I fish 30’-40’ wide upper reaches of PNW Coastal Rivers for Sea Run (Coastal) Cutthroat. But IMHO salmon are pretty ugly by the time they get there and deserve to spawn unmolested. The Cutts are there to gorge on eggs and possibly flesh. They make for good sport.
I can “two hand” cast a weighted fly about 25 ft with a level line the length of my 5.3 m Keiryu rod. A fixed line hasn’t worked well for me from salt beaches where Chum, Jack Chinook, Rezzie Coho, and Cutt hookups generally occur beyond 30’. Carrying a longer line in the air than my 5 meter rod in PNW coastal rivers invites catching a lot of trees, and hasn’t worked very well for me and my skills. My thoughts on longer lines are in this “tapered line” thread.