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Aerial Fire Retardant Hydrographic Avoidance Areas: Aquatic (Map Service)

posted on 2024-06-05, 12:42 authored by U.S. Forest Service
Aerial retardant avoidance area for hydrographic feature data are based on high resolution National Hydrographic Dataset (NHD) produced by USGS and available from the USFS. Forests and/or regions have had the opportunity to modify the default NHD water representation (300ft buffer from all water features) for their areas of interest to accurately represent aerial fire retardant avoidance areas as described in the 2011 Record of Decision for the Nationwide Aerial Application of Fire Retardant on National Forest System Land EIS. These changes have been integrated into this dataset depicting aerial fire retardant avoidance areas for hydrographic features. The following process was used to develop the hydrographic areas to be avoided by aerial fire retardant. Initially, all intermittent/ephemeral and perennial features were buffered by 300 feet by the Forest/Region units. Subsequently, Forest/Region units may have extended these buffers locally based on their requirements. There may be overlapping features that have been created during the buffering process, so one must dissolve features before calculating any area values. Data is symbolized by FCODE. Using the FCODE attribute, streams/rivers/waterbodies are categorized into perennial and intermittent/ephemeral types. Avoidance features (streams and rivers) with FCODES 46003 and 46007, as well as features (lakes and other waterbody) with FCODES 39001, 39005, 39006, 43614, 46601 are considered intermittent/ephemeral features. All other FCODES are considered to be perennial features. All underground and covered water features (e.g., pipelines) are excluded. When symbolizing this information, perennial features should be drawn on top of intermittent/ephemeral features to give the proper message. Data displays at scales larger than 1:1,250,000. Data uses a Web Mercator projection. The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee. Metadata and Downloads

This record was taken from the USDA Enterprise Data Inventory that feeds into the catalog. Data for this record includes the following resources:
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Data contact name


Data contact email


U.S. Forest Service


  • Geospatial

Geographic Coverage


ISO Topic Category

  • environment

National Agricultural Library Thesaurus terms

Forestry, Wildland Management

OMB Bureau Code

  • 005:96 - Forest Service

OMB Program Code

  • 005:059 - Management Activities

Pending citation

  • No

Public Access Level

  • Public

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