The four–team Independent level league consisted of teams based in Oregon and Washington.
The four host cities first formed together as the Pacific Interstate League of 1891.
The La Grande Grand Rhonders won the championship with a 20–10 record, finishing 2.0 games ahead of the next team in the final standings.
Ending the season schedule on September 14, 1891, the league did not return to play in 1892 and permanently folded.
The Baker City Gold Diggers, La Grande Beetpullers, Pendleton Indians and Walla Walla Sharpshooters were the 1902 members.