One year after retiring from Hsichou High in 2000, Wu became a writer in residence for the Nantou County Government. With his wife, Chuang Fang-hua, he traced the Choshui River from its source. They started from Wuling between Mt.
2000 年吳晟自溪州國中退休後，隔年擔任南投縣駐縣作家，偕同妻子莊芳華，從濁水溪源頭──奇萊山北峰與合歡山東峰間的佐久間鞍部開始展讀；沿著萬大、曲冰、萬豐、武界等原住民部落，觀察濁水溪主流的流向。