Regardless if weirs are a pain or not, the NOAA draft EIS for guiding Columbia Basin hatcheries has weirs included in alternative 3,4 ,and 5 so a possibility exists to install them if one of those alts. are picked.
http://www.nwr.noaa.gov/Salmon-Harvest-Hatcheries/Hatcheries/MA-EIS.cfm

Many along with the tribes aren’t too happy with the DEIS so should be interesting to see what happens.
Columbia River Inter-Tribal Fish Commission member tribes have weighed in at every public meeting, and plan to submit detailed comments and technical analysis by the Dec. 3 deadline. The Nez Perce, Umatilla, Warm Spring and Yakama tribes fish commercially and for ceremonial and subsistence purposes based on long-held treaty rights and other agreements.

“In reviewing the Draft Environmental Impact Statement, the tribes find it disturbing that the analysis of alternatives does not adequately reflect regional collaborative agreements, such as the 2009-2017 U.S. v. Oregon Management Agreement,”
Bruce Jim said during the meeting in Astoria. Jim is chairman of the Fish and Wildlife Committee of the Confederated Tribes of the Warm Springs Reservation of Oregon.