This data set depicts designated Areas of Critical Environmental Concern (ACECs) on public lands managed by the Bureau of Land Management. This dataset identifies designated Areas of Critcal Environmental Concern (ACECs) established through land use planning.
ACEC designations highlight areas where special management attention is needed to protect and prevent irreparable damage to important historic, cultural and scenic values, fish or wildlife resources, or other natural systems or processes, or to protect human life and safety from natural hazards. The ACEC designation indicates that BLM recognizes that an area has significant values and has established special management measures to protect those values.
Procedures used by Salt Lake BLM field office: The majority of arcs that are based on legal descriptions were either screened digitized and snapped to the Geographic Coordinate Database (GCDB) coverage or were selected from the GCDB coverage and "put" into the AOACEC coverage. Lines based on other features (roads, land status, plss) were selected from coverages and put into AOACEC. The Central Pacific Railroad Grade ACEC boundary was created by buffering roads and, in some cases, buffering the railroad grade that was screen digitized from digital ortho photos. Reviews Applied to Data: Data were reviewed in ArcInfo for positional accuracy. Boundaries that were coincident and vertically integrated with other features were reviewed for positional accuracy at scales of 1:600 or larger with the respective feature as a back coverage. Where legal land descriptions were available the digital data were verified by the GIS Coordinator and/or a BLM Realty Specialist by comparing ACEC boundaries with the legal descriptions. Related Spatial and Tabular Data Sets: aoacec_admin.rel, aoacec_reason.rel Notes: Although only public lands can actually be designated as ACECs, ACEC boundaries often include state and private lands that would be managed as part of the ACEC, if acquired by BLM in the future. These inclusive boundaries also facilitate planning. The western most boundary of the Central Pacific Railroad Grade ACEC was estimated at 100 feet northeasterly from what appears to be Engineer Station on the DOQ as per the description of the boundary. There is a discrepancy in the Donner Creek/Bettridge Creek ACEC Management Plan. The plan map shows 280 state acres, but 320 state acres are listed in the document. An internal working map of the ACEC was drawn with 320 acres. According to the SLFO Realty Specialist, Mike Nelson, and Environmental Specialist, Alice Stephenson, the plan map is in error. The correct boundary as represented by the GIS data was taken from the working map and includes 320 state acres. No legal description for this ACEC has been located. The Horseshoe Springs ACEC boundary is based on an internal working map. No legal description has been located. There is a discrepancy between the legal description and the planning document map of the Laketown ACEC boundary. According to the SLFO Realty Specialist, Mike Nelson, the legal description is in error. T 12 N, R 5 E, Section 26, N1/2 NW1/4 SW1/4 should be T 12 N, R 5 E, Section 26, S1/2 NW1/4 SW1/4. The Salt Wells ACEC boundary description is limited to township, range, and sections and number of acres within each section. The GIS Coordinator in conjunction with Mike Nelson, Reality Specialist, determined boundaries based on this information and the small scale map in the Box Elder Plan Amendment. The map and description are not detailed enough to guarentee the accuracy of the boundary in several of the partial sections.
publication date
This data should never be used at a scale larger than 1:24,000. The data and corresponding attributes are only as accurate as the source from which they were obtained, and may vary depending upon the date and method of acquisition. This data is suitable for regional planning, management decision support at intermediate scales, i.e. 1:24,000 or smaller, and cartographic purposes. The data is not suitable for purposes of navigation. This data is not suitable for analysis at scales larger than 1:24,000. If the Receiving Agency (RA) has modified the data in any way, they are obligated to describe the types of modifications they have performed on hardcopy maps utilizing the data. RA specifically agrees not to misrepresent USO data sets nor to imply that any changes made were approved by BLM USO. No warranty is made by the BLM for use of the data for purposes not intended by BLM. This information may be updated without notification.
2370 South 2300 West
GIS specialists in field office locations, prepared the original data sets. Some of these individuals include, Jo-Ann Stroh, Neil Simmons, Andrew Dubrasky, Mark Pearce, Jean Carson. Cheryl Johnson, GIS Coordinator; Tony Anderson, GIS Specialist; Katie Andrews, GIS Specialist; Review: Mike Nelson, Realty Specialist; Alice Stephenson, Environmental Specialist
Polygon topology is present. Data were checked to ensure there are no duplicate lines, dangle errors, or label errors and that all polygons are closed.
Polygon topology is present. Data were checked to ensure there are no duplicate lines, dangle errors, or label errors and that all polygons are closed.
Polygon topology is present. Data were checked to ensure there are no duplicate lines, dangle errors, or label errors and that all polygons are closed.
This data was prepared at, and is believed to be accurate, to the 1:24,000 scale. Data prepared at the Salt Lake Field Office: Where legal land descriptons were available the digital data were verified by the GIS Coordinator and/or a BLM Realty Specialist by comparing plots of ACEC boundaries and GCDB quarter quarter sections with the legal descriptions. Boundaries that were coincident and vertically integrated with other features were reviewed for positional accuracy in ArcInfo (ArcEdit) at 1:600 or larger with the respective feature as a back coverage. Detailed source information was not available in several cases. BLM SLFO Realty Specialists were consulted when there was a need to resolve conflicting information or when there was a lack of detailed information in the descriptions and maps. Overall accuracy for this data is not greater than national mapping accuracy standards (NMAS) for USGS source maps
This data was prepared at, and is believed to be accurate, to the 1:24,000 scale.
legal description and attributes
legal description and attributes
lines, total acreage, and attritutes
lines
legal description and attributes
total acreage and attributes
lines
Bonneville Salt Flats ACEC was screen digitized based the legal description using the Geographic Coordinate Database (GCDB) coverage as a back coverage and snapping to GCDB where coincident.
Metadata imported.
Blue Springs ACEC was screen digitized based on the legal description. The public land survey system (rspls_ut24) coverage was used as a back coverage. Lines were snapped to the plss coverage where coincident
Portions of the road (trrds_ut24) along the top of the Central Pacific Railroad Grade ACEC were selected and put into a new coverage. Where the road doglegs around washouts and no longer represents the center line of the ACEC it was "straightened out" by removing vertices. The road was buffered 200 feet each side to create the CPRG ACEC
The Donner Creek/Bettridge Creek ACEC was screen digitized using GCDB as a back coverage. The boundary was based on a graphic created by Lynn Roth, BLM, Utah State Office. The graphic is an approximation of the boundary based on a small scale map in the planning document. Lines were snapped to GCDB
An internal working map depicting the Horseshoe Springs ACEC was drawn by Alice Stephenson, Environmental Specialist, on 1:24,000 topographic maps based on the general location as represented in the planning document and the total number of acres. This representation was screen digitized using GCDB as a back coverage
The Laketown Canyon ACEC was screen digitized with GCDB as a back coverage. Lines were snapped to GCDB where coincident
The Salt Wells ACEC was screen digitized based on the sections given in the legal description and public land lines. The legal description does not break the sections down into aliquot parts, but does report total acreage per section designated as an ACEC. The GIS staff decided to include only public lands within the boundary where the ACEC was in partial sections. Rspls_ut24 was used as a back coverage
All ACEC coverages in the Salt Lake Field Office, were appended into one coverage, acec_all, in ArcInfo. Arcs and polygons were attributed according to the aoacec standard.
Where the road on the Central Pacific Railroad Grade veered off of the center line of the original grade the line of the grade was screen digitized using digital orthoquads (DOQs). These lines were buffered 60.96 meteres (200 feet) each side and were put into the acec_all coverage. Original line work was deleted in these areas (split, delete). The eastern most and western most ends of the ACEC were moved to more accurately represent the boundaries in the legal description. The western most boundary was approximated as beginning 100 feet east of Engineer Station
The boundaries of the Salt Wells ACEC were reviewed by the SLFO Realty Specialist, Mike Nelson, and boundary changes were recommended based on knowledge of the area. A road from trrds_ut24 was selected and put into acec_all to represent the northern boundary of Salt Wells ACEC. Boundary was adjusted to follow suggested aliquot parts in township 11 north, range 7 west, section 6 as it appears on small-scale RMP map. All lines were snapped to GCDB where coincident.
The Blue Springs ACEC boundary was vertically integrated with GCDB and the public land survey system (rspls_ut24). See feature level metadata. Section 30, township 10 north, range 4 west was excluded from the ACEC based on the legal description in the planning document.
Coverage renamed to aoacec. Metadata updated.
Changes to sections 16, 21, 26, and 29 of township 4 north, range 19 west were made to correctly represent boundaries. All data were vertically integrated with GCDB in ArcInfo
BLM field offices prepared data at 1:24,000 scale. An ArcInfo coverage for each of the following field offices was prepared--Richfield, Vernal, St. George, Kanab, Fillmore, Salt Lake, San Juan, and Price. The Utah State BLM office compiled the various data sets into one ArcInfo coverage. The new statewide coverage was made available for field office review.
324 South State Street
Metadata imported.
ACEC's for Fillmore and Moab Field offices were added to the data set.
Negro Bill Canyon has been removed.
Metadata imported.
Dataset copied.
Dataset copied.
Dataset copied.
Dataset copied.
Dataset copied.
Dataset copied.
Dataset copied.
Metadata imported.
Metadata imported.
Internal feature number.
ESRI
Feature geometry.
ESRI
The designed primary key that will uniquely identify a single occurrence of the entity. The primary key for ACEC will be 9 digits. The first four will be "ACEC" and the last five digits will be a sequential number. The ACEC identifier web page will provide the sequential number to use for the new ACEC.
BLM
The current identifier that was used by a state or field office to identify an ACEC at the state or field office level.
BLM
The name of the ACEC taken from the Record of Decision and Land Use Plan which officially designated the ACEC.
BLM
The number that refers to the serialized case file number of the group of official documents that record the facts, or actions taken, on a specific application, such as an oil and gas lease, exchange, airport lease, easement acquisition, etc. (CMR). This field should be in uppercase (for example, OR035582). This is a BLM International Organization for Standardization (ISO) assigned number used for identification of all lands and minerals case files including ACECs. This is the link to the LR2000 database. N/A - Not Applicable is the default code and will be used when no casefile number has been assigned. A value of "UNK" indicates unknown.
BLM
The name given to a project that represents the full, official name associated with the project.
BLM
The measure of the area estimated in the designation process for land use planning. This is the designated size (acres) and may be different than the actual area. This does not change. Acres are calculated using the following formula: [Acres = Area (in meters)/4046.87]. This may be different than the GIS calculated area of the ACEC polygon. This field value should be the same for each polygon in an ACEC comprised of multiple polygons. The values in this field do not change. Do not use this field to derive GIS acres.
BLM
The date on which the decision is signed by the person who has approval authority for the decisions. The ROD signing date of the monitoring or activity plan, if any, for the particular ACEC. The date will be in the format of MM/DD/YYYY.
BLM
This is a calculated value of area in units of acres based on the area field created by default within the ESRI Polygon data structure. For the purposes of a 'national data layer', the data are to be stored in geographic coordinates which do not correspond to ground values. This requires that there be a standard method for calculating this attribute. The method used for these data are as follows: The data are projected into a standard projection such as the ESRI default Albers projection for the continental United States, "US Albers NAD 1983." Once the data are projected, then a calculation of "SHAPE_Area (square meters) * 0.0002471044 = acres" is applied to the existing 'area' field that is default area created by the ESRI software resulting in the field (Attribute) 'SHAPE_Area'. Please note that the figure used in this calculation is the factor for converting the US Survey Foot value of for the length of a meter as opposed to the International Standard for converting meters and feet.
BLM
An administrative unit that identifies the state or geographic area which has administrative jurisdiction over lands, and cases, although the land for a case may not be physically located in a state. Only those states that are BLM administrative states are in the domain for this entity. Example: Montana is the Administrative State for public lands in the geographic States of Montana, South and North Dakota. A two letter, upper case abbreviation for the administrative state office. Attribute Domain Assignment: DOM_ADMIN_ST Default: XX
BLM
The second level of BLM administrative units that identifies the state or geographic area which has administrative jurisdiction over lands. A District Office reports to an Administrative State Office. This is a two digit code designating the second administrative layer down from a state office.
BLM
The smallest BLM administrative unit that identifies the state or geographic area which has administrative jurisdiction over lands. A Field Office reports to a District Office. The smallest BLM administrative unit that identifies the state or geographic area which has administrative jurisdiction over lands. A Field Office reports to a District Office.
BLM
A BLM code for the individual office that is responsible for the administration of the ACEC. This represents a concatenation of the values for State Office Code, District Office Code, and Field Office Code, if applicable. The value for this field can be obtained using the Field Calculator in ArcMap ([ADMIN_OFF] = [admin_st] + [admin_do] + [admin_fo]). Note: If the value for any one of the 3 office codes is changed, the ADMIN_OFF values must be updated by running the Field Calculator function again.
BLM
A code that designates the sensitivity of the information on the ACEC. Attribute Domain Assignment: DOM_SEN_CODE Default: UNK
BLM
The text that provides additional information about the Area of Critical Environmental Concern.
BLM
Length of feature in internal units.
ESRI
Area of feature in internal units squared.
ESRI
BLM provides this data as is, without liability. No warranty is made by the BLM for use of the data for purposes not intended by BLM.
A copy of this data can be placed on the BLM ftp site for retrieval. Contact Maggie Kelsey 801 539-4068 or Carla Garrison 801 539-4146.
440 West 200 South , Suite 500