It's been tried someone unsuccessfully.
https://www.mapleridgenews.com/news/sockeye-not-spawning-in-alouette-river/
"Currently, the sockeye, usually about 100 or so, that return to spawn are trapped at the base of the dam, then carried by truck across the dam and released into the lake."
http://www.alouetteriver.org/current-sockeye-update.html
"During the week of August 13, 2007, sockeye were found in the holding pens at the Allco Fish Hatchery. Approximately 18 mortalities of sockeye were found later that day by BC Hydro employees at the base of the dam, the sockeye having tried unsuccessfully to reach the reservoir through the low level outlet flow. It is thought that the sockeye were simply jumping over the Allco Fish fence, intent on making their way home. BC Hydro has made a temporary shield over the low level outlet pipe in order to avoid any further mortalities and the fish fence has been modified at Allco to deter any sockeye from jumping over the fence."
https://www.bchydro.com/content/dam...ng/lower-mainland/alumon-4-yr7-2015-07-01.pdf
"Recommendations
Continue monitoring Alouette Sockeye adult returns to determine total returns to the reservoir.
To ensure the beginning of the Sockeye run is captured, begin operation of the Allco fish fence from the middle of June and operate until late October.
Continue the practice of releasing captured Sockeye to the reservoir on the same day and handle as little as possible.
Ensure future scale samples are obtained from the correct location above the lateral line on the fish body, correctly placed in the sample vials, and not taken near scars.
Continue with the biosampling protocol of fork length, scale, and tissue samples taken for all returning Sockeye
. Ensure the Allco hatchery trap remains otter-proofed to decrease losses due to predation in the trap itself.
Due to some predator loss, an assessment of returning Sockeye downstream of the Allco fish fence should be implemented.
Conduct the recommended hatchery-based experiment discussed above (see the Management Questions section) to help to answer the outstanding management question of whether Alouette Lake Kokanee smolts have successfully adapted to an anadromous existence by returning from the ocean environment to successfully spawn in Alouette Lake.