Less than a mile across, its 249 acres are relatively shallow, with a maximum depth of only 16'.
Brush Creek enters the lake from the southeast, winding down through broad bogs from Brush Lake.
To the west, less than a mile of Bog Creek connects the outflow of Bog Lake to Mitawan Creek. Because of its location, it is essentially a dead end and does not provide ready access to other lakes or to the Isabella River. The forests surrounding the lake date from a major, stand replacing fire back in 1824, significant portions of which burned again in 1864. The Independence Day windstorms of 1999 did no significant damage in the Bog Lake area. Campsites Bog supports three established campsites, all on the northern shore of the lake.