Soil and Flood Maps of the Lower St. Mary's River

Alluvial Soils

     

USA Soils Map Units

USA Soils Map Units

Alfisols

Andisols

Aridisols

Entisols

Gelisols

Histosols

Inceptisols

Mollisols

Oxisols

Spodosols

Ultisols

Vertisols

Bodies of Water

No Soil

The Lower St. Mary's Watershed is characterized by the Entisols and Histosols that have collected along the river bed. The mucky marshlands are a major coastal habitat fed by parent soils upstream. Another common habitat in the watershed is coastal conifer forests. Spodosols commonly support forests in humid climates which matches this region. 

FEMA Flood Plain

FEMA AE flood zone is the base flood plain. Green and blue regions are subject to inundation from a 1% annual chance flood event. Large portions of the populated downtown district lie within this base flood plain and experience flooding events. Frequent inundation provides unique habitats called salt flats or marshland. Fish, invertebrates, and birds rely on the safety provided by marshland for breeding and raising young.