Figure 19. Decadal response of water levels in Mosier, Oregon, study area wells to precipitation‑driven recharge (precipitation measured at nearby Hood River, Oregon). Water levels in a shallow basalt well (454031121215701) show a definite response to wet and dry periods, but most Oregon Water Resources Department administrative area wells (typified by the proximal well 454031121224001) are deeper, showing a lagged, attenuated response. Data for both wells have been de-trended by removing a linear 3.9-foot-per-year decline, and by using water levels representative of late winter to remove seasonal variation.

First posted March 1, 2012