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Conservation Service

Ecological site F098XA017MI

Moist Acidic Drift Flats

Last updated: 1/12/2024
Accessed: 08/22/2026

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General information

Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.

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Figure 1. Mapped extent

Areas shown in blue indicate the maximum mapped extent of this ecological site. Other ecological sites likely occur within the highlighted areas. It is also possible for this ecological site to occur outside of highlighted areas if detailed soil survey has not been completed or recently updated.

MLRA notes

Major Land Resource Area (MLRA): 098X–Southern Michigan and Northern Indiana Drift Plains

"This area is in the Eastern Lake Section of the Central Lowland Province of the Interior Plains. It is a broad glaciated plain that is deeply mantled by till in the north and outwash to the south. Much of the area is nearly level to gently rolling. Elevation ranges from 183 to 391 m (600 to 1285 ft). Local topographic relief averages 9 m and ranges up to 74 m (30 to 245 ft). Highest relief occurs adjacent to river valleys eroded through moraines. Topography is more subdued south of the Atlantic/Gulf drainage divide near the Michigan/Indiana state line, elevations ranging from 185 to 280 m (605 to 920 ft). Local topographic relief in the south averages 4 m and ranges up to 49 m (10 to 160 ft).

The surface of this area is covered by 30 to 150 m (100 to 500 ft) of glacial drift in most areas. At the northern edge of the area, the drift is more than 100 meters (300 ft) thick. From the Grand River basin northward, most of the drift consists of till from the Saginaw Lobe of the Wisconsin Ice Sheet. From the Kalamazoo River basin southward, there are significant deposits of unconsolidated sand and gravel outwash formed between major lobes of the receding Wisconsin Ice Sheet. The outwash deposits are reworked as sand dunes in the Kankakee River basin.

The bedrock beneath the glacial deposits in this area is deformed in the shape of a basin. The center of this basin is in the north-central part of the area. Pennsylvanian-age sandstone are in the center of the basin, and Mississippian-age sandstone and shale beds form the outer rings of the basin. In a few areas the drift deposits are less than 2 m (6 ft) thick, where glacial outwash channels have eroded to limestone bedrock in Grand Rapids, and where sandstone bedrock cuestas peak in elevation in near Hillsdale, Michigan. A sandstone cliff < 15 m high (<50 ft) occurs along a short stretch of the Grand River in Grand Ledge, Michigan.

Most of the rivers in this area are short because of their proximity to the Great Lakes east and west of the area. The largest watersheds, the St. Joseph River, Grand River, and Kalamazoo River drain into Lake Michigan. The southern extent of the MLRA is drained by the Kankakee River of the Mississippi River watershed."

Classification relationships

Among the USFS ecoregional framework (Cleland et al., 2007), most of MLRA 98 is represented by the Humid Temperate Domain (200), Hot Continental Division (220), Midwest Broadleaf Forest Province (222), South Central Great Lakes Section (222J), subsections 222Jc, 222Jg, 222Jh, and 222Jf. Similar sites within the portion of MLRA 98 that overlap the Prairie Division (250) and Prairie Parkland Province
(251) are treated as separate ecological sites. MLRA 98 recently was adjusted to exclude portions of Warm Continental Division (210), Laurentian Mixed Forest Province (212) to the north, and subsections 222Ja and 222Jb to the northwest.

Ecological site concept

The central concept of the Moist Acidic Drift Flats is deep sands (>70% sands >100 cm deep) with low base saturation (pHs <5.5 and/or Spodosols) and high seasonal water tables intermediate in wetness between wetland and uplands (somewhat poorly drained to moderately well drained). Such sites support vegetation composed of both upland and wetland species which tolerate low nutrient conditions. Late successional forest dominates the area, but small areas of barrens and grasslands do occur. Characteristic species include red maple (Acer rubrum), red oak (Quercus rubra), black gum (Nyssa sylvatica) in forested sites with ferns and heaths (Ericaceae) in the understory. Open sites tend to have various warm season grasses, sedges, and rushes and scattered oak.

Associated sites

F098XA018MI	Wet Acidic Drift Depressions
F098XA020MI	Wet Sandy Drift Depressions

F098XA018MI

Wet Acidic Drift Depressions

F098XA020MI

Wet Sandy Drift Depressions

Similar sites

F098XA019MI	Moist Sandy Drift Plains
F098XB031IN	Kankakee Acidic Interdunes
F097XA006MI	Moist Acidic Sandy Flatwoods May be similar enough to merge site concepts across MLRA boundaries. Limited in extent within MLRA 98, but widespread in MLRA 97. Most occurrences near enough to MLRA 97 such that floristic differences are unlikely to be significant.

F098XA019MI

Moist Sandy Drift Plains

F098XB031IN

Kankakee Acidic Interdunes

F097XA006MI

Moist Acidic Sandy Flatwoods

May be similar enough to merge site concepts across MLRA boundaries. Limited in extent within MLRA 98, but widespread in MLRA 97. Most occurrences near enough to MLRA 97 such that floristic differences are unlikely to be significant.

Table 1. Dominant plant species

Tree	(1) Acer rubrum (2) Quercus rubra
Shrub	Not specified
Herbaceous	(1) Pteridium aquilinum

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Physiographic features

Site is most commonly found on flats on outwash plains.

Table 2. Representative physiographic features

Landforms	(1) Flat (2) Outwash plain
Runoff class	Negligible to low
Ponding duration	Very brief (4 to 48 hours)
Ponding frequency	None to occasional
Elevation	604 – 1276 ft
Water table depth	10 – 39 in
Aspect	Aspect is not a significant factor

Climatic features

This ecological site experiences a humid continental climate with mild summers and cold winters. Precipitation is moderately well distributed through the year with higher amounts during the growing season than the winter. Temperature extremes are moderated by the Great Lakes compared to other inland continental locations, though not as much as MLRAs directly bordering the Great Lakes. Mean annual extreme minimum temperatures range from -26.6 to -20.8°C (-16 to -5°F), which falls within hardiness zones 5a to 6a. Annual snowfall is enhanced by the Great Lakes, mainly on the western half of the MLRA.

Table 3 Representative climatic features

Frost-free period (characteristic range)	120-130 days
Freeze-free period (characteristic range)	150-170 days
Precipitation total (characteristic range)	30-40 in
Frost-free period (actual range)	120-140 days
Freeze-free period (actual range)	150-170 days
Precipitation total (actual range)	30-40 in
Frost-free period (average)	130 days
Freeze-free period (average)	160 days
Precipitation total (average)	40 in

Characteristic range

Actual range

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Figure 2. Monthly precipitation range

Characteristic range

Actual range

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Figure 3. Monthly minimum temperature range

Characteristic range

Actual range

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Figure 4. Monthly maximum temperature range

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Figure 5. Monthly average minimum and maximum temperature

Figure 6. Annual precipitation pattern

Figure 7 Annual average temperature pattern

Climate stations used

(1) PRAIRIE HEIGHTS [USC00127102], LaGrange, IN
(2) WANATAH 2 WNW [USC00129222], Valparaiso, IN
(3) DOWAGIAC 1 W [USC00202250], Dowagiac, MI
(4) FLINT 7 W [USC00202851], Flushing, MI
(5) GREENVILLE 2 NNE [USC00203429], Greenville, MI
(6) SAINT JOHNS [USC00207280], Saint Johns, MI
(7) LAPORTE [USC00124837], La Porte, IN
(8) CHARLOTTE [USC00201476], Roscommon, MI
(9) THREE RIVERS [USC00208184], Three Rivers, MI
(10) BATTLE CREEK KELLOGG AP [USW00014815], Battle Creek, MI
(11) FLINT BISHOP INTL AP [USW00014826], Flint, MI
(12) COLDWATER ST SCHOOL [USC00201675], Coldwater, MI
(13) GULL LK BIOLOGICAL STN [USC00203504], Augusta, MI
(14) HASTINGS [USC00203661], Hastings, MI
(15) HILLSDALE [USC00203823], Hillsdale, MI
(16) ALMA [USC00200146], Alma, MI
(17) EAST LANSING 4 S [USC00202395], Holt, MI
(18) HOWELL WWTP [USC00203947], Howell, MI
(19) IONIA 2SSW [USC00204078], Ionia, MI
(20) OWOSSO WWTP [USC00206300], Owosso, MI
(21) LANSING CAPITAL CITY AP [USW00014836], Lansing, MI
(22) GRAND RAPIDS [USW00094860], Grand Rapids, MI

Soil features

Soils are somewhat poorly drained sands and loams with low pH. They are commonly classified as Typic Endoaquods, Aquultic Hapludalfs, and Aquic Udipsamments, and commonly mapped as Pipestone, Bourbon, and Morocco series.

Table 4. Representative soil features

Parent material	(1) Glaciofluvial deposits
Surface texture	(1) Sand
Drainage class	Somewhat poorly drained to moderately well drained
Permeability class	Moderately rapid to rapid
Soil depth	79 – 0 in
Surface fragment cover <=3"	0 – 1 %
Surface fragment cover >3"	Not specified
Available water capacity (0-39.4in)	1.57 – 3.94 in
Soil reaction (1:1 water) (0-19.7in)	3.5 – 5.5
Subsurface fragment volume <=3" (0-59.1in)	0 – 5 %
Subsurface fragment volume >3" (0-59.1in)	0 – 1 %

Ecological dynamics

Fire was locally important adjacent to other fire prone ecological sites. Windthrow is a frequent disturbance due to shallow rooting in soils with high water table. The acidic low nutrient status in combination with seasonality of ponding favors red maple, pin oak, and black gum swamps and wet meadows and marshes containing an assortment of coastal plain disjuncts. The reference community is dominated by red maple (Acer rubrum) and red oak (Quercus rubra) and an understory of bracken fern (Pteridium aquilinum).

State and transition model

More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective text

State 1
Reference State

The Reference State consists of red maple-oak forests and woodlands.

Dominant plant species

red maple (Acer rubrum), tree
northern red oak (Quercus rubra), tree
western brackenfern (Pteridium aquilinum), other herbaceous

Community 1.1
Dry-mesophytic Forest

Community 1.2
Wooded Grassland

Community 1.3
Native Ruderal Forest

Community 1.4
Regenerating Forest

Community 1.5
Mesophytic Forest

Pathway 1.1A
Community 1.1 to 1.2

Blowdown; increased fire/drought.

Conservation practices

Prescribed Burning
Early Successional Habitat Development/Management
Forest Stand Improvement

Pathway 1.1B
Community 1.1 to 1.3

Blowdown/clearcut

Conservation practices

Early Successional Habitat Development/Management
Forest Stand Improvement

Pathway 1.1C
Community 1.1 to 1.4

Blowdown/clearcut

Conservation practices

Forest Stand Improvement

Pathway 1.1D
Community 1.1 to 1.5

Succession; decreased fire/drought

Pathway 1.2A
Community 1.2 to 1.1

Succession

Pathway 1.2B
Community 1.2 to 1.3

Decreased fire/drought; succession

Pathway 1.3A
Community 1.3 to 1.1

Succession

Pathway 1.3B
Community 1.3 to 1.2

Blowdown; increased fire/drought.

Pathway 1.3C
Community 1.3 to 1.5

Succession; decreased fire/drought.

Pathway 1.4A
Community 1.4 to 1.1

Succession.

Pathway 1.4B
Community 1.4 to 1.2

Blowdown; increased fire/drought.

Pathway 1.4C
Community 1.4 to 1.5

Succession; decreased fire/drought.

Pathway 1.5A
Community 1.5 to 1.1

Increased fire/drought with mortality.

Conservation practices

Prescribed Burning
Forest Stand Improvement

Pathway 1.5B
Community 1.5 to 1.3

Blowdown/clearcut.

Conservation practices

Early Successional Habitat Development/Management
Forest Stand Improvement

Pathway 1.5C
Community 1.5 to 1.4

Blowdown/clearcut

Conservation practices

Forest Stand Improvement

State 2
Cultural State

[Alternative States to be developed; refer to component communities.]

Community 2.1
Sustainable Crop, Pasture, or Plantation

Community 2.2
Unsustainable Crop, Pasture, or Plantation

Community 2.3
Conservation Feature

Can be a grassed waterway, conservation reserve, a small patch pollinator garden, or other land taken out of its primary cultural production to mitigate or reduce impacts of adjacent land use, and is not by itself a permanent restoration of a complete native biological community and associated ecosystem services.

Pathway 2.1A
Community 2.1 to 2.2

Revert to unsustainable cultural practices.

Pathway 2.1B
Community 2.1 to 2.3

Establish conservation feature.

Conservation practices

Conservation Cover
Grassed Waterway

Pathway 2.2A
Community 2.2 to 2.1

Implement sustainable cultural practices.

Conservation practices

Conservation Crop Rotation
Cover Crop
Nutrient Management
Integrated Pest Management (IPM)

Pathway 2.2B
Community 2.2 to 2.3

Establish conservation feature.

Conservation practices

Conservation Cover
Grassed Waterway

Pathway 2.3A
Community 2.3 to 2.1

Implement sustainable cultural practices.

Conservation practices

Conservation Cover
Conservation Crop Rotation
Nutrient Management
Integrated Pest Management (IPM)

Pathway 2.3B
Community 2.3 to 2.2

Revert to unsustainable cultural practices.

State 3
Seminatural State

[Alternative States to be developed; refer to component communities.]

Community 3.1
Ruderal Meadow & Shrubland

Community 3.2
Exotic Ruderal Forest

Pathway 3.1A
Community 3.1 to 3.2

Succession.

Pathway 3.2A
Community 3.2 to 3.1

Blowdown/clearcut.

Transition T1A
State 1 to 2

Clear vegetation; cultivate domesticated species

Transition T1B
State 1 to 3

Clear vegetation, invasive species introduced

Restoration pathway R2
State 2 to 1

Remove domesticated species; restore native species.

Conservation practices

Brush Management
Tree/Shrub Site Preparation
Tree/Shrub Establishment
Restoration and Management of Rare and Declining Habitats
Upland Wildlife Habitat Management
Herbaceous Weed Control

Transition T2A
State 2 to 3

Abandoned, succession.

Restoration pathway R3
State 3 to 1

Control invasive species; restore native species

Conservation practices

Brush Management
Tree/Shrub Site Preparation
Tree/Shrub Establishment
Restoration and Management of Rare and Declining Habitats
Upland Wildlife Habitat Management
Herbaceous Weed Control

Restoration pathway T3A
State 3 to 2

Clear vegetation; cultivate domesticated species

Additional community tables

Table 5. Community 1.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 6. Community 1.2 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 7. Community 1.3 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 8. Community 1.4 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 9. Community 1.5 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 10. Community 2.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 11. Community 2.2 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 12. Community 2.3 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 13. Community 3.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 14. Community 3.2 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Supporting information

Inventory data references

Site Development and Testing Plan Future work is needed, as described in a future project plan, to validate the information presented in this provisional ecological site description. Future work includes field sampling, data collection and analysis by qualified vegetation ecologists and soil scientists. As warranted, annual reviews of the project plan can be conducted by the Ecological Site Technical Team. A final field review, peer review, quality control, and quality assurance reviews of the ESD are necessary to approve a final document.

Other references

Albert, D. A. et al., 1995. Vegetation circa 1800 of Michigan. Michigan's native landscape as interpreted from the General Land Office Surveys 1816-1856 (digital map), Lansing: Michigan Natural Features Inventory.

Barnes, B. V. and Wagner, W. H., 2004. Michigan trees: a guide to the trees of the Great Lakes region. Ann Arbor (Michigan): University of Michigan Press.

Burger, T. L. and Kotar, J., 2003. A Guide to Forest Communities and Habitat Types of Michigan. Madison, Wisconsin: Department of Forest Ecology and Management, University of Wisconsin.

Cleland, D. T. et al., 1994. Field guide: Ecological classification and inventory system of the Huron-Manistee National Forests, s.l.: USDA Forest Service, North Central Forest Experiment Station.

Cleland, D.T., J.A. Freeouf, J.E. Keys, G.J. Nowacki, C. Carpenter, and W.H. McNab. 2007. Ecological Subregions: Sections and Subsections of the Coterminous United States. USDA Forest Service, General Technical Report WO-76. Washington, DC. 1–92.

Jacquart, E., Homoya, M. and Casebere, L., 2002. Natural Communities of Indiana (Working Draft), Indianapolis: Indiana Department of Natural Resources, Division of Nature Preserves.

Kost, M. A. et al., 2010. Natural Communities of Michigan: Classification and Description, Lansing, MI: Michigan Natural Features Inventory.

Moran, R. C., 1981. Prairie fens in northeastern Illinois: floristic composition and disturbance. Ohio Biol Surv Biol Notes, 15, 164-168.

Omernik, J.M. and G.E. Griffith. 2014. Ecoregions of the Conterminous United States: Evolution of a Hierarchical Spatial Framework. Environmental Management 54:1249–1266.

Swink, F. and Wilhelm, G., 1994. Plants of the Chicago Region. Indianapolis(Indiana): Indiana Academy of Science.

U.S. Department of the Interior, Geological Survey, 2008. LANDFIRE: LANDFIRE 1.1.0 Vegetation Dynamics Models. Accessed August 28, 2012 http://landfire.cr.usgs.gov/viewer/.

U.S. Department of the Interior, Geological Survey, 2011. LANDFIRE: LANDFIRE 1.1.0 Existing Vegetation Type layer. http://landfire.cr.usgs.gov/viewer/

Contributors

Greg Schmidt

Approval

Nels Barrett, 1/12/2024

Acknowledgments

Matt Bromley and Andy Henriksen reviewed the narratives. Matt Bromley reviewed associated soil map units.

Rangeland health reference sheet

Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.

Author(s)/participant(s)
Contact for lead author
Date	08/22/2026
Approved by
Approval date
Composition (Indicators 10 and 12) based on	Annual Production

Indicators

Number and extent of rills:
Presence of water flow patterns:
Number and height of erosional pedestals or terracettes:
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Number of gullies and erosion associated with gullies:
Extent of wind scoured, blowouts and/or depositional areas:
Amount of litter movement (describe size and distance expected to travel):
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):

Dominant:

Sub-dominant:

Other:

Additional:
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Average percent litter cover (%) and depth ( in):
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:
Perennial plant reproductive capability:

Download reference sheet

Natural ResourcesConservation Service

Ecological site F098XA017MI

Moist Acidic Drift Flats

Last updated: 1/12/2024 Accessed: 08/22/2026

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General information

Figure 1. Mapped extent

MLRA notes

Classification relationships

Ecological site concept

Associated sites

Similar sites

Table 1. Dominant plant species

Natural Resources
Conservation Service

Last updated: 1/12/2024
Accessed: 08/22/2026