Yes you could look online for Whitehorse Fishway. When you get there don't forget to walk up to the top of the damn, gives you a better idea of how high the fish have to climb and how long the ladder is.

Pop over to the tourist info building on 2nd ave from there cross the Yukon River bridge and continue to walk past the school to the round about turn right the follow the road past Christ the King School on the left and the apartments on the right, continue for about 4 blocks and the fish ladder in a small hut. beyond that is the dam. On your return to the city watch for the foot bridge on the left, take that and follow the lovely foot path along the Yukon river and held back into town. Its a lovely walk and will take you about 1 hour.