So, five trips out, no fish. Fuel, snacks, lost/worn gear not to mention time wasted, a modest cost estimate at $10 a trip is reasonable, I think. Call it $50. May I suggest, before you fish again and throw more good money after bad, consider taking a course from one of the local tackle shops, and learn how & where to fish for salmon properly. No disrespect intended.
I am an urban fisherman too, without anyone to show me the ropes, so I fished with moderate to poor success with the fishing skillset I brought with me as a kid growing up on the praries. This year I spent $50 to take a 3 hour salmon / river fishing course at my fave tackle shop and walked away very confident in terms of knowing when, where and how to catch salmon and steelhead. I already knew a lot, but not nearly enough. And I must admit being able to ask all my stupid questions to someone who was actually willing to share their fishing secrets with me just really gave me a lot confidence. It is said that 90% of the fish are caught by 10% of the fisherman, and I believe it. Now that I know how the 10% gear up, where they go and what waters to look for.... all I need is the time to go fishing! Lol!
Good luck!