During the WHP-P17N re-visit cruise in 2001 summer in the eastern North Pacific (30–55°N), we carried out hydrographic observations and collected more than 700 seawater samples for AMS radiocarbon measurement. Comparison of hydrographic data, including radiocarbon, between the first visit in the early 1990s and the re-visit elucidated temporal change of surface and intermediate waters during the past decade in the eastern North Pacific. In the intermediate water (≈200–600 m depth) concentration of dissolved oxygen decreased with increase of nutrients concentration. Intermediate radiocarbon decreased slightly or did not change. These results are consistent with decrease trend of intermediate oxygen in the whole North Pacific Ocean in the past decades and suggest recent stagnation of the intermediate water formation in the eastern North Pacific.