Special bass regulations have turned Lake Marburg, in southern York County, into one of south-central Pennsylvania's better largemouth lakes. Bass in the three- to four-pound range are now frequently taken, and largemouths topping the six-pound mark have also been documented, thanks to the two-fish-per-day, 15-inch-minimum rule. In late summer focus on weed-choked flats in the two-mile-long arm that extends off the southern boundary of the lake. Work soft-plastics such as Slug-Gos or four-inch tube baits along the edge of the vegetation in the twilight hours. Or fish live shiners or large bucktail jigs just off deepwater structure near the dam at the eastern end of the impoundment. Contact: Codorus State Park (1066 Blooming Grove Road, Hanover, PA 17331; 717-637-2816).