I lived in Grand Rapids for the past few years, fished a ton of lakes around there, never Bowstring though. From what I gathered everyone fished the lake years back; I think in got overworked a bit. People don’t fish it like they did in its’ hay day now, so hopefully it can get back to being a solid walleye producing lake. You can still go out there and catch fish, but I think its safe to say the numbers are way down.