Some members of the Yakama Nation still fish for salmon using traditional 30-foot-long dip nets at Lyle Falls in the Columbia River Gorge (KUOW, Dec. 16, 2016). To learn more about that history, check out a book coauthored by Prof. Bill Rodgers that chronicles the legal battles around the centuries-old Indian fishery at Celilo Falls, lost when a dam destroyed the waterfall:
The Si'lailo Way: Indians, Salmon and Law on the Columbia River, by Joseph C. Dupris, Kathleen S. Hill &William H. Rodgers Jr. See publisher's page.
For more on fishing controversies in the Northwest, see:
Messages from Frank's Landing: A Story of Salmon, Treaties, and the Indian Way,
by Charles F. Wilkinson (2000)
Where the Salmon Run: The Life and Legacy of Billy Frank Jr.
, by Trova Heffernan (2012)
Empty Nets: Indians, Dams, and the Columbia River, by
Roberta Ulrich (1999)
The nature of borders : salmon, boundaries, and bandits on the Salish Sea, by
Lissa K. Wadewitz (2012)
You can also stream a documentary through UW Libraries subscriptions: River People: Behind the Case of David Sohappy