Thirteenmile

Thirteenmile is a 12,294-acre Inventoried Roadless Area in the Colville National Forest, set across the montane ridges of the Kettle River Range in northeastern Washington. Four named summits define its topography: Granite Mountain, Fire Mountain, Thirteenmile Mountain, and Seventeenmile Mountain, stepping along a north–south ridgeline. The area sits at the very top of the Thirteenmile Creek–Sanpoil River watershed (HUC12 170200040108). Thirteenmile Creek and Ninemile Creek gather from steep forested draws on either flank of the ridge and run south toward the Sanpoil River. These small, cold tributaries shape the headwater hollows where snowmelt persists into early summer.

The forest is a mosaic ordered by elevation and aspect. On warm south slopes, Northern Rockies Ponderosa Pine Woodland holds widely spaced ponderosa pine (Pinus ponderosa) over bearberry (Arctostaphylos uva-ursi). At mid-elevations and on cooler aspects, Southern Rockies Mixed Conifer Forest carries Douglas-fir alongside Northern Rockies Western Larch Savanna, where western larch turns gold in October. Higher and in cold draws, Rocky Mountain Wet and Dry Subalpine Spruce-Fir Forest brings in subalpine fir and Engelmann spruce, with Rocky Mountain Lodgepole Pine Forest on post-fire benches. Northern Rockies Subalpine Woodland and Parkland on the upper ridges supports stands of whitebark pine (Pinus albicaulis). Twinflower (Linnaea borealis) and dwarf dogwood (Cornus canadensis) carpet the shaded floor of the spruce-fir; Carolina tassel-rue (Trautvetteria caroliniensis) marks wet seeps.

Canada lynx (Lynx canadensis) work the dense lodgepole and spruce-fir stands characteristic of this country, hunting snowshoe hare in the regenerating cover. North American wolverine (Gulo gulo luscus) move through the upper ridges, where the persistent snowpack in spring supports natal denning. In the canopy, Cassin's finch (Haemorhous cassinii), evening grosbeak (Coccothraustes vespertinus), and downy woodpecker (Dryobates pubescens) work the mixed conifer. Olive-sided flycatcher (Contopus cooperi) calls from dead spruce snags above the meadows. Rufous hummingbird (Selasphorus rufus) visits scarlet skyrocket (Ipomopsis aggregata) on the brushy edges in midsummer. In the cold headwater pools of Thirteenmile Creek, brook trout (Salvelinus fontinalis) hold along the streambed, and Pacific tree frog (Pseudacris regilla) calls from the shaded riparian zone. Bald eagle (Haliaeetus leucocephalus) winters along open downstream water. Portions of this area fall within the potential range of several federally listed species; see the Conservation section for details.

A walker climbing from Ninemile Creek toward Granite Mountain passes from open ponderosa pine into the closer-spaced fir, the understory shifting from bearberry to twinflower as elevation rises. On the ridge between Thirteenmile Mountain and Seventeenmile Mountain, scattered whitebark pine — slow-growing, gnarled, and increasingly rare — frame views east across the Kettle Range and west toward the Okanogan Highlands. In October, larch gold separates the dark spruce-fir; in late May, scarlet skyrocket and red baneberry (Actaea rubra) come up through last year's needles.

The Thirteenmile country lies in the upper Sanpoil River drainage of the Kettle River Range. Archaeology and oral history record continuous Native presence in this region for at least 9,000 years [2]. "The original inhabitants of what is now Ferry County were several semi-nomadic Indian tribes, with the Colville predominating" [1]. Their principal fishing, rendezvous, and trading point was Kettle Falls on the Columbia River, where bands from across the Plateau gathered each spring and summer for the salmon runs [1]. Trails radiated from these uplands west over the Okanogan highlands, east over the Kettle Range, and south down the nearby Sanpoil River [4].

Recorded European contact began in 1811 when North West Company trader and surveyor David Thompson reached Kettle Falls [1][2]. The Hudson's Bay Company established Fort Colvile on the east bank of the Columbia in 1825, drawing Sinixt, Colville, and other Plateau hunters into the regional fur trade [1]. In April 1872, "the Colville Reservation was established by executive order. Originally a vast part of present Ferry and Okanogan counties" [1]. On July 1, 1892, the United States government purchased the northern half of the reservation for $1,500,000, about one dollar per acre [1].

Gold drove the next transformation. After minerals were discovered in the region, the northern half was opened to prospectors on February 21, 1896 [1][4]. Within a year a tent camp at Eureka Gulch had grown into the mining town renamed Republic; by spring 1898 it held 2,000 people [4]. The Republic Mine declared a $150,000 dividend in 1898 [4], and "by 1900, approximately 12,500 mining claims had been staked in Ferry County" [1]. The southern half of the reservation was opened to prospectors on June 30, 1898 [1]. Logging followed in step: "In 1897, Patrick H. Walsh erected the first sawmill in Ferry County. The San Poil Lumber Company, incorporated in May 1899, was typical of many that supplied timbers for mines, building materials for growing communities and, soon, ties for railroads" [1].

Federal protection arrived in the same decade. "The Colville Forest Reserve was established by proclamation from President Theodore Roosevelt on March 1, 1907" [3], setting aside 870,000 acres of former Colville Reservation land [1]. The Forest headquarters office was located over the Keller store on Main Street in Republic [3]. The Republic Ranger District has existed continuously since 1907, with H. W. Hougland as its first ranger [3]. The Colville was transferred from the Pacific Northwest Region to the Northern Region on January 1, 1943, then returned to the Pacific Northwest Region on July 1, 1974 [3].

Much of the new national forest remained largely inaccessible until the 1930s, when the Civilian Conservation Corps built miles of forest roads and strung electric lines linking fire lookouts and ranger stations across Ferry County [1]. In 2020, the Tonasket Ranger District was transferred from the Okanogan–Wenatchee to the Colville [3]. Today the 12,294-acre Thirteenmile Inventoried Roadless Area, in the Thirteenmile Creek–Sanpoil River headwaters, is administered by the Republic Ranger District under the 2001 Roadless Area Conservation Rule.

Vital Resources Protected

• Climate Refugia for Whitebark Pine and Subalpine Communities: The Thirteenmile roadless block protects Northern Rockies Subalpine Woodland and Parkland on the upper ridges of Granite Mountain, Fire Mountain, Thirteenmile Mountain, and Seventeenmile Mountain, where federally threatened whitebark pine (Pinus albicaulis) holds at its lower elevational limit in this part of Washington. The roadless condition keeps the slow-growing stands accessible to natural fire and seed-dispersing Clark's nutcracker rather than fragmented by road-based salvage and management activities, preserving the conditions whitebark pine needs for natural regeneration under climate stress.

• Canada Lynx and Snowshoe Hare Habitat Connectivity: Continuous Rocky Mountain Lodgepole Pine Forest, Rocky Mountain Wet Subalpine Spruce-Fir Forest, and Southern Rockies Mixed Conifer Forest provide the multi-aged conifer structure that Canada lynx requires in this part of its range. The roadless designation preserves the dense regenerating stands and downed-wood complexity that support snowshoe hare populations, and it keeps Thirteenmile functionally connected to the larger Kettle Range lynx landscape — roads being a documented threat to the species under the IUCN Roads and Railroads category.

• Cold Headwater Stream Integrity: The area protects the Thirteenmile Creek–Sanpoil River headwaters, gathered from Thirteenmile Creek and Ninemile Creek. Without an internal road network, the small streams retain stable banks, shaded canopy, and low fine-sediment loads — the conditions native salmonids in the broader Sanpoil system depend on for spawning substrate quality and dissolved oxygen.

Potential Effects of Road Construction

• Whitebark Pine Loss and Subalpine Disruption: New road construction across Northern Rockies Subalpine Woodland and Parkland would directly remove whitebark pine canopy and the slow-recruiting seedlings around the upper ridges. Roads function as vectors for white pine blister rust (Cronartium ribicola) and mountain pine beetle (Dendroctonus ponderosae) — already the primary cause of whitebark mortality in the region — and road-enabled salvage following blowdown or fire eliminates the standing dead trees that nutcracker-dispersed seed depends on for regeneration sites. Recovery of these high-elevation stands requires multiple human generations of cone production, with no possibility of replanting at landscape scale.

• Lynx Habitat Fragmentation and Edge Effects: Linear road corridors through Rocky Mountain Lodgepole Pine Forest and Rocky Mountain Subalpine Spruce-Fir Forest create high-light, high-wind edges that extend 50 to 100 meters into the interior, displacing the dense seedling-sapling cover snowshoe hare require. Roads also bring increased human access and incidental mortality risk to lynx; re-establishment of pre-disturbance stand structure requires multi-decade succession on this short subalpine growing season.

• Sedimentation of Sanpoil Headwater Tributaries: Road construction across the steep, decomposed-granite cut slopes of Granite Mountain and Fire Mountain would deliver chronic fine-sediment pulses into Thirteenmile Creek and Ninemile Creek with every storm and snowmelt cycle. Sediment embeds cobble interstices and degrades the spawning substrate quality on which downstream salmonids depend; once gravels are loaded with fines, recovery requires decades of high flows to re-sort the substrate, and culvert crossings can sever upstream-downstream movement entirely. Invasive grasses such as cheatgrass (Bromus tectorum), already documented as ecosystem-level threats in adjacent steppe communities, spread readily along disturbed road corridors and alter fire return intervals once established.

Access to the Thirteenmile roadless block is from three perimeter trailheads on the Republic Ranger District of the Colville National Forest: Cougar, Barnaby Buttes, and Bear Pot. From these, two native-surface trails lead into the interior: 13 Mile Trail (23) at 12.0 miles and Bear Pot Trail (19) at 0.8 miles, both designated for horse use. The 13 Mile is the spine of the area, a long ridge route linking Granite Mountain, Fire Mountain, Thirteenmile Mountain, and Seventeenmile Mountain — practical for multi-day horse-pack trips or hiker traverses. There are no developed campgrounds inside the area; overnight visitors should plan for backcountry camping on durable benches away from water sources and follow Leave No Trace principles for the high country.

Big-game hunting is a primary use. The block lies in established habitat for deer, elk, and other Kettle Range species; the lodgepole stands and aspen edges concentrate game where forest cover meets meadow forage. Black bear and cougar follow the same elevation band. Hunters should check current Washington Department of Fish and Wildlife regulations and Game Management Unit boundaries before each trip; Cougar, Barnaby Buttes, and Bear Pot trailheads are the standard pack-in points, and the 13 Mile Trail allows access by horse for the long traverse from one end of the area to the other.

Fishing focuses on the cold headwater tributaries — Thirteenmile Creek and Ninemile Creek — and downstream into the Sanpoil River. The streams within the area are small, cold, and steep, holding brook trout (Salvelinus fontinalis) and native salmonids. Bull trout occur in the broader Sanpoil system and are federally protected; anglers must identify catch carefully and follow WDFW special regulations for the Columbia tributaries, including any closures protecting threatened species. Pacific chorus frog (Pseudacris regilla) calls from the shaded riparian zones — a good cue for finding the wet pockets worth fishing.

Birding here is dispersed. Within the area, the ponderosa pine and mixed-conifer slopes hold downy woodpecker (Dryobates pubescens) on the snag tops, and the subalpine ridges support birds typical of the Kettle Range high country. For trip planning, the broader Sanpoil corridor surrounding Thirteenmile holds 9 active eBird hotspots within 24 km, including Sanpoil River Valley (151 species), Mud Lake (145), Republic Sewage Treatment Pond (130), Sanpoil Lake (118), and Sherman Pass (91). These road-accessible sites complement backcountry observation inside the roadless block.

Photographers find subjects in the Western Larch Savanna in mid-October, when larch needles turn gold against the dark spruce-fir backdrop; in late-summer ridgetop light at Granite Mountain and Seventeenmile Mountain, where scattered whitebark pine frames views east across the Kettle Range and west toward the Okanogan Highlands; and along the riparian zones of Thirteenmile Creek and Ninemile Creek, where Carolina bugbane and red baneberry mark the wet seeps. Horse-packing on the 13 Mile Trail is the practical long-distance use here, with forage in the ridgetop meadows and water at trailside springs.

The recreation on offer at Thirteenmile depends directly on the roadless condition. Lynx and game range stays intact because the interior is undisturbed by motorized travel; whitebark pine on the upper ridges persists without road-spread disease; and the quiet that hunters, hikers, and horse-packers value is a function of no internal road network. The three perimeter trailheads keep access available while protecting the conditions that make this country worth riding into.