If you can figure out the boundaries from county code it appears you can shoot in Sultan Basin, just not along the road.
10.12.010 No shooting areas established.
(53) Those portions of state-owned lands in Sections 9, 10, 11, 14, 15, 16, Township 28 North, Range 8 East, W.M., situated in Snohomish county described as follows: Those lands 100 yards in width on either side of Sultan Basin road beginning at the south line of the southeast quarter of the southeast quarter of section 16 crossing the southeast quarter of the southeast quarter, the northeast quarter of the southeast quarter of section 16; the south half of the southeast quarter, the northeast quarter of the southeast quarter of section 9; the northwest quarter of the southwest quarter, the south half of the south half of section 10; the northeast quarter of the northwest quarter, the north half of the northeast quarter of section 15; the north half of the northwest quarter of section 14; the south half of the southwest quarter, the southwest quarter of the southeast quarter terminating at the concrete bridge crossing Olney Creek in the southwest quarter of the southeast quarter of section 11. Together with those state lands 100 yards in width on either side of Marsh Creek Road beginning at its junction with Sultan Basin Road in the northeast quarter of the southeast quarter of section 9 crossing the northeast quarter of the southeast quarter, the southeast quarter of the northeast quarter and terminating at its crossing of Marsh Creek in the southeast quarter of the northeast quarter of section 9. Together with those lands in the northwest quarter of section 9, township 28N, range 8E. W.M. and the southwest quarter of the northeast quarter of section 9, township 28N, range 8E. W.M. and the north half of the southwest quarter of section 9, township 28N, range 8E. W.M. and the southwest quarter of the southwest quarter of section 9, township 28N, range 8E. W.M. and the northwest quarter of the southeast quarter of section 9, township 28N, range 8E. W.M. Together with the south half of the south half of section 16, township 28N, range 8E. W.M.
(56) Those portions of land in Sections 1, 11 and 12 Township 28 North, Range 8 East; Sections 5, 6 and 7 Township 28 North, Range 9 East; Sections 32 and 33 Township 29 North, Range 9 East W.M. situated in Snohomish County described as follows: Those lands 100 yards in width on the northwesterly side of Sultan Basin Road beginning at the concrete bridge crossing Olney Creek in the south half of said section 11 and traversing northeasterly through sections 1, 11 and 12; together with those lands 100 yards in width on the northwesterly side of Sultan Basin road traversing northeasterly through sections 5, 6 and 7 in Township 28 North, Range 9 East; together with those lands 100 yards in width on the northwesterly side of Sultan Basin road traversing northeasterly through sections 32 and 33 in Township 29 North, Range 9 East terminating at the intersection with an unnamed road approximately 1800 feet in distance southwesterly of the shoreline of Spada Lake in the northwest quarter of section 33 Township 29 North, Range 9 East. Together with those lands in section 16 Township 28 North, Range 8 East, W.M. situated in Snohomish County described as follows: the north half and the north half south half. Together with those lands in section 9 Township 28 North, Range 8 East W.M. situated in Snohomish County described as follows: the southeast quarter of the southwest quarter and the south half of the southeast quarter.