Donate today: make a difference
Join the community of caretakers
Help preserve Wisconsin's State Natural Areas for future generations. Give to the Endangered Resources Fund today!
Donate today: make a difference
a natural area by name.
a natural area by county.
Explore outdoors
and find places to go.
Use our interactive map
to find natural areas.
and help care for SNAs.
Contact information
For information on State Natural Areas, contact:
Thomas Meyer
Natural areas conservation biologist

Wisconsin State Natural Areas Program Koro Railroad Prairie (No. 225)



Along the Mascoutin Valley State Trail, Winnebago County. T17N-R14E, Section 17 W½SW¼. 3 acres.



Koro Prairie features a stretch of high-quality mesic prairie with many species of native prairie plants. Dominated by big bluestem, this site contians other common mesic prairie species such as switch grass, New Jersey tea, prairie dock, stiff goldenrod, and spiderwort. This remnant is especially noteworthy because of its location at the northeastern edge of the prairie-oak savanna region in Wisconsin. The site runs along an abandoned railroad right-of-way and frequent fires sparked by the trains helped maintain the fire-adapted prairie vegetation. Other species include mountain mint, shooting star, false dandelion, narrow-leaved loosestrife, turk's cap lily, culver's root, and Riddell's goldenrod. Koro Prairie is owned by Winnebago County and was designated a State Natural Area in 1990.


Driving directions

From the intersection of County Highways V and E just west of Rush Lake, go west on V one mile, then north on Koro Road 1.25 miles to the Winnebago County Recreational Trail. The site starts at the road and continues east along the trail for 0.4 mile.


Koro Railroad Prairie is owned by:

  • Winnebago County


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.

Non-DNR lands

Hunting and trapping

This is a non-DNR owned SNA: Opportunities for hunting and trapping depend on the land owner. Please contact them directly to find out about their rules for hunting and trapping. You can find a link to other owner websites under the "Resource links" heading above. More details regarding allowable uses of this non-DNR owned SNA may be posted, if available, under the "Access" tab above.

Back to Top

Prohibited activities

  • Horseback riding
  • Rock climbing
  • Vehicles, including bicycles, ATVs, aircraft, and snowmobiles except on trails and roadways designated for their use
  • Collecting of animals, 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
  • Camping and campfires
  • Geocaching

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

Last revised: Thursday, March 26, 2015