Broad Land Cover/Use Acreage Summary for All Years

Willamette - 1 7 0 9 0 0
6 Digit Hydrologic Unit Code (HUC) Area
Oregon National Resources Inventory Results

See Details Page for further explanations.
See National NRI Glossary for complete definitions.

Cultivated Cropland

1982 Cultivated Cropland.
Estimate = 908,400 acres.
Error = 55,400 acres.

1987 Cultivated Cropland.
Estimate = 872,900 acres.
Error = 53,500 acres.

1992 Cultivated Cropland.
Estimate = 874,400 acres.
Error = 54,400 acres.

1997 Cultivated Cropland.
Estimate = 862,400 acres.
Error = 53,400 acres.
 

Non-Cultivated Cropland

1982 Non-Cultivated Cropland.
Estimate = 168,700 acres.
Error = 18,700 acres.

1987 Non-Cultivated Cropland.
Estimate = 183,700 acres.
Error = 19,000 acres.

1992 Non-Cultivated Cropland.
Estimate = 154,200 acres.
Error = 18,100 acres.

1997 Non-Cultivated Cropland.
Estimate = 161,200 acres.
Error = 18,600 acres.
 

Conservation Reserve Program (CRP) Land

Standard error estimates for CRP are not comparable with other data due to computational differences, and will not be shown.

1982 CRP Estimate = No Data, since the program was established under the Food Security Act of 1985.

1987 CRP Estimate = 1,700 acres.

1992 CRP Estimate = 2,500 acres.

1997 CRP Estimate = 800 acres.
 

Pastureland

1982 Pastureland.
Estimate = 499,200 acres.
Error = 41,500 acres.

1987 Pastureland.
Estimate = 459,400 acres.
Error = 40,500 acres.

1992 Pastureland.
Estimate = 463,400 acres.
Error = 41,800 acres.

1997 Pastureland.
Estimate = 404,200 acres.
Error = 39,800 acres.
 

Rangeland

The 1982 rangeland estimate of 1,000 acres us the result of a data base error.  The value should be zero, because there is no rangeland in this geographic area.

1982 Rangeland.
Estimate = 1,000 acres.
Error = 1,000 acres.

1987 Rangeland.
Estimate = 0 acres.
Error = 0 acres.

1992 Rangeland.
Estimate = 0 acres.
Error = 0 acres.

1997 Rangeland.
Estimate = 0 acres.
Error = 0 acres.
 

Forestland

1982 Forestland.
Estimate = 2,638,900 acres.
Error = 103,300 acres.

1987 Forestland.
Estimate = 2,653,900 acres.
Error = 101,700 acres.

1992 Forestland.
Estimate = 2,639,200 acres.
Error = 101,700 acres.

1997 Forestland.
Estimate = 2,611,900 acres.
Error = 102,100 acres.
 

Federal Land

Standard error estimates for federal land are not comparable with other data due to computational differences, and will not be shown.

1982 Federal Land Estimate = 2,538,300 acres.

1987 Federal Land Estimate = 2,542,400 acres.

1992 Federal Land Estimate = 2,532,400 acres.

1997 Federal Land Estimate = 2,532,400 acres.
 

Other Rural Lands

1982 Other Rural Lands.
Estimate = 109,300 acres.
Error = 18,200 acres.

1987 Other Rural Lands.
Estimate = 114,700 acres.
Error = 18,300 acres.

1992 Other Rural Lands.
Estimate = 125,200 acres.
Error = 19,600 acres.

1997 Other Rural Lands.
Estimate = 160,100 acres.
Error = 21,300 acres.
 

Urban Lands

1982 Urban Lands.
Estimate = 335,800 acres.
Error = 34,800 acres.

1987 Urban Lands.
Estimate = 370,300 acres.
Error = 36,100 acres.

1992 Urban Lands.
Estimate = 409,100 acres.
Error = 38,800 acres.

1997 Urban Lands.
Estimate = 465,300 acres.
Error = 40,800 acres.
 

Rural Transportation

1982 Rural Transportation.
Estimate = 88,400 acres.
Error = 3,900 acres.

1987 Rural Transportation.
Estimate = 88,100 acres.
Error = 3,900 acres.

1992 Rural Transportation.
Estimate = 87,000 acres.
Error = 3,800 acres.

1997 Rural Transportation.
Estimate = 88,800 acres.
Error = 4,700 acres.
 

Small Water

1982 Small Water.
Estimate = 45,700 acres.
Error = 3,800 acres.

1987 Small Water.
Estimate = 46,600 acres.
Error = 3,800 acres.

1992 Small Water.
Estimate = 46,300 acres.
Error = 3,800 acres.

1997 Small Water.
Estimate = 46,600 acres.
Error = 3,800 acres.
 

Large Water

Standard error estimates for large water are not comparable with other data due to computational differences, and will not be shown.

1982 Large Water Estimate = 51,800 acres.

1987 Large Water Estimate = 51,800 acres.

1992 Large Water Estimate = 51,800 acres.

1997 Large Water Estimate = 51,800 acres.
 

Total Land Acreage for all years 1982, 1987, 1992, and 1997.
Estimate = 7,385,500 acres.
Standard error estimate for Total is not comparable with other data due to computational differences, and will not be shown.

NOTE: Data may not add to totals because of rounding. The error referred to in the table is the standard error of the estimate. You can obtain the margin of error at the 95% confidence limit by multiplying the error by 1.96.  Standard errors greater than 50% of the estimate indicate a low level of statistical reliability.

Send comments and suggestions to the Oregon Resources Inventory Team
Last Modification: Tuesday, July 08, 2003

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