On Shields fish in 6-12 feet of water outside of the weeds on sand/rock breaks from shoreline of the main lake that have deeper water near…the better the break the more likely you’ll find walleyes from the base of the break on up to the flats. The larger walleyes I’ve caught at this time of year have been on deeper flats…12-20 foot of water and mostly on spinners w/bait and deep running crankbaits. Fatheads, Shiners, crawlers seem best on Shields…and you can go through a couple dozen shiners pretty quick. Expect to catch a lot of 12 inchers, but otherwise the bigger ‘eyes are gonna run 3-6 pounds…there fewer and farther between unfortnately. Evening is generally best. The weeds will be choking you out in the next couple weeks and then in the fall those same areas will be good again as the weeds begin to die back.
On Mazaska crawlers and fatheads or even crappie minnows work well. Pitch light jigs to deep weedlines and up into the weeds that border deep water. Most of the ‘eyes on Mazaska have been running around 3-4 pounds…it’s a tougher lake for walleyes until you get a good feel for it. Crappies hang out on the same weedlines so you’ll likely catch both in some areas.
Don’t get discouraged on these 2 lakes it takes time to figure them out and recent and daily fronts make fishing tough.
Also check the MN DNR website under lake finder as it gives you a printable map, lake surveys (sometimes outdated), and forage information. It can get you started.