Flandrau State Park
| Company type | State park |
|---|---|
| Industry | Recreation, Conservation |
| Founded | 1934 |
| Headquarters | New Ulm , United States |
Area served | Minnesota |
| Products | Outdoor recreation, historic preservation, wildlife habitat |
Flandrau State Park is a state park located in Minnesota along the banks of the Cottonwood River, close to New Ulm. Initially designated as Cottonwood River State Park, it was renamed in 1945 to commemorate Charles Eugene Flandrau, a prominent Minnesota figure who played a key role in defending New Ulm during the Dakota War of 1862. The park's development in the 1930s was part of a job creation initiative and included a recreational reservoir formed by a dam, which sustained repeated flood damage before its removal in 1995.
The park contains buildings constructed by the Civilian Conservation Corps (CCC) and Works Progress Administration (WPA), showcasing the National Park Service rustic architectural style. These structures uniquely incorporate elements inspired by New Ulm’s ethnic German background. During World War II, the WPA barracks were repurposed as Camp New Ulm, serving as a detention site for German prisoners of war. This collection of historic buildings constitutes a district recognized on the National Register of Historic Places.
Geography
Flandrau State Park lies within a valley sculpted by the eastward-flowing Cottonwood River, featuring marshy oxbow lakes that mark former river paths. The valley walls ascend between 150 and 200 feet, with the Cottonwood joining the Minnesota River approximately 1.5 miles east of the park boundary. Originating about 90 miles to the west in Lyon County, the river’s course is followed at the park’s edge by tree-lined slopes that shield nearby developments. The northern section of the park, including its campground, falls inside New Ulm’s city limits. Access within the park is limited to the south side of the river since no bridges span it here; notably, the group center is situated at the terminus of a gated road on this bank.
Geology
The geological foundation of Flandrau State Park consists of shale, sandstone, and conglomerate bedrock formed roughly 100 million years ago during the late Cretaceous era beneath what was then the Western Interior Seaway. The sandstone layers contain fossilized vegetation and iron oxide streaks, while conglomerate deposits include granite pebbles dating back 2.5 to 3 billion years.
Overlying this bedrock is glacial till deposited several thousand years ago by continental glaciers, creating a ground moraine between 100 and 200 feet thick. This till primarily comprises local rock fragments but also includes materials transported from Canada and northern Minnesota. Numerous springs emerge at the base of this glacial deposit, particularly prominent in the western portion of the park.
As glaciers receded, Glacial River Warren carved out a deep channel now occupied by today’s Minnesota River. Tributaries such as the Cottonwood River descend sharply into this expansive valley, accounting for its pronounced incision through thick glacial till and Cretaceous bedrock layers. Historical erosive forces likely generated waterfalls and rapids prior to establishing the current gradual slope.
Flora
The plant communities within Flandrau State Park represent those typical of the Upper Minnesota River Country Biocultural Region. Although original tallgrass prairie ecosystems have vanished, much of the forested river valley remains intact. The valley floor hosts marshes and wet prairies alongside bottomland hardwood forests composed of willow, eastern cottonwood, American elm, silver maple, and green ash species. Steeper valley slopes support northern hardwood forests; cooler north-facing aspects favor sugar maple, basswood, and common hackberry, while drier south-facing slopes are dominated by bur oak, eastern red cedar, and aspen trees. Some dry hilltops sustain prairie grasses such as big bluestem and indian grass.
Since European settlement, vegetation patterns have shifted: without periodic wildfires to regulate growth, forests on valley sides have become denser and prairie areas have been encroached upon by sumac shrubs. Dutch elm disease has diminished elm populations significantly. Much of the valley floor now consists of secondary forest due to previous agricultural use and flooding associated with the former reservoir.
Fauna
Despite the ongoing development in the surrounding area, Flandrau serves as an essential refuge for native wildlife. The park is home to 25 different mammal species, including white-tailed deer, coyotes, gray foxes, raccoons, beavers, skunks, opossums, and minks. Birdwatchers have documented over 168 bird species here, featuring numerous migratory warblers, flycatchers, vireos, and thrushes. The Cottonwood River supports various fish species valued by anglers, such as northern pike and smallmouth bass, alongside several types of rough fish.
Cultural history
Archaeological evidence near the park reveals that Native Americans occupied this region as far back as 7,000 years ago. By the time Europeans arrived in the mid-1600s, the Dakota Sioux were the area's primary inhabitants. Settlers began establishing communities in the Cottonwood Valley during the 1830s; however, frequent flooding led to most abandoning these settlements within a century.
State park creation
In response to unemployment during the Great Depression, federal funds were allocated to develop parks. The Cottonwood River valley was selected due to its relatively populated location lacking major recreational spaces and the presence of unused land requiring flood control. Minnesota acquired the property in 1934. The first Works Progress Administration (WPA) crew arrived in September, initially living in tents while constructing bunkhouses, a mess hall, and administrative offices. These experienced workers quarried stone and built three prominent park structures: a beachhouse, a manager’s residence, and a garage.
By June 1935, a second group from the Civilian Conservation Corps (CCC) set up camp in the park’s southwest corner. This team of less-experienced laborers constructed the dam and earthen dikes, built a kitchen shelter, carried out landscaping tasks including tree planting, and established trails. Both WPA and CCC crews cleared trees from what would become the lakebed. Initially, World War I veterans from the Veterans Conservation Corps (VCC) worked on-site; by July 1936, they were replaced by younger unemployed men typical of CCC projects.
The dam was completed in 1937 after two years of work, creating a new reservoir. WPA activities continued until 1941 while CCC efforts lasted until 1942. Following these projects’ conclusion, the WPA camp was converted into a group center whereas the CCC camp was dismantled.
The stone buildings constructed by WPA are recognized by the Minnesota Historical Society as "the most distinctive architectural designs within the state park system." Architect Edward W. Barber incorporated elements reflecting local German heritage into their rustic style, characterized by steeply pitched roofs, dormer windows, chimneys, casement windows with small panes, and detailed stone masonry. The beachhouse stands as one of Minnesota’s largest New Deal-era constructions within state parks.
Camp New Ulm
During World War II, the group camp originally built by WPA was repurposed to detain German prisoners of war in the United States. Due to labor shortages caused by military enlistment and Britain’s limited capacity for POWs, the U.S. established numerous camps nationwide housing approximately 450,000 prisoners who contributed labor outside defense industries. Minnesota hosted nine such camps—including one at Whitewater—all coordinated from a regional headquarters located in Algona, Iowa.
In June 1944, roughly 160 German POWs arrived at Camp New Ulm; most were young Luftwaffe personnel aged between 18 and 25. They were supervised by twelve U.S. Army guards. The prisoners mainly worked at Sleepy Eye’s cannery facility, which funded their housing costs. After harvest season ended, they found employment at brick and tile manufacturing plants such as Ochs Brick in Springfield and at a poultry processing facility. Small groups worked without guards on nearby farms as temporary laborers. During winter months they returned to Algona’s main camp but came back each spring. By 1945 farm labor expanded across eight counties with POWs playing a significant role in packing Sleepy Eye’s largest pea harvest.
Camp New Ulm’s proximity to a town with strong German heritage proved advantageous for prisoners; many residents spoke German and showed empathy toward them while hoping for news from relatives overseas. German-speaking clergy conducted Lutheran and Catholic worship services and provided reading materials. Despite warnings from guards discouraging contact with civilians, food was frequently passed over fences; cannery employees shared treats; locals occasionally socialized near camp boundaries; and POWs working on farms enjoyed home-cooked meals with host families.
One notable event involved prisoner Helmut Lichtenberg leaving camp unaccompanied to visit a farm family; he was apprehended and placed in solitary confinement while Americans who aided him were fined $300. This incident represents the camp’s only recorded escape attempt.
Recreational amenities included a clubhouse featuring a fireplace and library, a camp store, sports fields, workshops for crafting furniture and equipment, plus access to Cottonwood Lake for swimming and fishing activities. Entertainment options comprised newspapers, radios, weekly film screenings, musical instruments, and Sunday concerts attended by local residents.
Camp New Ulm ceased operations in December 1945; all POWs were repatriated afterward. One former prisoner later immigrated to America and settled in Wisconsin. Today, this camp remains preserved as part of the state park’s group center—one of few World War II POW camps still intact—and can be visited upon request through the park office when not occupied.
Recent history
By the time of World War II, efforts were underway to rename the park in honor of Charles Flandrau (1828–1903), a distinguished Minnesota attorney, Indian agent, and political figure who served on the territorial supreme court and led New Ulm’s defense during the Dakota War of 1862. This renaming was finalized in March 1945.
In 1947, flooding caused significant damage to the Cottonwood Lake Dam, which was subsequently reconstructed at considerable cost. Additional flood events in 1965 and 1969 inflicted further harm. After federal funding for repairs was denied in 1965, state authorities decided to build a smaller dam alongside a separate swimming pool. Local opinions were split on whether to restore the lake, prompting an independent analysis that found rebuilding the dam would enhance panfish habitat and prevent invasive carp but would not provide effective flood control. Factors such as the basin’s limited capacity, increased agricultural drainage, loss of wetlands, and sediment buildup contributed to high restoration costs and questionable sustainability. The possibility of hydroelectric power generation was also ruled out.
The state parks director advised against reconstructing the dam. By 1995, remaining dam structures were removed, allowing the Cottonwood River to flow freely once more. An interpretive plaque highlights that while nearly two hundred workers took two years to construct the dam, it was dismantled by a team of four using heavy machinery within five months.
Recreation
Flandrau State Park provides of trails suitable for hiking, walking, and running, many of which connect directly to nearby streets such as Indian Point Drive and Summit Avenue, resulting in substantial walk-in visitation. During winter months, six miles of trails are maintained for cross-country skiing, with an additional two miles groomed for snowshoeing.
The park contains three campgrounds offering a total of 92 sites—34 equipped with electrical hookups—as well as three private walk-in campsites. Visitors may rent two camper cabins or reserve the historic group center that accommodates up to 110 guests across eight bunkhouses.
A notable feature of the day-use area is a chlorinated swimming pool with a sand bottom, located next to a historic beachhouse and picnic amenities including a playground, volleyball courts, horseshoe pits, and a shelter available for reservation.
Fishing activities are concentrated primarily along the accessible downstream bank of the Cottonwood River on the park’s eastern side.
Flandrau State Park enjoys a prime location adjacent to Nehls City Park, the private New Ulm Country Club, and August Schell Brewing Company. Additionally, landmarks such as the Hermann Heights Monument and Martin Luther College lie just blocks from the park entrance.