9.0 mi of trail, end to end · about 800 ft of climbing · 31 ft–167 ft · native material surface · trail No. 21534 · trail class 3 · typical grade 12-20% · tread 18-24 inches wide · hiking, bike · seasonal: hiking 05/15-09/15
Lodges
Along the wayPetersburg Lake Cabin
TrailheadsPetersburg Lake Trailhead 44 ft Drive there · Petersburg Mountain Trailhead 44 ft Drive there
Petersburg Lake Trailhead the Forest Service's write-up
The Petersburg Lake and Petersburg Mountain Trailheads are located on Kupreanof Island near the State Dock. The Petersburg Lake Trail heads south along an old roadbed.
Petersburg Mountain Trailhead the Forest Service's write-up
The Petersburg Lake and Petersburg Mountain Trailheads are located on Kupreanof Island near the State Dock. The Petersburg Mountain Trail heads north along an old roadbed.
The lines are the US Forest Service's National Forest System trails layer (public domain), read 2026-10-16 and simplified for the map; the length is the line's, end to end, and the class, surface, grade and tread width are the forest's own entries where it publishes them - a forest that publishes the centreline alone has none. The trailheads and the points along the way are the Service's recreation points, and the write-ups its own recarea text, unedited. Heights come from USGS 3DEP through Terrain Tiles on AWS (Mapzen/Tilezen), read along each line and rounded; a short trail on steep ground can be off by a few tens of feet. Closures change: check the forest's own site before you go.
