Preparation Canyon State Park

Preparation Canyon State Park, in the Loess Hills of western Iowa in Monona County, is a 344-acre park protecting one of the finest and most accessible sections of the Iowa Loess Hills — the globally rare formation of wind-deposited glacial silt that rises in dramatic knife-edge ridges above the Missouri River valley, with some of the thickest loess deposits in North America.

The park sits in and around Preparation Canyon — a deep, wooded ravine carved into the loess formation — and takes its name from a short-lived 1850s Mormon utopian community (‘Preparation’) that attempted to build a self-sufficient settlement in this isolated loess landscape. Today the park protects remnant native dry-prairie on the steep loess ridges, managed with prescribed fire, and offers hiking through some of the most dramatic Loess Hills terrain accessible from a day-use park. Preparation Canyon State Park is a treasured natural and historical icon of western Iowa.

Preparation Canyon State Park offers hiking on a trail system through the sharp Loess Hills terrain — climbing the knife-edge loess ridges for panoramic views of the Missouri River valley and the surrounding Loess Hills landscape, descending into the wooded ravines of Preparation Canyon, and exploring the native dry-prairie remnants on the steep loess slopes — along with wildlife watching, birding (grassland birds on the ridge tops, forest birds in the canyon), photography of the dramatic loess topography, and picnicking. The ridge-top Loess Hills hike and the canyon descent are the signature draws.

Spring (April through June) is the finest season at Preparation Canyon, when the dry-prairie wildflowers bloom on the loess slopes (coneflowers, prairie violets, lousewort) and the prescribed burns reveal the dramatic open loess topography at its most striking; fall brings golden prairie grass and oak color in the canyon. Summer is hot on the south-facing slopes but the canyon offers shade. Prescribed burns in spring open the landscape dramatically — check Iowa DNR for recent burn areas. Spring for wildflowers and burns, fall for the golden prairie and canyon color, and sunrise on the ridge for the best Missouri River panorama are the highlights.

Preparation Canyon takes its name from the utopian ‘Preparation Colony’ — a short-lived 1850s community of Latter-day Saint (Mormon) settlers led by Charles B. Thompson, who established a communitarian settlement (‘Preparation’) in this remote loess canyon in 1853, intending to build a self-sufficient religious community apart from the world. The colony collapsed within a few years amid internal conflict and financial scandal. The Loess Hills were part of the Yankton Sioux and Omaha peoples’ homeland. The park was established by Iowa DNR to protect the Loess Hills terrain and the Preparation Canyon site. The park preserves this intriguing blend of natural and historical heritage.

Preparation Canyon State Park protects a dramatic section of the Iowa Loess Hills — loess (wind-blown glacial silt) deposited to depths of 100 feet or more on the Missouri River bluffs during the late Pleistocene, then eroded by Preparation Creek and its tributaries into the characteristic knife-edge ridges, steep side ravines and the deep wooded canyon of the park. The loess deposits here are thick and well-expressed, creating the sharp, dramatic ridge topography that defines the formation. The wind-deposited loess, the bluff topography and the creek erosion created the dramatic canyon and ridge landscape of the park.

Preparation Canyon State Park’s Loess Hills grassland, dry-prairie remnants, wooded canyon and ravines support white-tailed deer, wild turkeys, dickcissels, Bell’s vireos, Henslow’s sparrows (rare, on native-prairie remnants), and other grassland and forest birds, along with migrant raptors on the Missouri corridor. The native-prairie remnants on the steep loess slopes harbor specialist prairie insects and plants. The canyon forest supports forest birds — wood thrushes, ovenbirds and migrant warblers. The grassland birds on the ridge-top prairie and the canyon forest birds are among the highlights.

Preparation Canyon State Park protects native dry-prairie remnants on the steep, south- and west-facing loess slopes — part of the globally rare Loess Hills dry-prairie ecosystem, maintained by prescribed fire against eastern red cedar invasion. The deep wooded canyon of Preparation Creek supports mesic forest, cottonwood-willow riparian vegetation and diverse wildlife. The contrast between the open, dry, sunny ridge-top prairie and the cool, moist, wooded canyon creates an unusually diverse set of habitats in a compact park. Protecting the native prairie, the fire regime and the canyon forest sustains the ecology of this exceptional Loess Hills park.

Preparation Canyon State Park holds a treasured place among the Loess Hills icons of western Iowa — a park protecting the dramatic loess ridge-and-canyon landscape and the site of Iowa’s most intriguing utopian settlement, the 1850s Preparation Colony, in a globally rare geological formation. For hikers and history seekers who discover it, the combination of dramatic loess scenery, native dry-prairie and an unusual historical footnote makes Preparation Canyon one of Iowa’s most surprising and rewarding small parks. It is a cherished natural and historical icon of the Iowa Loess Hills.

Preparation Canyon State Park is in western Iowa in Monona County, near the town of Moorhead, off Iowa Highway 183 (about 6 miles south of Onawa and about 40 miles north of Council Bluffs). The park has a small day-use area with parking, picnic facilities and the trail system; it is a day-use park (no camping). The park is free to visit. The nearest services are in Onawa (about 6 miles north) or Dunlap (about 20 miles east). Check Iowa DNR for current trail access, prescribed-burn schedules and any seasonal closures before visiting.

Iowa DNR manages Preparation Canyon State Park with prescribed fire to maintain the native Loess Hills dry-prairie remnants on the steep loess slopes. Visitors help by staying on designated trails (the loess slopes are highly erodible — off-trail travel causes immediate and lasting erosion damage), respecting fire-management areas and closures, not collecting any native plants or animals (the dry-prairie plant community is protected), packing out everything and following all park rules. The native prairie, the loess terrain and the canyon ecosystem are sensitive and protected. Protecting the fire regime and the native vegetation is essential.

The loess ridges are steep and highly erodible — stay on designated trails at all times; do not go off-trail on the ridge faces (erosion is severe and lasting). The south-facing loess slopes are hot and exposed in summer; carry water and sun protection. Watch for rattlesnakes (uncommon but present on the dry south-facing Loess Hills slopes). Ticks are common in the grassland and forest in warm weather. The gravel access roads can be muddy in wet weather. Respect the steep, fragile terrain, the summer heat, the rattlesnakes and the ticks.

The park is a day-use area; no overnight camping. Free to visit (no entry fee). Stay on designated trails; off-trail travel is not permitted on the loess slopes. Prescribed-fire areas are sometimes closed; respect all closure signs. Collect no plants or animals. Pets must be leashed. Pack out all trash. Watch for rattlesnakes; do not handle any snake you encounter. Check Iowa DNR for current access, burn schedules and any closures before visiting.

The town of Onawa (about 6 miles north, with the widest main street in Iowa — a local claim — and Missouri River access), the Loess Hills State Forest to the north and south, the Turin Loess Hills Preserve to the north, the Missouri River, the Waubonsie State Park far to the south (the largest Loess Hills park), and the Loess Hills Scenic Byway running the length of the formation lie near the park. The Loess Hills formation and the Missouri River valley define the region. Preparation Canyon anchors the mid-Hills hiking experience, a key stop on the Loess Hills Scenic Byway.

Hike the ridge-top trail at Preparation Canyon in spring after a prescribed burn for the most dramatic, open loess landscape — the knife-edge ridges with no cedar obstruction and the native prairie wildflowers emerging from the ash are spectacular. Or visit in fall for the golden prairie grass and oak color in the canyon. Watch for dickcissels and Bell’s vireos singing from the ridge-top prairie in June, look for native prairie wildflowers on the loess slopes in spring, and photograph the canyon descent into the wooded Preparation Creek ravine. Combine with a drive along the Loess Hills Scenic Byway north to the Turin preserve or south to Waubonsie State Park for the full Loess Hills experience.