pˌiːˌɛfsˈiː ɛmplˈɔɪiːz pɹəɡɹˈɛst ˌʌp ðə kəlˈʌmbiə ɹˈɪvɚɹ ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd ɪlˈɛvən ɐkˈʌmpənid baɪ ɐ ˌɛndˌʌbəljˌuːsˈiː pˈɑːɹɾi lˈɛd baɪ dˈeɪvɪd tˈɑːmpsən æz fˈɑːɹ æz ðə ɹˈæpɪdz æt sɛlˈɪloʊ fˈɔːlz.
PFC employees progressed up the Columbia River in 1811 accompanied by a NWC party led by David Thompson as far as the rapids at Celilo Falls.