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Wetland Resources of Eastern South Dakota

Results and Discussion


Lacustrine Wetlands and Deepwater Habitats

System and Subsystems
Wetlands and deepwater habitats in the lacustrine system, including both natural lakes and lacustrine impoundments, cover 371,982 ac (150,538 ha) of eastern South Dakota (Table 2). Lacustrine wetlands are assigned to limnetic or littoral subsystems. Lacustrine wetlands in the limnetic subsystem (limnetic lacustrine wetlands with semipermanent and intermittently exposed water regimes) comprise 49,730 ac (20,125 ha) or 13.4% of total lacustrine habitat delineated by the NWI. All deepwater habitats in South Dakota are permanently flooded lacustrine sites in the unconsolidated bottom class, and they cover 201,841 ac (81,684 ha) or 54.3% of total lacustrine habitat. Lacustrine wetlands in the littoral subsystem comprise 120,412 ac (48,730 ha) or 32.4% of total lacustrine wetland area.

Classes
All limnetic lacustrine habitat in eastern South Dakota is classified in the unconsolidated bottom class. Of the total area of littoral lacustrine wetlands, 114,528 ac (46,349 ha) or 94.9% are in the aquatic bed class, 2,501 ac (1,012 ha) or 2.5% are in the unconsolidated bottom class, and 3,353 ac (1,357 ha) or 2.6% are in the unconsolidated shoreline class (beaches).

Water Regimes
Most eastern South Dakota lacustrine habitats have permanent or intermittently exposed water regimes. Permanent lacustrine habitat covers 201,841 ac (81,684 ha) or 54.3% of total lacustrine habitat. Intermittently exposed lacustrine wetlands cover 152,481 ac (61,708 ha) or 41.0% of total lacustrine habitat. Semipermanent lacustrine wetlands, which are all in the littoral subsystem in eastern South Dakota, cover 14,361 ac (5,812 ha) or 3.9% of total lacustrine habitat area (Fig. 14). Temporary lacustrine wetlands, which are all beaches adjacent to lakes and impoundments, cover 870 ac (352 ha) of eastern South Dakota. Seasonal lacustrine wetlands, also shorelines, cover 2,501 ac (1,012 ha). Temporary and seasonal lacustrine wetlands each comprise <1% of the total area.

GIF - Percentage of Lacustrine Wetlands by Water Regime
Figure 14. Percent of total acres of eastern South Dakota lacustrine wetlands by water regime. Temporary and seasonal wetlands comprise a trace of total lacustrine wetland area.

Special Modifiers
Created lacustrine wetlands and deepwater habitats cover 226,107 ac (91,504 ha) or 60.8% of total lacustrine wetland area in eastern South Dakota (Fig. 15). Of the total area of created lacustrine wetlands, 224,745 ac (90,953 ha) or 99.4% are artificial impoundments and 1,362 ac (551 ha) or 0.6%, are excavated.

GIF - Percentage of Lacustrine Wetlands by Special Modifier
Figure 15. Percent of total acres of eastern South Dakota lacustrine wetlands by special modifier.

Created lacustrine wetlands and deepwater habitats are most abundant in counties bordering Missouri River. The five counties with the greatest area of lacustrine impoundments, ranked in order of decreasing abundance, are Hughes (14,969 ac or 6,058 ha), Sully (14,425 ac or 5,838 ha), Charles Mix (10,549 ac or 4,269 ha), Campbell (8,401 ac or 3,400 ha), and Potter (7,644 ac or 3,093 ha) (Appendix B).

Natural lacustrine wetlands and deepwater habitats make up 145,875 ac (59,034 ha) or 39.2% of total lacustrine habitat area (Fig. 15). A total 534 ac (216 ha) of natural lacustrine wetlands are partially drained.

Natural lacustrine wetlands and deepwater habitats are most abundant in counties in the northern and north-central Prairie Coteau and in Roberts County, which contains part of Big Stone Lake. The five counties with the greatest area of natural lacustrine wetlands and deepwater habitats, ranked in order of decreasing abundance, are Day (8,550 ac or 3,460 ha), Hamlin (6,567 ac or 2,658 ha), Marshall (6,118 ac or 2,476 ha), Codington (6,006 ac or 2,431 ha), and Kingsbury (4,307 ac or 1,743 ha) (Appendix B).


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