09164 - Tea Lake

Tea Lake Roadless Area encompasses 5,510 acres within the Chequamegon-Nicolet National Forest in northern Wisconsin. The landscape is defined by its hydrology: the area contains headwaters of the Marengo River, which flows through the roadless area alongside Whisky Creek and Blaser Creek. These waterways originate in and drain through a mosaic of forest types and wetlands, creating a hydrologically significant landscape where water movement shapes both the terrain and the communities that inhabit it.

The forest composition shifts across moisture and elevation gradients. Northern Hardwood Forest dominates drier upland areas, where sugar maple (Acer saccharum), yellow birch (Betula alleghaniensis), and eastern hemlock (Tsuga canadensis), near threatened (IUCN), form the canopy. In areas with higher moisture, Northern Mesic Forest transitions to Northern Wet-Mesic Forest, where black spruce (Picea mariana) and tamarack (Larix laricina) become increasingly common. The understory in these wetter zones includes mountain holly (Ilex mucronata), creeping snowberry (Gaultheria hispidula), and Braun's holly fern (Polystichum braunii). Open Bog and Muskeg communities support specialized vegetation adapted to saturated, acidic conditions: purple pitcher plant (Sarracenia purpurea) and round-leaved sundew (Drosera rotundifolia) are carnivorous plants that supplement nutrient uptake in these nutrient-poor soils, while swamp birch (Betula pumila) and tamarack form the woody component.

The area supports a diverse predator guild. The federally endangered gray wolf (Canis lupus) and the federally threatened Canada lynx (Lynx canadensis) hunt white-tailed deer (Odocoileus virginianus) and American red squirrel (Tamiasciurus hudsonicus) across the forested landscape. The federally endangered Northern Long-Eared Bat (Myotis septentrionalis) hunts insects in the canopy and understory. Brook trout (Salvelinus fontinalis) inhabit the cold, clear streams that drain the area, feeding on aquatic invertebrates and serving as prey for broad-winged hawks (Buteo platypterus). American beaver (Castor canadensis) engineer wetland habitat throughout the drainage system, their dams creating pools that alter water flow and forest composition. The monarch butterfly (Danaus plexippus), proposed for federal threatened status, depends on milkweed plants in open and transitional areas as larval host plants.

The Ojibwe, part of the Anishinaabe Nation alongside the Odawa and Potawatomi, inhabited and managed these lands long before federal designation. The Tea Lake area lies within territory ceded to the U.S. government through the 1837 and 1842 treaties with Lake Superior Ojibwe bands, who reserved the right to hunt, fish, and gather. The Ojibwe practiced selective tree felling and controlled burning to encourage specific habitats, working with natural ecosystems rather than through large-scale engineering. Seasonal subsistence cycles governed land use: maple sugar production and spear fishing in spring, crop planting and berry and medicinal plant gathering in summer, wild rice harvesting and large game hunting in autumn, and trapping and hunting in winter. Cultural practices including tobacco offerings before harvesting plants demonstrated respect for the land. Today, the Lac Vieux Desert Band of Lake Superior Chippewa Indians, the Bad River Band, and the Lac du Flambeau Band continue to exercise off-reservation treaty rights in this area, harvesting timber, fish, game, and plants under a 1998 Memorandum of Understanding with the Forest Service and the Great Lakes Indian Fish & Wildlife Commission.

Industrial logging transformed the landscape in the late nineteenth and early twentieth centuries. Timber barons harvested primary old-growth white pine and northern hardwoods across the Great North Woods region, establishing temporary logging camps that moved once local timber was exhausted. The region became crisscrossed by narrow-gauge railways and road corridors dating to the late 1800s, built to extract timber. By the 1920s, the land was over-cut, burned-over, and farmed-out, with much becoming tax-delinquent and abandoned by owners.

Federal acquisition began under the Weeks Act of 1911, which authorized the purchase of private lands to protect the headwaters of navigable streams. The Clarke-McNary Act of 1924 expanded this authority to include lands for timber production. In 1925, the Wisconsin legislature granted the federal government permission to acquire and manage lands as National Forests. The Tea Lake area became part of the Nicolet National Forest upon its proclamation by President Franklin D. Roosevelt on March 2, 1933, formed from several purchase units including Moquah, Flambeau, Oneida, Mondeaux, and Oconto. In July 1933, the original forest was divided, and the western unit became the Chequamegon National Forest in November 1933. President Harry S. Truman enlarged both forests in 1952 through Executive Order 10374, adding lands acquired under the Bankhead-Jones Farm Tenant Act and the Weeks Act.

In the 1930s, the Civilian Conservation Corps built fire towers, fire lanes, and early forest roads throughout the district and performed extensive reforestation, planting much of the second-growth forest visible today. Most trees in the area are even-aged second growth from this era. Forest acreage grew from approximately 409,000 acres in 1929 to over 1.5 million acres today through continuous acquisition of tax-delinquent and abandoned lands.

The Tea Lake area was identified during the Second Roadless Area Review and Evaluation in 1979 for potential wilderness designation. It remains managed as a Semi-Primitive Non-Motorized area, preserving its remote character. In 2001, the area was designated a protected Inventoried Roadless Area under the Roadless Area Conservation Rule.

Vital Resources Protected

Headwater Protection for the Marengo River and Upper Chippewa Basin

The Tea Lake area contains the headwaters of the Marengo River and feeds Whisky Creek and Blaser Creek—tributaries that drain into the Upper Chippewa River basin, a system identified by the U.S. Forest Service as a Priority Watershed for clean water delivery to Lake Superior. The roadless condition maintains natural hydrologic flow and prevents the sedimentation that permanent road networks generate. Without roads, riparian soils remain stable, and stream channels retain their capacity to support cold-water dependent species and maintain water quality downstream.

Northern Long-Eared Bat Maternity and Foraging Habitat

The Northern Long-Eared Bat, federally endangered, depends on the intact forest canopy structure across the Tea Lake area for roosting and insect foraging. The mixed hardwood and aspen-birch forests provide the continuous, unfragmented canopy this species requires to navigate between maternity colonies and feeding grounds. Road construction fragments this canopy, creates edge habitat that exposes bats to predators and wind, and reduces the insect abundance that supports their survival during the critical breeding season.

American Marten Recovery Corridor

The Tea Lake roadless area is part of the Chequamegon-Nicolet's primary recovery zone for American Marten, a state-endangered mammal that requires large, contiguous blocks of mature forest with abundant large woody debris. The unfragmented forest structure here—maintained by the absence of roads and associated logging—provides the denning sites and prey habitat (small rodents in complex understory) that marten need to recolonize northern Wisconsin. Once forest is fragmented by roads and edge effects, marten populations cannot recover, as they do not cross open areas or use edge habitat.

Bog and Wetland Hydrological Integrity

The open bog and muskeg ecosystems within Tea Lake depend on intact water tables and natural drainage patterns. These wetlands filter water moving toward downstream systems and provide specialized habitat for species adapted to saturated soils. Road construction and associated fill material disrupt groundwater flow, lower water tables, and allow invasive species like purple loosestrife and reed canary grass to establish in disturbed, drained margins—converting native wetland plant communities to invasive monocultures that provide no food or shelter for native wildlife.

Threats from Road Construction

Sedimentation and Stream Temperature Increase from Canopy Removal

Road construction requires cutting slopes and removing forest canopy along the roadbed and in cleared rights-of-way. Exposed mineral soil erodes during precipitation events, delivering sediment into the headwater streams that feed the Marengo River system. Loss of streamside forest canopy allows solar radiation to warm water, raising temperatures above the tolerance of cold-water species and reducing dissolved oxygen. These changes are particularly damaging in headwater streams, where even small temperature increases can eliminate spawning habitat for species dependent on cold, clear water—including those that support the Lake Superior ecosystem downstream.

Habitat Fragmentation and Edge Effects on Federally Endangered Species

Road construction divides the continuous forest into isolated patches, fragmenting the habitat that Northern Long-Eared Bats and Canada Lynx require to move between foraging and denning areas. The road itself and its cleared margins create "edge"—abrupt transitions between forest and open ground where predators hunt more effectively and wind exposure increases. For the Northern Long-Eared Bat, edge habitat reduces insect availability and increases predation risk during critical foraging periods. For Canada Lynx, fragmentation breaks the connectivity of snowshoe hare habitat, the primary prey species, making the area unsuitable for lynx recovery even if the lynx themselves could cross the road.

Invasion Corridors for Non-Native Species into Wetlands and Forest

Road construction creates a disturbed corridor of bare soil, compacted ground, and altered hydrology that invasive species use to penetrate into previously intact ecosystems. Purple loosestrife and reed canary grass, already documented as threats in the Chequamegon-Nicolet, rapidly colonize the wet margins of roads and ditches, outcompeting native wetland plants and degrading the specialized habitat that supports native wildlife. In the forest, garlic mustard and buckthorn establish along roadsides and spread into the interior, reducing the diversity of understory plants and the small mammals and insects that depend on them—cascading to affect American Marten survival and Northern Long-Eared Bat foraging success.

Disruption of Bog and Muskeg Hydrology

Road fill placed across wetlands and bog margins blocks groundwater flow and raises the ground surface, lowering water tables in adjacent peatlands. This drainage stress converts saturated bog soils to drier conditions where invasive species establish and native bog plants decline. Once hydrological function is disrupted, restoration is extremely difficult—peatlands develop over centuries, and the specialized plant and microbial communities that characterize them cannot be recreated once the water regime is altered. The loss of bog function also reduces the area's capacity to filter and store water, diminishing its role in maintaining the clean water that the Marengo River system provides to Lake Superior.

The Tea Lake Roadless Area encompasses 5,510 acres of northern Wisconsin forest—a mix of hardwood, aspen-birch, and wet-mesic ecosystems that supports diverse recreation opportunities dependent on the area's roadless character. Access to the interior is by foot, canoe, or carry-in only, with parking available where forest roads meet the roadless boundary.

Hunting

White-tailed deer hunting is the primary game pursuit here, conducted during Wisconsin's gun and archery seasons in the Northern Forest Zone. The area's northern hardwood and aspen-birch forests provide quality deer habitat. Ruffed grouse also inhabit these forests. Hunters must follow all WDNR regulations, including a 150-yard safety buffer from campgrounds and developed sites. Only portable tree stands and ground blinds are permitted; they must be removed within one week after season close. Off-road vehicle use is prohibited—hunters access the area on foot from the roadless boundary. The walk-in character of this hunting is preserved by the absence of interior roads.

Fishing

The Marengo River flows through the area as an excellent trout stream, supporting brook trout and rainbow trout in its upper reaches. Whisky Creek and its unnamed tributary (a Class I Exceptional Resource Water) hold brook trout in cold, spring-fed sections. Blaser Creek, a Class II trout stream, also supports brook trout. Tea Lake, a 50-acre seepage lake within the roadless boundary, holds walleye, largemouth bass, northern pike, and panfish. Trout season runs from the first Saturday in May through October 15. The Marengo River and its tributaries are Lake Superior tributaries requiring an Inland Trout Stamp in addition to a Wisconsin fishing license. Access to Tea Lake and the upper Marengo River is by hiking or canoeing only; there are no developed boat launches within the roadless area. The roadless condition preserves the cold-water habitat these trout streams depend on—a 450-foot no-aspen-regeneration zone protects the streams from warming.

Birding

The area's diverse forest types support breeding warblers including Nashville, Yellow-rumped, Black-throated Green, Golden-winged, Chestnut-sided, and Mourning Warblers, along with Blue-headed Vireo, Northern Parula, and Blackburnian Warbler. Woodpeckers present include Red-bellied, Northern Flicker, and the elusive Black-backed Woodpecker in mature tamarack and black spruce bog habitat. Raptors include Broad-winged and Sharp-shinned Hawks. Wetland and bog areas host Winter Wren, Northern Waterthrush, Canada Warbler, Lincoln's Sparrow, and Palm Warbler. Winter irruptions may bring Pine Grosbeak, Red Crossbill, White-winged Crossbill, Common Redpoll, and Pine Siskin. Access is by foot travel only; the roadless interior provides undisturbed forest habitat critical for breeding songbirds and the quiet necessary for birding.

Paddling and Fishing Access

Tea Lake offers quiet-water paddling on a 50-acre seepage lake. The Marengo River, while documented as an excellent trout stream, flows through terrain with portages and beaver dams. Access to Tea Lake and the upper Marengo River is by canoe or carry-in from the roadless boundary; no developed boat launches exist within the area. The roadless condition preserves the undisturbed watershed these waters depend on.

Photography

The North Country National Scenic Trail crosses the Marengo River valley, providing access to three documented scenic overlooks. The Marengo Overlook offers a spectacular view of the Marengo River Gorge, a 1,000-foot-deep cut through the landscape. Marengo Falls, located approximately 1.5 miles downstream from Snake Trail Road access, is a 40–50 foot cascading drop with a secondary 10–12 foot waterfall below. The area's northern hardwood forests, featuring sugar maple stands, are particularly scenic during autumn. Mesic hardwood forest, hemlock stands, bogs, and muskegs provide diverse botanical subjects. Wildlife photography opportunities include woodland birds, deer, and native brook trout in the Marengo River. The roadless character preserves the quiet and undisturbed forest conditions that support the wildlife and scenic views that draw photographers to the area.