Thorne River

The Thorne River roadless area encompasses 72,983 acres of Tongass National Forest on the northern interior of Prince of Wales Island in the Alexander Archipelago of southeast Alaska. The area spans varied terrain anchored by Manty Mountain and North Point. The Thorne River—one of the most significant anadromous fish watersheds on Prince of Wales Island—originates within the roadless area and gathers tributaries including Hatchery Creek, Ratz Creek, Sal Creek, Slide Creek, Logjam Creek, Luck Creek, Gravelly Creek, and Little Ratz Creek, as well as Lake Galea. Wolf Pass Falls marks the divide between sub-drainages in the upper watershed.

Forest communities follow elevation and moisture across the area. Western hemlock (Tsuga heterophylla) dominates valley bottoms alongside western red-cedar (Thuja plicata) in the wettest corridors. Alaska-cedar (Callitropsis nootkatensis) and mountain hemlock (Tsuga mertensiana) occupy higher-elevation and wetter exposures, with subalpine fir (Abies lasiocarpa) at upper margins. The understory holds devil's-club (Oplopanax horridus), oval-leaf huckleberry (Vaccinium ovalifolium), and deer fern (Struthiopteris spicant), with stairstep moss (Hylocomium splendens) and lettuce lichen (Lobaria oregana)—a nitrogen-fixing foliose lichen sensitive to canopy disturbance—marking old-growth structure. Saturated depressions support white bog orchid (Platanthera dilatata)—IUCN Vulnerable—alongside bog buckbean (Menyanthes trifoliata) and common Labrador-tea (Rhododendron groenlandicum). Alaska holly fern (Polystichum setigerum, Vulnerable) and Menzies' burnet (Sanguisorba menziesii, Vulnerable) occur at streamside margins throughout the drainage.

The Thorne River and its tributaries sustain coho (Oncorhynchus kisutch), Chinook (Oncorhynchus tshawytscha), and pink salmon (Oncorhynchus gorbuscha), along with resident coastal cutthroat trout (Oncorhynchus clarkii) and Dolly Varden (Salvelinus malma). American black bears (Ursus americanus) concentrate along stream corridors during salmon runs; mule deer (Odocoileus hemionus) browse the forest understory. Spruce grouse (Canachites canadensis) move through mature hemlock stands; western toads (Anaxyrus boreas) breed in stream margins and lake edges. The robust lancetooth snail (Haplotrema vancouverense) and Pacific bananaslug (Ariolimax columbianus) inhabit the moist forest floor. Hydnellum mirabile—IUCN Vulnerable, a tooth fungus associated with old-growth soil communities—has been documented within the area. Portions of this area fall within the potential range of several federally listed species; see the Conservation section for details.

The Honker Divide Canoe Route (Trail 54790, 24.6 miles) threads the interior of the roadless area through a connected series of lakes and portages. Moving through this route, a visitor alternates between river-bottom hemlock-cedar forest and open lake surfaces, crossing low watershed divides between adjacent sub-drainages. The route passes Lake Galea and Wolf Pass Falls, where the forest floor transitions between deep moss, bog margins, and streamside stands of kneeling angelica (Angelica genuflexa) and clasping twisted-stalk (Streptopus amplexifolius).

The Thorne River drains the forested interior of Prince of Wales Island, Alaska's largest island and one of the richest biological landscapes in the Alexander Archipelago. Long before European contact, the watershed lay within the territory of the Takjik'aan Kwáan, the Tlingit people of the Prince of Wales Island coast [2]. Tlingit communities maintained seasonal camps, fishing sites, and travel routes along the river systems of the island's interior, including the drainages that feed the Thorne River watershed.

During the eighteenth century, the Kaigani Haida began migrating northward from Graham Island in present-day British Columbia, gradually displacing Tlingit groups from the southern portion of Prince of Wales Island and pushing the Tongass Tlingit into the island's northern reaches [1]. The Thorne River watershed, situated in the northern interior of the island, remained within Tlingit territory even as the balance of peoples on the island shifted. The overlapping claims to land and waterways that emerged from this period shaped the indigenous geography that later federal administrators would encounter when the United States purchased Alaska from Russia in 1867.

Commercial extraction arrived on the island in the decades following American acquisition. Salmon canneries established footholds along the coast in the 1870s and 1880s, exploiting the abundant runs in streams like those feeding the Thorne River. Logging followed as the demand for Sitka spruce and western red-cedar grew with the development of Pacific Coast cities and, later, the pulp and paper industry.

In 1902, President Theodore Roosevelt established the Alexander Archipelago Forest Reserve as a precursor to the national forest system in Alaska [3]. Five years later, in 1907, the Tongass National Forest was established by presidential proclamation, consolidating federal management over millions of acres of southeast Alaska forest, including the lands surrounding the Thorne River [3].

The most transformative period for the Thorne River area came in 1951, when the U.S. Forest Service entered the first of two fifty-year timber contracts with the Ketchikan Pulp Company (KPC) [3]. These contracts authorized large-scale commercial timber harvesting across the Tongass, including the Prince of Wales Island landscape. In 1960, KPC established a floating logging camp at Thorne Bay, on the eastern shore of Prince of Wales Island [4]. Two years later, in 1962, the company relocated its main logging camp from Hollis to Thorne Bay, constructing a shop, barge terminal, and log sort yard that made it the largest logging camp in North America at the time [4]. Roads built to connect Thorne Bay with Hollis, Craig, and Klawock opened the interior of the island to sustained industrial harvest [4]. The town of Thorne Bay evolved from a company-owned camp into an incorporated city by 1982, its existence directly shaped by the federal timber program [4].

Commercial timber operations on Prince of Wales Island continued under the KPC contract until market conditions and environmental regulation brought major harvests to a close in the 1990s. The Thorne River roadless area today retains the old-growth forest character that defined this landscape before industrial-scale logging reached its margins.

Vital Resources Protected

Cold-Water Stream Integrity

The Thorne River and its network of named tributaries—Hatchery Creek, Ratz Creek, Sal Creek, Slide Creek, Logjam Creek, Luck Creek, Gravelly Creek, and Little Ratz Creek—constitute one of Prince of Wales Island's most significant anadromous watersheds. The roadless condition of this 72,983-acre area means that stream banks and valley-bottom forest have not been subjected to the road cuts and slope disturbance that generate chronic sediment loads. Undisturbed riparian corridors deliver large woody debris to stream channels, creating the deep pools and complex spawning gravels that coho, Chinook, and pink salmon require, while intact canopy maintains cold water temperatures critical for resident cutthroat trout and Dolly Varden.

Old-Growth Structural Complexity

Interior stands of Alaska-cedar (Callitropsis nootkatensis) and western red-cedar support ecological functions that require centuries to develop. Lettuce lichen (Lobaria oregana), a nitrogen-fixing foliose lichen sensitive to canopy disturbance, indicates stand continuity in old-growth hemlock and cedar throughout the area. Hydnellum mirabile (IUCN Vulnerable), a tooth fungus associated with old-growth soil communities, has been documented within the area. Alaska-cedar faces documented climate-driven mortality as snowpack declines at lower elevations; the oldest individuals here represent climate-buffered refugia where the species may persist.

Bog and Wetland Habitat

Saturated depressions and bog margins across the roadless landscape support wetland specialists that depend on undisturbed hydrological conditions. White bog orchid (Platanthera dilatata, IUCN Vulnerable) occupies low-nutrient, waterlogged sites; Alaska holly fern (Polystichum setigerum, Vulnerable) and Menzies' burnet (Sanguisorba menziesii, Vulnerable) occur at streamside margins throughout the drainage. These microhabitats depend on the water table maintained by intact upland forest and undisturbed peat-forming conditions.

Potential Effects of Road Construction

Sedimentation and Anadromous Stream Degradation

Road construction on the steep, rain-saturated slopes surrounding the Thorne River tributaries would generate sediment pulses that smother spawning gravels and fill the deep pools that salmon depend on. Fine sediment reduces egg survival and limits juvenile rearing capacity in anadromous reaches. Even properly designed culverts at stream crossings can create perching barriers that restrict salmon migration to upstream spawning habitat during critical seasonal windows.

Old-Growth Fragmentation and Alaska-Cedar Harvest

Road access historically enables selective harvest of Alaska-cedar and western red-cedar—species requiring centuries to develop old-growth structural complexity. Fragmentation by road corridors increases wind throw along newly exposed edges and reduces the effective area of intact old-growth stands. For Alaska-cedar, already under documented climate pressure, road-enabled harvest removes the oldest individuals that represent the species' best near-term buffer against regional mortality.

Wetland Hydrological Disruption and Invasive Species

Road fill and drainage structures alter the surface water flows that maintain bog and wetland microhabitats. Changes to the water table in peat-forming systems can shift plant communities rapidly, eliminating the conditions that white bog orchid and other hydrologically sensitive species require. Road corridors also function as dispersal pathways for invasive plant species—reed canary grass (Phalaris arundinacea) and bull thistle (Cirsium vulgare) are present in the broader Prince of Wales Island landscape—which can colonize disturbed streambanks and displace native riparian and bog communities.

Thorne River encompasses 72,983 acres of Tongass National Forest on the northern interior of Prince of Wales Island, accessible by road through the Thorne Bay Ranger District. Eagles Nest campground provides an established base for visits to the area.

Paddling: Honker Divide Canoe Route

The Honker Divide Canoe Route (Trail 54790, 24.6 miles) is the defining recreational feature of the Thorne River roadless area. The route follows a connected series of lakes and river segments through the interior, requiring portages across the watershed divides that separate adjacent sub-drainages. Paddlers travel through hemlock-cedar valley forest and across open lake surfaces, passing Lake Galea and Wolf Pass Falls as the route threads the upper Thorne River watershed. This is a multi-day trip for most paddlers; water levels in river sections vary seasonally, and portages require carrying gear across trail-less terrain. The roadless condition of the surrounding landscape means paddlers travel through continuous old-growth forest and intact riparian corridors without road crossings or developed infrastructure on the water.

Fishing

The Thorne River system is one of Prince of Wales Island's most productive anadromous watersheds. Coho salmon (Oncorhynchus kisutch), Chinook salmon (Oncorhynchus tshawytscha), and pink salmon (Oncorhynchus gorbuscha) use the Thorne River and its tributaries—coho entering freshwater from late August through October, Chinook moving earlier in summer. Coastal cutthroat trout (Oncorhynchus clarkii) and Dolly Varden (Salvelinus malma) are resident year-round in cold tributary streams. Rainbow trout and steelhead (Oncorhynchus mykiss) also occur in the system. Fishing pressure in the roadless interior remains low due to the absence of roads; the Honker Divide Canoe Route provides the primary means of reaching interior reaches. The nearshore waters accessible from Thorne Bay below the roadless watershed hold Pacific halibut (Hippoglossus stenolepis), buffalo sculpin (Enophrys bison), and masked greenling (Hexagrammos octogrammus). Anglers should carry current Alaska Department of Fish and Game regulations for all species.

Wildlife Observation and Hunting

American black bears (Ursus americanus) concentrate along stream corridors during salmon runs in late summer and fall. Mule deer (Odocoileus hemionus) are the primary ungulate and are hunted across the Thorne Bay Ranger District. Spruce grouse (Canachites canadensis) occupy mature hemlock stands and are encountered during forest travel.

Red-throated loons (Gavia stellata) and ring-necked ducks (Aythya collaris) use the interior lakes along the Honker Divide Canoe Route. Pacific wrens (Troglodytes pacificus) are heard in dense streamside forest throughout the area; Lincoln's sparrows (Melospiza lincolnii) occupy shrubby stream margins. The western screech-owl (Megascops kennicottii) and northern flying squirrel (Glaucomys sabrinus) are documented within the old-growth forest. American mink (Neogale vison) forage along stream banks and lake edges.

Roadless Character

The Honker Divide Canoe Route, interior fishing on the Thorne River tributaries, and wildlife observation across this watershed all depend on the area's roadless condition. Road construction would introduce sediment to anadromous streams, alter the hydrology of bog and lake margins along the route, and fragment the old-growth forest that provides continuous cover across the portage corridors—ending the backcountry paddling character that makes this area distinct from the developed road system on the surrounding island.