultural and resort areas that impose moderately large stresses on the water resources both from the standpoint of use and pollution.
Objectives - The objectives of this study are to define the water resources of the reservation, including: (1) availability of GW for domestic use and fish culture, (2) effects of off-reservation ground-water development on the ground water within the reservation, (3) discharge and water quality of the 2 streams draining the reservation, and (4) the water quality (pesticides and herbicides) in Pacific County Drainage Ditch #1, as it effects shellfish on tribal tidelands.
Approach - Data on all existing wells on and near the reservation will be interpreted to assess GW availability. A GW network will be established to determine seasonal variations in water levels and the effects of pumping. Wells will be tested for yield and drawdown to determine aquifer characteristics. Several wells will be sampled for general chemical quality and the deeper wells near the beach will be sampled to evaluate the possibility of seawater intrusion. Staff gages will be installed on an eastern stream where it discharges onto tidelands. Temperature and bacteriological samples will be collected periodically at these sites. A staff gage will also be installed at Pacific County Drainage Ditch #1. Samples will be collected at this site also (herbicides and pesticides).