Wetlands by Broad Land Cover/Use, by State, 1997
Description
This pie map contains a pie chart for each state
and the nation. The pie slices reflect acres of
wetlands in various land cover/use categories as
a percent of the total area of wetlands. The
size of the pies is proportional to the amount
of wetlands in the state (scaled between New
Mexico with 40,500 acres at .1 inch and
Minnesota with 10,863,800 acres at .7 inch).
Wetlands data are not collected on Federal
land. There were 111,156,000 acres of Wetlands
in 1997.
Cautions for this Product:
Wetlands do not include deepwater habitats. The
1% of wetlands on developed land (urban areas
and rural transportation land) are not
incorporated into the pies. The pies also do
not include any wetlands located on Federal
land. The national pie is not proportional to
the state pies.
Sources
Source:
National Resources Inventory, 1997
Distributor:
USDA-NRCS-RIAD
Reliability:
NRI sample data are generally reliable at the
95% confidence interval for state and certain
broad substate area analyses. Generally,
analyses that aggregate data points by smaller
geographic areas and/or more specific criteria
result in fewer data points for each aggregation
and therefore less reliable estimates. NRI maps
reflect national patterns rather than site-
specific information.
Layers
Aggregate Layer:
State
Other Layers Displayed:
Definitions
Cropland:
A Land cover/use category that includes areas
used for the production of adapted crops for
harvest. Two subcategories of cropland are
recognized: cultivated and noncultivated.
Cultivated cropland comprises land in row crops
or close-grown crops and also other cultivated
cropland, for example, hayland or pastureland
that is in a rotation with row or close-grown
crops. Noncultivated cropland includes permanent
hayland and horticultural cropland. [NRI-97]
Deepwater habitat:
Any open water area in which the mean water
depth exceeds 6.6 feet in nontidal areas or at
mean low water in freshwater tidal areas, or is
covered by water during extreme low water at
spring tides in salt and brackish tidal areas,
or covers the deepest emerging vegetation,
whichever is deeper [USFWS]
Forest land:
A Land Cover/Use that is at least 10 percent
stocked by single stemmed forest trees of any
size which will be at least 4 meters (13 feet)
tall at maturity. When viewed vertically,
canopy cover is 25 percent or greater. Also
included are areas bearing evidence of natural
regeneration of tree cover (cutover forest or
abandoned farmland) and not currently developed
for nonforest use. For classification as forest
land, an area must be at least one acre and 100
feet wide. [NRI-97]
Marshland:
A sub-category of the Land Cover/Use category
Other Rural Land described as a nonforested area
of land partially or intermittently covered with
water usually characterized by the presence of
monocotyledons, such as sedges and rushes.
These areas are usually in a wetland class and
are not placed in another NRI land cover/use
category such as rangeland or pastureland. [NRI-
97]
Other rural land:
A Land cover/use category that includes
farmsteads and other farm structures, field
windbreaks, barren land, and marshland. [Revised
1992 NRI Summary Report, omitting CRP land.]
Pastureland and Native Pasture:
A Land Cover/Use category of land managed
primarily for the production of introduced or
native forage plants for livestock grazing.
Pastureland may consist of a single species in a
pure stand, a grass mixture or a grass-legume
mixture. Management usually consists of
cultural treatments-fertilization, weed control,
reseeding, or renovation and control of
grazing. (For the NRI, includes land that has a
vegetative cover of grasses, legumes, and/or
forbs, regardless of whether or not it is being
grazed by livestock.) [NRI-97]
Rangeland:
A Land cover/use category on which the climax or
potential plant cover is composed principally of
native grasses, grasslike plants, forbs or
shrubs suitable for grazing and browsing, and
introduced forage species that are managed like
rangeland. This would include areas where
introduced hardy and persistent grasses, such as
crested wheatgrass, are planted and such
practices as deferred grazing, burning,
chaining, and rotational grazing are used, with
little or no chemicals or fertilizer being
applied. Grasslands, savannas,
many wetlands, some deserts, and tundra are
considered to be rangeland. Certain communities
of low forbs and shrubs, such as mesquite,
chaparral, mountain shrub, and pinyon-juniper,
are also included as rangeland.
[NRI-97]
Water body:
A type of (permanent open) water area which
includes ponds, lakes, reservoirs, bays or
gulfs, and estuaries. There are 3 size
categories: (1) less than 2 acres; (ii) 2-40
acres; and (iii) at least 40 acres. [NRI-97]
Wetland:
Areas that have a predominance of hydric soils
and that are inundated or saturated by surface
or ground water at a frequency and duration
sufficient to support, and under normal
circumstances do support, a prevalence of
hydrophytic vegetation typically adapted for
life in saturated soil conditions. [NFSAM]
Wetland System:
Complex of wetland habitats that share the
influence of similar hydrologic, geomorphologic,
chemical, or biological factors. [U.S. FWS]
Product Information
Product ID:
5026
Production Date:
5/4/01
Product Type:
Map
For additional information
contact the Resources Inventory and Assessment Division.
Please include the Product ID you are inquiring about.
nri@wdc.usda.gov
or 1400 Independence Avenue SW - P.O. Box 2890 -
Washington D.C. 20013. If you use our analysis products,
please be aware of our disclaimer.
| 
About Us
Back to Top