EnviroAtlas - Road Density Metrics by 12-digit HUC for the Conterminous United States

This EnviroAtlas dataset describes several metrics related to road-stream crossings and roads near streams at the watershed scale. According to EPA report 600/R-97/130, roads can affect stream water in many ways and roads in close proximity to streams have the most potential for adverse effects on stream water quality. Since roads have an impervious surface, and ditches are built to channel water from roads into streams, the rate of water runoff is higher where there are more roads. Not only does this lead to increased scour of the river channel and stream banks, but it can also be a preferential pathway for runoff associated with road salting or routine maintenance which, along with other spills on the roadway, can lead to overall reductions in water quality. This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets).

Data and Resources

Field Value
access_constraints ["Use Constraints: None. Please check sources, scale, accuracy, currency and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated.", "Access Constraints: None"]
bbox-east-long -65.20336449
bbox-north-lat 51.6773602
bbox-south-lat 22.7348894
bbox-west-long -128.02839229
contact-email EnviroAtlas@epa.gov
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2017-06-14"}]
frequency-of-update asNeeded
licence ["https://edg.epa.gov/EPA_Data_License.html"]
licence_url https://edg.epa.gov/EPA_Data_License.html
metadata-date 2020-10-16
metadata-language eng; USA
metadata_type geospatial
progress completed
resource-type dataset
responsible-party [{"name": "U.S. Environmental Protection Agency, Office of Research and Development-Sustainable and Healthy Communities Research Program, EnviroAtlas", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-128.02839229, 22.7348894], [-65.20336449, 22.7348894], [-65.20336449, 51.6773602], [-128.02839229, 51.6773602], [-128.02839229, 22.7348894]]]}
spatial_harvester true
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • 12-digit-hucs
  • alabama
  • amerigeo
  • amerigeoss
  • arizona
  • arkansas
  • california
  • ckan
  • colorado
  • connecticut
  • delaware
  • ecosystem
  • ecosystem-services
  • enviroatlas
  • environment
  • environmental-atlas
  • florida
  • geo
  • georgia
  • geoss
  • idaho
  • illinois
  • indiana
  • iowa
  • kansas
  • kentucky
  • louisiana
  • maine
  • maryland
  • massachusetts
  • michigan
  • minnesota
  • mississippi
  • missouri
  • montana
  • national
  • nebraska
  • nevada
  • new-hampshire
  • new-jersey
  • new-mexico
  • new-york
  • north-america
  • north-carolina
  • north-dakota
  • ohio
  • oklahoma
  • oregon
  • pennsylvania
  • rhode-island
  • south-carolina
  • south-dakota
  • surface-water
  • tennessee
  • texas
  • transportation
  • united-states
  • utah
  • vermont
  • virginia
  • washington
  • washington-dc
  • water
  • west-virginia
  • wisconsin
  • wyoming
isopen False
metadata_created 2025-11-21T16:01:06.289553
metadata_modified 2025-11-21T16:01:06.289557
notes This EnviroAtlas dataset describes several metrics related to road-stream crossings and roads near streams at the watershed scale. According to EPA report 600/R-97/130, roads can affect stream water in many ways and roads in close proximity to streams have the most potential for adverse effects on stream water quality. Since roads have an impervious surface, and ditches are built to channel water from roads into streams, the rate of water runoff is higher where there are more roads. Not only does this lead to increased scour of the river channel and stream banks, but it can also be a preferential pathway for runoff associated with road salting or routine maintenance which, along with other spills on the roadway, can lead to overall reductions in water quality. This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets).
num_resources 4
num_tags 66
title EnviroAtlas - Road Density Metrics by 12-digit HUC for the Conterminous United States