2010 National Resources Inventory

The National Resources Inventory (NRI) is a statistical survey of natural resource conditions and trends on non-Federal land in the United States. Non-Federal lands include privately owned lands, tribal and trust lands, and lands controlled by state and local governments.


National Land Use

 

Total Surface Area, by Land Cover/Use
In thousands of acres, with margins of error
Land Cover/Use 1982 1987 1992 1997 2002 2007 2010
Federal land 399,494.3
--
399,898.9
--
402,000.6
--
402,140.8
--
402,392.5
--
402,392.0
--
402,392.0
--
Water areas 48,719.3
--
49,931.2
--
49,504.7
--
49,989.8
--
50,486.2
--
50,855.5
--
50,971.5
--
Non-Federal Land Developed 71,908.0
± 753.4
77,932.5
± 830.7
85,137.4
± 950.1
95,933.7
± 996.7
104,940.2
± 1,212.7
111,061.1
± 1,264.0
113,341.6
± 1,283.3
Rural 1,424,008.1
± 799.4
1,416,367.1
± 871.6
1,407,487.0
± 973.4
1,396,065.4
± 1,034.6
1,386,310.8
± 1,253.8
1,379,821.1
± 1,367.7
1,377,424.6
± 1,382.9
Total 1,495,916.1
± 172.4
1,494,299.6
± 169.6
1,492,624.4
± 166.1
1,491,999.1
± 165.3
1,491,251.0
± 237.7
1,490,882.2
± 472.4
1,490,766.2
± 463.5
Total surface area 1,944,129.7
--
1,944,129.7
--
1,944,129.7
--
1,944,129.7
--
1,944,129.7
--
1,944,129.7
--
1,944,129.7
--
Total Surface Area pie chart, see the Total Surface Area, by Land Cover/Use table for data values
Notes:
• Acreages for Federal land, water areas, and total surface area are established through geospatial processes and administrative records; therefore, statistical margins of error are not applicable and shown as a dashed line (--).

Non-Federal Rural Land, by Land Cover/Use
In thousands of acres, with margins of error
Land Cover/Use 1982 1987 1992 1997 2002 2007 2010
Cropland 420,226.9
± 2,069.5
406,056.7
± 1,987.0
381,948.2
± 1,963.9
376,616.3
± 2,048.5
367,917.5
± 2,100.8
358,988.2
± 2,357.6
360,892.2
± 2,088.7
CRP Land --
13,730.4
--
34,091.1
--
32,694.9
--
31,850.2
--
32,327.6
--
26,610.1
--
Pastureland 131,533.3
± 1,372.0
127,374.0
± 1,353.4
125,526.6
± 1,258.2
120,058.0
± 1,289.7
118,432.9
± 1,719.2
119,602.7
± 1,654.6
120,449.9
± 1,603.4
Rangeland 419,127.0
± 3,332.1
413,977.7
± 3,345.8
410,313.0
± 3,241.9
408,915.8
± 3,358.0
409,185.0
± 3,391.2
409,231.1
± 3,844.5
409,092.7
± 3,691.3
Forest Land 405,390.8
± 2,606.2
407,260.6
± 2,789.3
407,144.3
± 2,821.0
408,572.6
± 2,872.5
409,418.1
± 2,657.3
408,926.5
± 2,965.6
408,991.3
± 3,001.1
Other Rural Land 47,730.1
± 1,402.2
47,967.7
± 1,463.3
48,463.8
± 1,367.3
49,207.8
± 1,334.6
49,507.1
± 1,252.9
50,745.0
± 1,453.6
51,388.4
± 1,460.7
Total Non-Federal Rural Land 1,424,008.1
± 799.4
1,416,367.1
± 871.6
1,407,487.0
± 973.4
1,396,065.4
± 1,034.6
1,386,310.8
± 1,253.8
1,379,821.1
± 1,367.7
1,377,424.6
± 1,382.9
Selected Land Cover/uses chart, see the Total Surface Area, by Land Cover/Use for data values
Notes:
• Acreages for Conservation Reserve Program (CRP) land are established through geospatial processes and administrative records; therefore, statistical margins of error are not applicable and shown as a dashed line (--). CRP was not implemented until 1985.
• Cropland includes cultivated and noncultivated cropland.

Prime Farmland, by Land Cover/Use
In thousands of acres, with margins of error
Land Cover/Use 1982 1987 1992 1997 2002 2007 2010
Cropland 227,682.6
± 1,643.3
223,135.9
± 1,520.1
213,996.5
± 1,371.2
210,790.3
± 1,426.6
206,558.1
± 1,214.7
201,888.5
± 1,804.4
201,864.2
± 1,687.8
CRP Land --
3,299.4
± 186.7
9,674.6
± 287.2
9,234.6
± 254.3
8,457.8
± 395.5
8,414.1
± 532.3
6,785.7
± 478.3
Pastureland 35,177.7
± 778.9
34,689.5
± 651.7
34,888.1
± 652.2
33,844.5
± 643.8
34,315.8
± 1,050.8
35,686.0
± 1,022.0
35,895.3
± 1,085.2
Rangeland 18,558.5
± 577.3
17,890.7
± 583.0
17,493.4
± 567.3
17,859.4
± 588.6
18,229.0
± 844.1
18,453.4
± 1,024.4
18,636.5
± 1,066.8
Forest Land 42,270.4
± 465.6
42,627.6
± 520.2
42,968.8
± 491.7
43,897.3
± 532.4
45,067.4
± 956.1
45,605.7
± 1,150.3
45,867.9
± 1,220.1
Other Rural Land 5,648.5
± 141.3
5,746.9
± 143.4
5,904.5
± 170.2
6,135.4
± 171.1
6,275.1
± 188.7
6,694.4
± 372.0
6,875.5
± 420.4
Total Rural Land 329,337.7
± 1,866.7
327,390.0
± 1,892.5
324,925.9
± 1,733.1
321,761.5
± 1,767.6
318,903.2
± 1,871.9
316,742.1
± 1,962.4
315,925.1
± 2,025.2
Prime Farmland pie chart, see Prime Farmland, by Land Cover/Use table for data values
Notes:
• CRP was not implemented until 1985.
• Cropland includes cultivated and noncultivated cropland.

About the Data

Estimates presented here are based upon the latest information from the National Resources Inventory (NRI). The NRI is a longitudinal sample survey based upon scientific statistical principles and procedures. It is conducted by the U.S. Department of Agriculture’s Natural Resources Conservation Service (NRCS), in cooperation with Iowa State University’s Center for Survey Statistics and Methodology.

These results are based upon the 2010 NRI, which provides nationally consistent data for the 28-year period 1982–2010. Current estimates cover the contiguous 48 States, Hawaii, and the Caribbean Area.

Release of NRI results is guided by NRCS policy and is in accordance with OMB and USDA Quality of Information Guidelines developed in 2001. NRCS is releasing NRI estimates only when they meet statistical standards and are scientifically credible in accordance with these policies; also, measures of statistical uncertainty are provided for all 2010 NRI estimates released to the public.

The findings on land use come from the NRI data category "Land Cover/Use," which comprises mutually exclusive categories such as cropland, rangeland, forest land, other rural land, developed land, and water areas. The NRI uses this classification to account for every acre of non-Federal land within the Nation. Every parcel of land is described by one and only one of these categories.

The NRI approach to conducting inventories facilitates examining trends in rural and developed land uses over time because—

  • the same sample sites have been studied since 1982;
  • the same data have been collected since 1982 [definitions and protocols have remained the same];
  • the inventory accounts for 100 percent of the surface area;
  • quality assurance and statistical procedures are designed/developed to ensure that trend data are scientifically legitimate and unambiguous; and
  • it is easy to track lands as they go from one land-use category to another.

Irrespective of the scale of analysis, margins of error must be considered. Margins of error (at the 95 percent confidence level) are presented for all NRI estimates. Note that estimates of change between two points in time will be less precise (relatively) than estimates for a single inventory year because the changes will be occurring on a smaller fraction of the landscape.

Glossary

  • Land cover/use. A term that includes categories of land cover and categories of land use. Land cover is the vegetation or other kind of material that covers the land surface. Land use is the purpose of human activity on the land; it is usually, but not always, related to land cover. The NRI uses the term land cover/use to identify categories that account for all the surface area of the United States.
    • 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.
    • Conservation Reserve Program (CRP) land. A Land cover/use category that includes land under a CRP contract.
    • Developed land. A combination of land cover/use categories, Large urban and built-up areas, Small built-up areas, and Rural transportation land.
      • Urban and built-up areas. A Land cover/use category consisting of residential, industrial, commercial, and institutional land; construction sites; public administrative sites; railroad yards; cemeteries; airports; golf courses; sanitary landfills; sewage treatment plants; water control structures and spillways; other land used for such purposes; small parks (less than 10 acres) within urban and built-up areas; and highways, railroads, and other transportation facilities if they are surrounded by urban areas. Also included are tracts of less than 10 acres that do not meet the above definition but are completely surrounded by Urban and built-up land. Two size categories are recognized in the NRI: areas of 0.25 acre to 10 acres, and areas of at least 10 acres.
      • Large urban and built-up areas. A Land cover/use category composed of developed tracts of at least 10 acres—meeting the definition of Urban and built-up areas.
      • Small built-up areas. A Land cover/use category consisting of developed land units of 0.25 to 10 acres, which meet the definition of Urban and built-up areas.
      • Rural transportation land. A Land cover/use category which consists of all highways, roads, railroads and associated right-of-ways outside urban and built-up areas; also includes private roads to farmsteads or ranch headquarters, logging roads, and other private roads (field lanes are not included).
    • Forest land. A Land cover/use category that is at least 10 percent stocked by single-stemmed woody species of any size that will be at least 4 meters (13 feet) tall at maturity. Also included is land bearing evidence of natural regeneration of tree cover (cut over forest or abandoned farmland) and not currently developed for nonforest use. Ten percent stocked, when viewed from a vertical direction, equates to an areal canopy cover of leaves and branches of 25 percent or greater. The minimum area for classification as forest land is 1 acre, and the area must be at least 100 feet wide.
    • Pastureland. A Land cover/use category of land managed primarily for the production of introduced forage plants for livestock grazing. Pastureland cover 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.
    • 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.
    • Other rural land. A Land cover/use category that includes farmsteads and other farm structures, field windbreaks, barren land, and marshland.
    • Water areas. A Land cover/use category comprising water bodies and streams that are permanent open water.
  • Federal land. A land ownership category designating land that is owned by the Federal Government. It does not include, for example, trust lands administered by the Bureau of Indian Affairs or Tennessee Valley Authority (TVA) land. No data are collected for any year that land is in this ownership.
  • Prime farmland. Land that has the best combination of physical and chemical characteristics for producing food, feed, forage, fiber, and oilseed crops and is also available for these uses.
  • Margins of Error. Margins of error are reported for each NRI estimate. The margin of error is used to construct the 95 percent confidence interval for the estimate. The lower bound of the interval is obtained by subtracting the margin of error from the estimate; the upper bound is obtained by adding the margin of error to the estimate. Confidence intervals can be created for various levels of significance which is a measure of how certain we are that the interval contains the true value we are estimating. A 95 percent confidence interval means that in repeated samples from the same population, 95 percent of the time the true underlying population parameter will be contained within the lower and upper bounds of the interval.

For more definitions see the full 2010 NRI Glossary.

More Information

For more information about the NRI, visit http://www.nrcs.usda.gov/technical/NRI/

Send comments and questions to the NRI Help Desk

Citation for this website:
U.S. Department of Agriculture. 2014.
2010 National Resources Inventory.
Natural Resources Conservation Service, Washington, DC. 1 March 2014*
<http://www.nrcs.usda.gov/Internet/NRCS_RCA/reports/nri_nat.html>

*[use date the website was accessed]