William O'Brien State Park

Stephanie Herington / P&TC Photo Contest
Minnesota icon with star along eastern edge central
About the park

Established in 1947, William O’Brien was the first metro area state park. It’s eastern border runs along the St. Croix River, which is a migratory pathway for birds and important habitat for many mammals. The river offers canoeing and kayaking opportunities.

In the 1970s the park expanded westward into the grasslands and forests. Many miles of hiking and skiing trails and camping grounds lie here. The visitor center is named for one of the leaders of Parks & Trails Council, Samuel H. Morgan, who was instrumental in the expansion effort.

Prior to white colonial occupation, Dakota and Anishinaabe (Ojibwe) peoples called this area home. Fur traders used the river for transport in the 1600s, followed by lumberjacks in the mid-1800s. The park’s namesake comes from a lumber baron who owned the land prior to passing it on to his daughter, Alice. She donated the first 180 acres that formed the nucleus of the park.

On this page

Natural oasis on the edge of the metro.

Exploring the Park

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Park Location

Park Highlights

Trails

Camping

Activities

Events

at William O'Brien State Park
Wooden benches arranged in a circle in a misty, lush forest. The scene is calm, with a carpet of fallen leaves on the ground and towering trees surrounding the area.

Sat, Nov 22, 2025 at 12:30 PM

Wander with a Naturalist

A serene riverside scene with tall trees casting shadows on the grassy bank. The calm river flows gently, reflecting the blue sky and surrounded by lush green foliage. In the distance, sunlight illuminates the landscape, creating a peaceful ambiance.

Sat, Oct 25, 2025 at 1:00 PM

Buckthorn Removal Resource Day

A narrow dirt path winds through a dense forest in autumn. Tall trees surround the path, their leaves displaying shades of green, yellow, and orange. The forest floor is covered with fallen leaves, adding a vibrant splash of color to the serene landscape.

Sat, Oct 25, 2025 at 10:00 AM

Fall Color Hike – Oaks

Our Land Projects

for William O'Brien State Park

P&TC Projects by the numbers

Projects
0
Acres
1000
Year of Last Project
2025

Our Land project stories

A panoramic view of a natural landscape in autumn featuring a green path through a field with colorful foliage and a cloudy sky.

Major Expansion

In 1971, the MnDNR began a major expansion effort for William O’Brien State Park, with the intent to add a rolling, partly wooded area. However, as the DNR waited in limbo for the Legislature to authorize the expansion, a housing developer began purchasing portions. P&TC responded by launching a major fundraising campaign and securing buyer agreements within the proposed expansion area. At the same time, we lobbied the Legislature to pass the boundary expansion bill. Thanks to generous support from individuals and foundations, we acquired nearly all the land in this area in seven separate land deals. By 1973 the Legislature authorized the expansion and P&TC conveyed the land to the state. More details are recounted in Samuel H. Morgan’s Environmental Recollections book.

A peaceful rural scene featuring a lush green meadow with a trail leading to a small, white-roofed structure, surrounded by dense trees and underbrush, bathed in soft sunlight.

Small Parcel Added

A small parcel along the railroad and near the campground that was notched out of the first project P&TC added to the park, was later acquired.

A scenic landscape under a bright sun with a clear blue sky. The foreground has a grassy meadow and small evergreen trees, while in the background, mist hovers over a densely wooded area with autumn foliage. The overall atmosphere at William O'Brien State Park is serene and natural.
This former farm site is now part of the park.

Former Farmland Acquired

This property was owned by a farmer who wanted to see the land become part of the park. Part of the land was an in-holding within the park and the other was outside the statutory boundaries and required legislative action to be incorporated. In December of 1994 P&TC purchased the full 80 acres but eventually, after easement and other issues were worked out, four acres were sold back to the landowners.

A serene dirt path meanders through a misty meadow dotted with yellow wildflowers, flanked by lush green trees under a hazy sky.

Farm Inside Park

More farmland was acquired. This land is located in the middle of the park with much of the surrounding land already within park ownership. This acquisition began to close that gap.

A scenic view of a wildflower meadow with abundant yellow blooms, framed by green trees under a cloudy sky.
Field of goldenrod on west side of Ostrum Trail N. within property PTC acquired.

Historic 17 Springs Farm

This property was owned by Joan Grant, who acquired it from her father-in-law. He purchased it in 1940, when it was known as the “17 Springs Farm” and was used as a trout farm. The upper springs and the stream are natural spawning areas for native brook trout. A home on the property was built in 1850 and qualifies for inclusion in the National Register of Historic Places. An arrangement allows the owner to retain control of the home until her death, at which point the home could potentially be retained by the park for historical interpretation, or it may be removed from the site.

An old, weathered barn stands amid tall grass under a clear blue sky in William O'Brien State Park. Two smaller, equally dilapidated structures are nearby. An overgrown conveyor belt emerges from the grass in the foreground, adding to the scene's abandoned and rustic ambiance.
The old barn before it was removed and converted into parkland.

Old Farm Becomes Part of Park

Parks & Trails Council of Minnesota bought this incredible property and conveyed it to the park in a series of transactions ending in 2023. It was previously owned by a man who was born there and spent 80 years of his life enjoying the idyllic setting. When it was time to move on he entertained numerous offers but ultimately sold to P&TC knowing that we would preserve it for the park.

This property also provides a preferred route for the Gateway State Trail to connect to the state park.

View toward the St. Croix River from this property.

Preserving river views

currently held in trust by P&TC

Parks & Trails Council of Minnesota purchased 5.4 acres of undeveloped land on a bluff overlooking the St. Croix River on Nov. 19, securing a rare opportunity to protect property adjacent to William O’Brien State Park. The two-year acquisition process involved resolving survey and easement issues. The land includes grasslands and bluff terrain. P&TC will hold the property in trust while working with the MNDNR to add it to the park’s statutory boundary.