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For information on State Natural Areas, contact:
Thomas Meyer
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Wisconsin State Natural Areas Program Centennial Bedrock Glade (No. 329)

Centennial Bedrock Glade

Photo by Thomas A. Meyer

Resource links:

Interstate State Park


Overview

Location

Within Interstate Park, Polk County. T33N-R19W, Section 1 S½SW¼NW NE . 17 acres.

Description

Description

Centennial Bedrock Glade features an outstanding example of an acid bedrock glade, a rare natural community in Wisconsin. The site is situated on a prominent exposure of basalt bedrock near the Dalles of the St. Croix River within Interstate State Park. The hot, dry conditions and thin soil of the glade are habitat for a variety of plants and other organisms adapted to the harsh microclimate. They include a diverse assemblage of lichens and dry prairie plants. Also found here is the rare prairie fame-flower (Talinum rugospermum), a succulent endemic to the upper midwest. The woodland surrounding the glade openings supports stunted open-grown oaks. Centennial Bedrock Glade is owned by the DNR and was designated a State Natural Area in 2000.

Access

Driving directions

From the junction of U.S. Highway 8 and State Highway 35 in St. Croix Falls, go south on 35 0.3 mile to the Interstate Park entrance. Park maps are available at the visitor center.

Ownership

Centennial Bedrock Glade is owned by:

  • WDNR

Maps

The DNR's state natural areas program is comprised of lands owned by the state, private conservation organizations, municipalities, other governmental agencies, educational institutions and private individuals. While the majority of SNAs are open to the public, access may vary according to individual ownership policies. Public use restrictions may apply due to public safety, or to protect endangered or threatened species or unique natural features. Lands may be temporarily closed due to specific management activities. Users are encouraged to contact the landowner for more specific details.

The data shown on these maps have been obtained from various sources, and are of varying age, reliability, and resolution. The data may contain errors or omissions and should not be interpreted as a legal representation of legal ownership boundaries.

Objectives

Site objectives

Manage the site as a reserve for bedrock glade, as a significant geological site, and as an ecological reference area. Natural processes and limited prescribed fire will determine the structure of the natural communities of this site. Provide opportunities for research and education on one of the highest quality native bedrock glades.

Management approach

The native species on the bedrock glade (primarily oaks) are managed in a mostly passive manner. However, some thinning of the canopy, understory manipulation, and shrub control via brushing or fire may be needed to mimic natural disturbance patterns. Other allowable activities across the entire site include control of invasive plants and animals and access to suppress wildfires.

Site-specific considerations

  • The bedrock glade is fragile (particularly the lichens that are found there). Since trampling of lichens presents a threat to this community, public use is preferably limited to researchers and small education groups.

Recreation

Very few State Natural Areas have public facilities, but nearly all are open for a variety of recreational activities as indicated below. Generally, there are no picnic areas, restrooms, or other developments. Parking lots or designated parking areas are noted on individual SNA pages and maps. Trails, if present, are typically undesignated footpaths. If a developed trail is present, it will normally be noted on the SNA map and/or under the "Access" tab. A compass and topographic map or a GPS unit are useful tools for exploring larger, isolated SNAs.

Allowable activities

In general, the activities listed below are allowed on all DNR-owned SNA lands. Exceptions to this list of public uses, such as SNAs closed to hunting, are noted under the "Access" tab above and posted with signs on site.

  • Hiking
  • Fishing
  • Cross country skiing
  • Hunting
  • Trapping

Prohibited activities

  • Camping and campfires
  • Collecting of animals (other than legally harvested species), non-edible fungi, rocks, minerals, fossils, archaeological artifacts, soil, downed wood, or any other natural material, alive or dead. Collecting for scientific research requires a permit issued by the DNR
  • Collecting of plants including seeds, roots or other non-edible parts of herbaceous plants such as wildflowers or grasses
  • Drone use, unless authorized by a SNA research permit
  • Geocaching
  • Horseback riding
  • Rock climbing
  • Vehicles, including bicycles, ATVs, aircraft, and snowmobiles except on trails and roadways designated for their use

For rules governing state-owned SNAs and other state lands, please consult Chapter NR 45 Wis. Admin. Code [exit DNR]

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Last revised: Thursday, October 19, 2017