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Wisconsin State Natural Areas Program Oakfield Ledge (No. 190)

Oakfield Ledge

Photo by Thomas A. Meyer



Fond du Lac County. T14N-R16E, Sections 23, 27, 28, 33. 211 acres.



Oakfield Ledge is one of the most significant exposures of the Niagara Escarpment in Wisconsin, a 650-mile long ridge that runs north from Waukesha County, forms the spine of the Door peninsula, then arcs east through Ontario and ends at Niagara Falls in New York. Located along Horicon Marsh, the hard, erosion resistant Niagara dolomite walls form a series of prominent rock cliffs 40' high - what locals call "the ledge". Deep crevices have formed along fractures in the bedrock. The vegetation of the shaded cliff and boulder strewn steep slope is the most undisturbed and consists of basswood, sugar maple, slippery elm, rock elm, mountain maple, and shagbark hickory. Groundcover includes extensive patches of Canada yew and the shaded cliffs provide habitat for walking, cliff brake, and fragile ferns. Spring seeps provide a moist forest floor habitat for interrupted fern, wild sarsaparilla and pale-flowered leafcup and small creeks with mud bottoms contain great blue lobelia, and swamp saxifrage. A diverse snail fauna inhabits the base of the ledge. Oakfield Ledge is owned by the DNR and was designated a State Natural Area in 1983.


Driving directions

Access: From the intersection of County Highways B and Y south of Oakfield, go south on B 3.2 miles, then east on Breakneck Road 0.6 mile to a parking area at the top of hill.

Visitation Guidelines: Oakfield Ledge is open daily 6:00 a.m. - 8:00 p.m. Food and beverage are not allowed in the natural area.


Oakfield Ledge is owned by:

  • WDNR


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.


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
  • 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: Monday, June 10, 2019