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Crab Creek groundwater study

We've collected baseline data for local groundwater conditions in Crab Creek as part of the Crab Creek Alternate Water Supply Route Study, which proposes to introduce additional irrigation water to the Potholes Reservoir in Grant County. Once the additional irrigation water is released, monitoring will continue to assess the impact the supply water has on local groundwater aquifers.

Assessing impact on local groundwater

Slow-moving wide creek with a rocky shore and a roadway bridge across it.

The U.S. Bureau of Reclamation proposes to deliver additional irrigation water to the Potholes Reservoir in Grant County, as part of the Columbia Basin Irrigation Project they manage. The proposed route for this supply water is from Billy Clapp Lake through the existing Crab Creek channel and through Moses Lake.

One purpose of this study is to collect baseline data on local groundwater prior to the introduction of the supply water. This will help us assess impacts to the water table when new water is added to the system to make irrigation water sources more reliable at the south end of the project.

Monitoring will resume, once Reclamation releases the water as part of the overall project study by the Office of Columbia River. Then we will assess the impact of the supply water on local groundwater. Multiple parameters are being analyzed from a network of seven wells along Crab Creek and Rocky Ford Creek. Parameters include water level, temperature, dissolved oxygen, pH, conductivity, nitrogen, phosphorus, chlorides, sulfates, alkalinity carbonate/bicarbonate, and cations.

Environmental Information Management database Study ID: jros0011

Publications

Quality Assurance Project Plan: Crab Creek Alternate Water Supply Route Study: Water Quality Monitoring describes the study design.