Thorson Prairie WMA

       
   

Area and County

    Polk County
    Northwest Minnesota
     
 

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Size

1,109.12 acres

 
 
Maps

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Complete

 

North Section

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Central Section

 

South Section

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Parking

There are six designated parking areas:

CR 44 (160th Ave. SW)
N47 40.502, W96 23.703

170th Ave. SW
N47 40.733, W96 25.000

340th St. SW
N47 40.389, W96 24.662

350th St. SW (West)
N47 39.553, W96 24.884

350th St. SW (East)
N47 39.535, W96 24.797

MN Hwy 102
N47 38.406, W96 24.875

 
Hiking Trails

The 52-mile Agassiz Recreational Trail, an off-highway vehicle (OHV) trail, passes through this WMA on an old railroad bed closely paralleling MN Highway 102.

 
Hunting

All hunting and trapping. See Hunting and Trapping Regulations (MN DNR) for details.


Ecological Classification Province  

Tallgrass Aspen Parklands

Ecological Classification
Section  

Lake Agassiz, Aspen Parklands

Subsection(s)  

Aspen Parklands

Land Type Association(s)

Beach Ridges

Gentilly Lake Plain

 
Native Plant Communities1

Agassiz Interbeach Prairie Complex

Calcareous Fen (Northwestern)

Dry Sand - Gravel Prairie (Northern)

Mesic Prairie (Northern)

Northwestern Wet-Mesic Aspen Woodland

Seepage Meadow/Carr

Seepage Meadow/Carr: Tussock Sedge Subtype

Wet Brush-Prairie (Northern)

Wet Prairie (Northern)

Wet Seepage Prairie (Northern)


Ownership Minnesota DNR logo        
 
Links

Minnesota DNR


Comments

Farm Field
Thereis a 58.5-acre plot of cultivated row cropland in the north section.


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Parking

  Thorson Prairie WMA   Thorson Prairie WMA
  There are two parking lots on 350th St. SW. The west lot on the north side of the road is well concealed behind tall shrubs.
       
  Thorson Prairie WMA    
  The east lot on the south side of the road is larger and easy to find at the top of the hill.
       

Trails

  Thorson Prairie WMA   Thorson Prairie WMA
       

Gravel Pit

  Thorson Prairie WMA    
       

Other Prairie

  Thorson Prairie WMA    
       
       
       

 

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MinnesotaSeasons.com Observations

   

Birds

One bird species with conservation status in Minnesota hasbeen seen here:

 

Special concern

Greater Prairie-chicken (Tympanuchus cupido)

 
 

Black-capped Chickadee (Poecile atricapillus)

Cedar Waxwing (Bombycilla cedrorum)

Gray Catbird (Dumetella carolinensis)

House Finch (Carpodacus mexicanus)

Cedar Waxwing


Fungi and Lichens

Black Knot (Apiosporina morbosa)

Black Knot


Insects and Arachnids

bald-faced hornet (Dolichovespula maculata)

Carolina grasshopper (Dissosteira carolina)

deer fly (Chrysops mitis)

dog day cicada (Neotibicen canicularis)

dusky stink bug (Euschistus tristigmus luridus)

goldenrod bunch gall midge (Rhopalomyia solidaginis)

goldenrod gall fly (Eurosta solidaginis)

monarch (Danaus plexippus)

multicolored Asian lady beetle (Harmonia axyridis)

seven-spotted lady beetle (Coccinella septempunctata)

willow pinecone gall midge (Rabdophaga strobiloides)

Carolina grasshopper

dog day cicada

monarch


Mammals

One mammal species with conservation status in Minnesota has been seen here:

 

Special concern

moose (Alces americanus)

 
 

plains pocket gopher (Geomys bursarius)

plains pocket gopher


Plants

Two plant species with conservation status in Minnesota are found here:

 

Endangered

woolly groundsel (Packera cana)

 

Special concern

small white lady’s slipper (Cypripedium candidum)

 
 

Minnesota Biodiversity Atlas Plant List

 
 

Plants frequently found in:

Calcareous Fen (Northwestern) OPp93a

Dry Sand - Gravel Prairie (Northern) UPn12b

Mesic Prairie (Northern) UPn23b

Northwestern Wet-Mesic Aspen Woodland FDw44

Seepage Meadow/Carr WMs83a

Seepage Meadow/Carr: Tussock Sedge Subtype WMs83a1

Wet Brush-Prairie (Northern) WPn53b

Wet Prairie (Northern) WPn53c

Wet Seepage Prairie (Northern) WPn53a

 
 

 

==================== 8/17/2017 ====================

alfalfa (Medicago sativa ssp. sativa)

arctic brome (Bromus kalmii)

American bugleweed (Lycopus americanus)

asparagus (Asparagus officinalis)

Balkan catchfly (Silene csereii)

Baltic rush (Juncus balticus var. littoralis)

bastard toadflax (Comandra umbellata ssp. umbellata)

bearded wheatgrass (Elymus trachycaulus ssp. subsecundus)

Bebb’s willow (Salix bebbiana)

big bluestem (Andropogon gerardii)

bird’s-foot trefoil (Lotus corniculatus var. corniculatus)

black-eyed Susan (Rudbeckia hirta var. pulcherrima)

blue grama (Bouteloua gracilis)

blue-eyed grass (Sisyrinchium sp.)

bog birch (Betula pumila)

bottle gentian (Gentiana andrewsii)

boxelder (Acer negundo var. negundo)

broad-leaved cattail (Typha latifolia)

brook lobelia (Lobelia kalmii)

Buxbaum’s sedge (Carex buxbaumii)

Canada anemone (Anemone canadensis)

Canada thistle (Cirsium arvense)

Canadian tick-trefoil (Desmodium canadense)

chokecherry (Prunus virginiana var. virginiana)

common evening primrose (Oenothera biennis)

common lilac (Syringa vulgaris)

common milkweed (Asclepias syriaca)

common mullein (Verbascum thapsus ssp. thapsus)

common sneezeweed (Helenium autumnale)

common strawberry (Fragaria virginiana)

crown vetch (Securigera varia)

dark green bulrush (Scirpus atrovirens)

dotted blazing star (Liatris punctata var. punctata)

falsegold groundsel (Packera pseudaurea var. semicordata)

field sow thistle (Sonchus arvensis)

flat-topped aster (Doellingeria umbellata)

Flodman’s thistle (Cirsium flodmanii)

four-flowered yellow loosestrife (Lysimachia quadriflora)

giant goldenrod (Solidago gigantea)

giant sunflower (Helianthus giganteus)

golden alexanders (Zizia aurea)

golden ragwort (Packera aurea)

grass-leaved goldenrod (Euthamia graminifolia var. graminifolia)

gray goldenrod (Solidago nemoralis)

green milkweed (Asclepias viridiflora)

grimmia dry rock moss (Grimmia laevigata)

grooved yellow flax (Linum sulcatum var. sulcatum)

hairy false goldenaster (Heterotheca villosa)

hairy panic grass (Dichanthelium acuminatum)

harebell (Campanula rotundifolia)

hoary alyssum (Berteroa incana)

hybrid cattail (Typha × glauca)

Indian hemp (Apocynum cannabinum)

Indiangrass (Sorghastrum nutans)

June grass (Koeleria macrantha)

Kentucky bluegrass (Poa pratensis ssp. pratensis)

leadplant (Amorpha canescens)

lesser fringed gentian (Gentianopsis virgata ssp. virgata)

little bluestem (Schizachyrium scoparium var. scoparium)

long-headed coneflower (Ratibida columnifera)

marsh arrow-grass (Triglochin palustris)

Maximilian’s sunflower (Helianthus maximilianii)

narrow-leaved cattail (Typha angustifolia)

narrow-leaved purple coneflower (Echinacea angustifolia)

needle-and-thread (Hesperostipa comata ssp. comata)

New England aster (Symphyotrichum novae-angliae)

North American common reed (Phragmites australis ssp. americanus)

northern bog aster (Symphyotrichum boreale)

northern plains blazing star (Liatris ligulistylis)

Nuttall’s little rose (Chamaerhodos erecta ssp. nuttallii)

peachleaf willow (Salix amygdaloides)

Pennsylvania cinquefoil (Potentilla pensylvanica)

plains cottonwood (Populus deltoides ssp. molinifera)

plains muhly (Muhlenbergia cuspidata)

plumeless thistle (Carduus acanthoides)

poke milkweed (Asclepias exaltata)

porcupine grass (Hesperostipa spartea)

prairie alumroot (Heuchera richardsonii)

prairie blazing star (Liatris pycnostachya var. pycnostachya)

prairie cordgrass (Spartina pectinata)

prairie dropseed (Sporobolus heterolepis)

prairie goldenrod (Solidago ptarmicoides)

prairie onion (Allium stellatum)

prairie rose (Rosa arkansana)

prairie sagewort (Artemisia frigida)

prairie wedge grass (Sphenopholis obtusata)

purple prairie clover (Dalea purpurea var. purpurea)

purple-stem aster (Symphyotrichum puniceum var. puniceum)

pussy willow (Salix discolor)

quackgrass (Elymus repens)

quaking aspen (Populus tremuloides)

red clover (Trifolium pratense)

red osier dogwood (Cornus sericea ssp. sericea)

red three-awn (Aristida purpurea var. longiseta)

Riddell’s goldenrod (Oligoneuron riddellii)

rough blazing star (Liatris aspera)

rough-fruited cinquefoil (Potentilla recta)

sage-leaved willow (Salix candida)

prairie willow (Salix humilis)

sand cherry (Prunus pumila)

sandbar willow (Salix interior)

scouring rush horsetail (Equisetum hyemale var. affine)

seaside arrowgrass (Triglochin maritima)

shorthair goldenrod (Solidago altissima ssp. gilvocanescens)

shrubby cinquefoil (Dasiphora fruticosa ssp. floribunda)

Siberian elm (Ulmus pumila)

sideoats grama (Bouteloua curtipendula var. curtipendula)

silky aster (Symphyotrichum sericeum)

slender wheatgrass (Elymus trachycaulus ssp. trachycaulus)

slender willow (Salix petiolaris)

slender-leaf false foxglove (Agalinis tenuifolia)

slim-stem reedgrass (Calamagrostis stricta)

small white lady’s slipper (Cypripedium candidum)

smooth brome (Bromus inermis)

smooth sumac (Rhus glabra)

spiked muhly (Muhlenbergia glomerata)

spikeoat (Avenula hookeri)

spotted Joe Pye weed (Eutrochium maculatum)

spotted knapweed (Centaurea stoebe ssp. micranthos)

spotted water hemlock (Cicuta maculata)

sterile sedge (Carex sterilis)

sticky false asphodel (Triantha glutinosa)

stiff goldenrod (Solidago rigida ssp. rigida)

stiff sunflower (Helianthus pauciflorus ssp. subrhomboideus)

swamp betony (Pedicularis lanceolata)

swamp milkweed (Asclepias incarnata ssp. incarnata)

swamp thistle (Cirsium muticum)

tall cinquefoil (Drymocallis arguta)

tall meadow rue (Thalictrum dasycarpum)

tarragon (Artemisia dracunculus)

toothed evening primrose (Oenothera serrulata)

Torrey’s rush (Juncus torreyi)

tufted hairgrass (Deschampsia cespitosa)

Virginia mountain mint (Pycnanthemum virginianum)

water horsetail (Equisetum fluviatile)

western marbleseed (Lithospermum occidentale)

white heath aster (Symphyotrichum ericoides var. ericoides)

white panicled aster (Symphyotrichum lanceolatum)

white rattlesnake root (Nabalus albus)

white sage (Artemisia ludoviciana ssp. ludoviciana)

white sweet clover (Melilotus albus)

Wilcox’s panic grass (Dichanthelium wilcoxianum)

wild licorice (Glycyrrhiza lepidota)

wolfberry (Symphoricarpos occidentalis)

woodbine (Parthenocissus vitacea)

woolly cinquefoil (Potentilla hippiana)

woolly groundsel (Packera cana)

 

Acer negundo var. negundo (boxelder)

Agalinis tenuifolia (slender-leaf false foxglove)

Allium stellatum (prairie onion)

Amorpha canescens (leadplant)

Andropogon gerardii (big bluestem)

Anemone canadensis (Canada anemone)

Apocynum cannabinum (Indian hemp)

Aristida purpurea var. longiseta (red three-awn)

Artemisia dracunculus (tarragon)

Artemisia frigida (prairie sagewort)

Artemisia ludoviciana ssp. ludoviciana (white sage)

Asclepias exaltata (poke milkweed)

Asclepias incarnata ssp. incarnata (swamp milkweed)

Asclepias syriaca (common milkweed)

Asclepias viridiflora (green milkweed)

Asparagus officinalis (asparagus)

Avenula hookeri (spikeoat)

Berteroa incana (hoary alyssum)

Betula pumila (bog birch)

Bouteloua curtipendula var. curtipendula (sideoats grama)

Bouteloua gracilis (blue grama)

Bromus inermis (smooth brome)

Bromus kalmii (arctic brome)

Calamagrostis stricta (slim-stem reedgrass)

Campanula rotundifolia (harebell)

Carduus acanthoides (plumeless thistle)

Carex buxbaumii (Buxbaum’s sedge)

Carex sterilis (sterile sedge)

Centaurea stoebe ssp. micranthos (spotted knapweed)

Chamaerhodos erecta ssp. nuttallii (Nuttall’s little rose)

Cicuta maculata (spotted water hemlock)

Cirsium arvense (Canada thistle)

Cirsium flodmanii (Flodman’s thistle)

Cirsium muticum (swamp thistle)

Comandra umbellata ssp. umbellata (bastard toadflax)

Cornus sericea ssp. sericea (red osier dogwood)

Cypripedium candidum (small white lady’s slipper)

Dalea purpurea var. purpurea (purple prairie clover)

Dasiphora fruticosa ssp. floribunda (shrubby cinquefoil)

Deschampsia cespitosa (tufted hairgrass)

Desmodium canadense (Canadian tick-trefoil)

Dichanthelium acuminatum (hairy panic grass)

Dichanthelium wilcoxianum (Wilcox’s panic grass)

Doellingeria umbellata (flat-topped aster)

Drymocallis arguta (tall cinquefoil)

Echinacea angustifolia (narrow-leaved purple coneflower)

Elymus repens (quackgrass)

Elymus trachycaulus ssp. subsecundus (bearded wheatgrass)

Elymus trachycaulus ssp. trachycaulus (slender wheatgrass)

Equisetum fluviatile (water horsetail)

Equisetum hyemale var. affine (scouring rush horsetail)

Euthamia graminifolia var. graminifolia (grass-leaved goldenrod)

Eutrochium maculatum (spotted Joe Pye weed)

Fragaria virginiana (common strawberry)

Gentiana andrewsii (bottle gentian)

Gentianopsis virgata ssp. virgata (lesser fringed gentian)

Glycyrrhiza lepidota (wild licorice)

Grimmia laevigata (grimmia dry rock moss)

Helenium autumnale (common sneezeweed)

Helianthus giganteus (giant sunflower)

Helianthus maximilianii (Maximilian’s sunflower)

Helianthus pauciflorus ssp. subrhomboideus (stiff sunflower)

Hesperostipa comata ssp. comata (needle-and-thread)

Hesperostipa spartea (porcupine grass)

Heterotheca villosa (hairy false goldenaster)

Heuchera richardsonii (prairie alumroot)

Juncus balticus var. littoralis (Baltic rush)

Juncus torreyi (Torrey’s rush)

Koeleria macrantha (June grass)

Liatris aspera (rough blazing star)

Liatris ligulistylis (northern plains blazing star)

Liatris punctata var. punctata (dotted blazing star)

Liatris pycnostachya var. pycnostachya (prairie blazing star)

Linum sulcatum var. sulcatum (grooved yellow flax)

Lithospermum occidentale (western marbleseed)

Lobelia kalmii (brook lobelia)

Lotus corniculatus var. corniculatus (bird’s-foot trefoil)

Lycopus americanus (American bugleweed)

Lysimachia quadriflora (four-flowered yellow loosestrife)

Medicago sativa ssp. sativa (alfalfa)

Melilotus albus (white sweet clover)

Muhlenbergia cuspidata (plains muhly)

Muhlenbergia glomerata (spiked muhly)

Nabalus albus (white rattlesnake root)

Oenothera biennis (common evening primrose)

Oenothera serrulata (toothed evening primrose)

Oligoneuron riddellii (Riddell’s goldenrod)

Packera aurea (golden ragwort)

Packera cana (woolly groundsel)

Packera pseudaurea var. semicordata (falsegold groundsel)

Parthenocissus vitacea (woodbine)

Pedicularis lanceolata (swamp betony)

Phragmites australis ssp. americanus (North American common reed)

Poa pratensis ssp. pratensis (Kentucky bluegrass)

Populus deltoides ssp. molinifera (plains cottonwood)

Populus tremuloides (quaking aspen)

Potentilla hippiana (woolly cinquefoil)

Potentilla pensylvanica (Pennsylvania cinquefoil)

Potentilla recta (rough-fruited cinquefoil)

Prunus pumila (sand cherry)

Prunus virginiana var. virginiana (chokecherry)

Pycnanthemum virginianum (Virginia mountain mint)

Ratibida columnifera (long-headed coneflower)

Rhus glabra (smooth sumac)

Rosa arkansana (prairie rose)

Rudbeckia hirta var. pulcherrima (black-eyed Susan)

Salix amygdaloides (peachleaf willow)

Salix bebbiana (Bebb’s willow)

Salix candida (sage-leaved willow)

Salix discolor (pussy willow)

Salix humilis (prairie willow)

Salix interior (sandbar willow)

Salix petiolaris (slender willow)

Schizachyrium scoparium var. scoparium (little bluestem)

Scirpus atrovirens (dark green bulrush)

Securigera varia (crown vetch)

Silene csereii (Balkan catchfly)

Sisyrinchium sp. (blue-eyed grass)

Solidago altissima ssp. gilvocanescens (shorthair goldenrod)

Solidago gigantea (giant goldenrod)

Solidago nemoralis (gray goldenrod)

Solidago ptarmicoides (prairie goldenrod)

Solidago rigida ssp. rigida (stiff goldenrod)

Sonchus arvensis (field sow thistle)

Sorghastrum nutans (Indiangrass)

Spartina pectinata (prairie cordgrass)

Sphenopholis obtusata (prairie wedge grass)

Sporobolus heterolepis (prairie dropseed)

Symphoricarpos occidentalis (wolfberry)

Symphyotrichum boreale (northern bog aster)

Symphyotrichum ericoides var. ericoides (white heath aster)

Symphyotrichum lanceolatum (white panicled aster)

Symphyotrichum novae-angliae (New England aster)

Symphyotrichum puniceum var. puniceum (purple-stem aster)

Symphyotrichum sericeum (silky aster)

Syringa vulgaris (common lilac)

Thalictrum dasycarpum (tall meadow rue)

Triantha glutinosa (sticky false asphodel)

Trifolium pratense (red clover)

Triglochin maritima (seaside arrowgrass)

Triglochin palustris (marsh arrow-grass)

Typha × glauca (hybrid cattail)

Typha angustifolia (narrow-leaved cattail)

Typha latifolia (broad-leaved cattail)

Ulmus pumila (Siberian elm)

Verbascum thapsus ssp. thapsus (common mullein)

Zizia aurea (golden alexanders)

alfalfa

asparagus

bird’s-foot trefoil

black-eyed susan

bottle gentian

Canada anemone

Canadian tick-trefoil

common evening primrose

common sneezeweed

crown vetch

dotted blazing star

four-flowered yellow loosestrife

golden alexanders

green milkweed

hairy false goldenaster

harebell

leadplant

long-headed coneflower

Maximilian’s sunflower

narrow-leaved purple coneflower

New England aster

plumeless thistle

poke milkweed

prairie blazing star

prairie onion

purple prairie clover

red clover

rough-fruited cinquefoil

shrubby cinquefoil

silky aster

small white lady’s slipper

spotted Joe Pye weed

spotted water hemlock

stiff sunflower (ssp. subrhomboideus)

swamp milkweed

swamp thistle

tall cinquefoil

Virginia mountain mint

wild licorice


 

 

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