APPENDIX C 



DEFINITIONS 



Land Area . The 1940 Census definition of land area excludes large 

 water areas that are more than 40 acres in size and streams more than 

 one-eighth of a mile wide. The 1964 Agricultural Census was used to 

 obtain land area by counties and adjustments were made to exclude res- 

 ervoirs over 40 acres in size that were constructed since the 1958 CNI 

 study. Land area was reduced by 34,144 acres. 



Inland water was excluded from land area in the State totals. It com- 

 prises 1,016,544 surface acres which is 34,144 acres more than shown in 

 1960 U. S. Department of Commerce report on area measurements for 

 Montana. It includes large bodies of water more than 40 acres in size 

 and streams more than one-eighth mile wide. 



Federal land . Includes all federally owned land except cropland oper- 

 ated under lease and Indian lands either owned by individuals or tribes 

 under trusteeship. The U. S. Forest Service and Bureau of Land Manage- 

 ment manage 94 percent of the federal lands in the State. Other federal 

 agencies include the Park Service, Bureau of Sport Fisheries and ..ild- 

 life, Agricultural Research Service, Army, Air Force, Corps of Civil 

 Engineers, Bureau of Reclamation, Bonneville Power, Veterans Administra- 

 tion and Migration Service. 



Urban and built-up areas . These lands include cities and towns and 

 other built-up areas of more than 10 acres such as highways, roads, 

 railroads, cemeteries, airports, golf courses, shooting ranges, indus- 

 trial sites (except for strip mines and borrow pits) and institutional 

 or public administrative sites. 



Small water areas . This includes water areas such as ponds, reservoirs 

 and lakes that are 2 to 40 acres in size and perennial streams less than 

 one-eighth mile wide. Where such waters occurred within federal owner- 

 ship, they were classed as federal land to prevent duplication. Small 

 islands less than 2 acres in size were repotted as water. 



Non-Inventory Acreage . Includes federal lands, urban and built-up areas 

 and small wa cer areas as defined. 



Inventory Acreage . The inventory acreage is the land area after the 

 exclusion of federal lands, urban and buiit-up areas and small water 

 areas. This is the acreage on which land use and treatment needs were 

 developed by the county committees based on expanded sample data and 

 the best estimates of the committees. 



Cropland . Includes all lands (irrigated and dry) in tillage rotation, 

 orchards and open land formerly cropped thac has not been converted to 



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